CN110751398A - Regional ecological quality evaluation method and device - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 58
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Abstract
The invention discloses a regional ecological quality evaluation method and a device, and the method obtains index values of all evaluation indexes of a region to be evaluated according to preset evaluation elements and evaluation indexes contained in the evaluation elements. The evaluation elements include water elements, gas elements, soil elements, biogenic elements, and disaster elements. And (4) standardizing the index values of all the evaluation indexes to form dimensionless indexes. The ecological environment comprehensive evaluation index value of the area to be evaluated is calculated, the ecological environment quality grade of the area to be evaluated is output according to the preset corresponding relation between the ecological environment comprehensive evaluation index value and the ecological environment quality grade, an evaluation index system is established from the aspects of water, gas, soil, life and disaster, regional ecological quality evaluation is carried out on the basis, the method has strong comprehensive dynamic evaluation capability, the stability and the universality of the method are high, and the method is particularly suitable for ecological quality dynamic evaluation of ecological fragile areas.
Description
Technical Field
The invention relates to the technical field of ecological environment, in particular to a regional ecological quality evaluation method and device.
Background
At present, various methods for evaluating regional ecological quality are available, such as a principal component analysis method, a cluster analysis method, a distance discrimination method, a fuzzy mathematical evaluation method, a grey system evaluation method, a matter element analysis method, an analytic hierarchy process and the like. In comparison, the analytic hierarchy process has the characteristics of high logicality, systematicness, flexibility and practicability, and is mature, so that the analytic hierarchy process becomes one of the mainstream methods for regional ecological quality evaluation.
The basic idea of the analytic hierarchy process is to consider the problem under study as a large system, to analyze a plurality of factors of the system to divide ordered levels of mutual connection among the factors, then to objectively judge each factor of each level, to establish a corresponding evaluation index system, to give a weighted value of relative importance of all factors of each level, to order, and finally to make planning decision and select measures for solving the problem according to the ordering result. Among them, the construction of the evaluation index system is a key problem.
In the regional ecological quality evaluation work, the traditional analytic hierarchy process selects an evaluation index system which is complex, and some indexes are difficult to collect or difficult to obtain, so that the dynamic evaluation of the regional ecological quality condition is directly restricted; meanwhile, when the evaluation method selects the evaluation index, the consideration of specific ecological environment conditions, such as the ubiquitous ecological conditions in ecological fragile areas, is lacked. The ecological fragile area generally has the problems of soil impoverishment, serious water and soil loss or desertification, frequent disasters, sparse vegetation or low vegetation function and the like, and the ecological environment condition is not optimistic on the whole. Therefore, the traditional analytic hierarchy process has weak comprehensive dynamic evaluation capability and low stability and universality.
Disclosure of Invention
The invention provides a regional ecological quality evaluation method and a device, which are used for solving the problems of weak comprehensive dynamic evaluation capability and low stability and universality of the traditional development of regional ecological quality evaluation method based on an analytic hierarchy process.
In a first aspect, the present invention provides a regional ecological quality evaluation method, including:
acquiring index values of all evaluation indexes of an area to be evaluated according to preset evaluation elements and the evaluation indexes contained in the evaluation elements, wherein the preset evaluation elements comprise water elements, gas elements, soil elements, biological elements and disaster elements;
standardizing the index values of the evaluation indexes to form dimensionless indexes;
according to CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiThe index of the ith evaluation index of the area to be evaluated;
and outputting the ecological environment quality grade of the area to be evaluated according to the preset corresponding relation between the ecological environment comprehensive evaluation index value and the ecological environment quality grade.
With reference to the first aspect, in a first implementable manner of the first aspect, the evaluation index included in the water element includes: the method comprises the following steps of standardizing index values of all evaluation indexes to form dimensionless indexes, wherein the index values comprise the following steps:
determining an index of the surface water body area according to the ratio of the water body area of the area to be evaluated to the total area of the area to be evaluated;
according toAnd calculating an index of the surface groundwater level, wherein the groundwater level index refers to the index of the surface groundwater level of the area to be evaluated, the historical lowest water level refers to the historical lowest value of the surface groundwater level of the area to be evaluated, the actual water level refers to the actual value of the surface groundwater level of the area to be evaluated, and the historical highest water level refers to the historical highest value of the surface groundwater level of the area to be evaluated.
With reference to the first aspect, in a second implementation form of the first aspect, the evaluation index included in the gas element includes: the method comprises the following steps of (1) carrying out wetting index and atmospheric dust fall, and carrying out standardization treatment on index values of all evaluation indexes to form dimensionless indexes, wherein the dimensionless indexes comprise:
judging whether the wetting index is larger than 1;
determining the wetting index to be 1 if the wetting index is > 1;
if the wetting index is less than or equal to 1, determining the wetting index as an actual value of the wetting index;
and determining the index of the atmospheric dust fall according to the atmospheric dust fall quantity saving and controlling standard of the area to be evaluated.
With reference to the second implementable manner of the first aspect, in a third implementable manner of the first aspect, the wetness index is a ratio of a precipitation amount to a potential evaporation amount.
With reference to the first aspect, in a fourth implementable aspect of the first aspect, the evaluation index included in the soil element includes: performing standardization treatment on the index values of the evaluation indexes to form dimensionless indexes, wherein the dimensionless indexes comprise:
determining according to the second provisional technical rule of soil general survey, and determining the index of soil nutrients in the area to be evaluated;
and determining the index of the soil desertification of the area to be evaluated according to the vegetation coverage ratio of the area to be evaluated.
With reference to the fourth implementable manner of the first aspect, in a fifth implementable manner of the first aspect, the soil nutrients include 4 factors of organic matter, total nitrogen, total phosphorus, and total potassium in soil with a soil surface layer of 0-40 cm.
With reference to the first aspect, in a sixth implementable manner of the first aspect, the evaluation index included in the raw element includes: the method comprises the following steps of standardizing index values of all evaluation indexes to form dimensionless indexes, wherein the index values comprise the following steps:
according to
And calculating a net first productivity index of the vegetation, wherein the historical maximum value refers to the historical maximum value of the vegetation productivity of the area to be evaluated, the historical minimum value refers to the historical minimum value of the vegetation productivity of the area to be evaluated, and the actual value refers to the actual value of the vegetation productivity of the area to be evaluated.
With reference to the first aspect, in a seventh implementable aspect of the first aspect, the evaluation index included in the disaster element includes: frequently occurring meteorological disasters, and performing standardization processing on the index values of the evaluation indexes to form dimensionless indexes, wherein the dimensionless indexes comprise:
and determining the index of the frequent meteorological disasters according to the ratio of the area of the frequent meteorological disasters in the area to be evaluated to the area of the area to be evaluated.
With reference to the first aspect, in an eighth implementable manner of the first aspect, according to CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiThe step of the index of the ith evaluation index of the area to be evaluated comprises the following steps:
the weights of the water element, the gas element, the soil element, the birth element, and the disaster element are determined by an expert scoring method in advance, and then the weight of the evaluation index included in each evaluation element is determined by the expert scoring method in sequence.
In a second aspect, the present invention further provides a regional ecological quality evaluation device, including:
the device comprises an acquisition unit, a storage unit and a processing unit, wherein the acquisition unit is used for acquiring index values of various evaluation indexes of an area to be evaluated according to preset evaluation elements and the evaluation indexes contained in the evaluation elements, and the preset evaluation elements comprise water elements, gas elements, soil elements, biological elements and disaster elements;
the processing unit is used for carrying out standardization processing on the index values of the evaluation indexes to form dimensionless indexes;
a computing unit for computing based onCE＝∑Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiThe index of the ith evaluation index of the area to be evaluated;
and the output unit is used for outputting the ecological environment quality grade of the area to be evaluated according to the preset corresponding relation between the ecological environment comprehensive evaluation index value and the ecological environment quality grade.
The invention has the following beneficial effects:
according to the regional ecological quality evaluation method and device provided by the invention, an evaluation index system is established from the perspective of water, gas, soil, life and disaster, regional ecological quality evaluation is developed on the basis, the method has strong comprehensive dynamic evaluation capability, the stability and the universality of the method are high, and the method and device are particularly suitable for ecological quality dynamic evaluation in ecological fragile areas.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a flowchart of a regional ecological quality evaluation method according to an embodiment of the present invention.
Fig. 2 is a diagram of the evaluation result of land desertification in Jianping county in 2007.
Fig. 3 is a graph of the evaluation result of land desertification in 2014, Jianping county.
Fig. 4 is a schematic diagram of a regional ecological quality evaluation device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, in order to provide a regional ecological quality evaluation method according to an embodiment of the present invention, an execution subject of the method may be a processor, and the method includes:
step S101, acquiring index values of all evaluation indexes of an area to be evaluated according to preset evaluation elements and the evaluation indexes contained in the evaluation elements, wherein the preset evaluation elements comprise water elements, gas elements, soil elements, biological elements and disaster elements.
In regional ecological quality evaluation, selection of evaluation indexes is important. The method comprehensively considers relevant elements of the ecological environment of the affected area from the aspects of water, gas, soil, life and disaster of the ecological quality condition of the affected area, considers representativeness, easy acquireability and renewability of the selected indexes, and determines an evaluation index system.
In this embodiment, the evaluation index included in the water element may include: surface water volume area and surface groundwater level. Surface water body selection can include rivers, lakes, reservoirs, ponds, and the like. The evaluation index included in the gas element may include: and the wetting index is the ratio of the precipitation to the potential evapotranspiration, and can comprehensively reflect the hydrothermal condition. The evaluation index included in the soil element may include: soil nutrients and land desertification, wherein the soil nutrients can be 4 factors of soil organic matters, total nitrogen, total phosphorus and total potassium with the surface layer of 0-40 cm. The evaluation index included in the raw element may include: vegetation coverage and net primary productivity of vegetation, the evaluation index included in the disaster element may include: frequent meteorological disasters.
The surface water area data can be derived from the remote sensing image machine interpretation result, and the surface groundwater bit data can be derived from water conservancy and meteorological data networks. Precipitation, potential evapotranspiration, and atmospheric dustfall data may be derived from a meteorological data network. The soil nutrient data can be from a Chinese soil database, and the land desertification data can be from the extraction result based on the remote sensing image data. The vegetation coverage and vegetation productivity data may be derived from the remote sensing data interpretation. The disaster data may originate from a weather website.
And step S102, carrying out standardization processing on the index values of the evaluation indexes to form dimensionless indexes.
In this embodiment, the index of the surface water area may be determined according to a ratio of the water area of the region to be evaluated to the total area of the region to be evaluated. According to
And calculating an index of the surface groundwater level, wherein the groundwater level index refers to the index of the surface groundwater level of the area to be evaluated, the historical lowest water level refers to the historical lowest value of the surface groundwater level of the area to be evaluated, the actual water level refers to the actual value of the surface groundwater level of the area to be evaluated, and the historical highest water level refers to the historical highest value of the surface groundwater level of the area to be evaluated.
For example, the highest groundwater level in the area to be evaluated in 1981-2010 is 1.2 meters, and the lowest historical groundwater level is 3.1 meters (note: since the measurement of the groundwater level is measured by the distance between the groundwater level and the ground surface, the greater the distance, the lower the groundwater level, and the smaller the distance from the ground surface, the higher the groundwater level), the evaluation year is 2014, and the groundwater level index is 2.8 meters in the year, the groundwater level index is (3.1-2.8)/(3.1-1.2) is 0.33.
In this embodiment, it is determined whether the wetness index is greater than 1, and if the wetness index is greater than 1, the wetness index is determined to be 1; and if the wetting index is less than or equal to 1, determining the wetting index as an actual value of the wetting index. And determining the index of the atmospheric dust fall according to the atmospheric dust fall quantity saving and controlling standard of the area to be evaluated.
In this embodiment, the index of soil nutrients in the area to be evaluated may be determined according to the second provisional soil screening technical specification, and the index of soil desertification in the area to be evaluated may be determined according to the vegetation coverage ratio of the area to be evaluated.
In this embodiment, the method can be as follows
And calculating a net first productivity index of the vegetation, wherein the historical maximum value refers to the historical maximum value of the vegetation productivity of the area to be evaluated, the historical minimum value refers to the historical minimum value of the vegetation productivity of the area to be evaluated, and the actual value refers to the actual value of the vegetation productivity of the area to be evaluated.
For example, in the area to be evaluated 1981-2010, the maximum value of the vegetation productivity is 1500 g.m-2. a-1, the minimum value is 1200 g.m-2. a-1, the evaluation year is 2014, and the vegetation productivity in the current year is 1300 g.m-2. a-1, so that the vegetation productivity index is (1500-1300)/(1500-1200) to 0.67.
In this embodiment, the index of the frequent meteorological disasters is determined according to the ratio of the area of the frequent meteorological disasters in the area to be evaluated to the area of the area to be evaluated.
Step S103, according to CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiIs the index of the ith evaluation index of the area to be evaluated.
In the present embodiment, the respective weights of the water element, the gas element, the soil element, the biological element, and the disaster element may be determined by an expert scoring method in advance, and then the weight of the evaluation index included in each evaluation element may be determined by the expert scoring method in sequence. Further, the negative index may be subjected to a positive conversion process (1-negative index).
And step S104, outputting the ecological environment quality grade of the area to be evaluated according to the preset corresponding relation between the ecological environment comprehensive evaluation index value and the ecological environment quality grade.
In this example, the quality of the ecological environment can be classified into 5 grades, i.e., excellent, good, normal, poor, and bad.
Fig. 2 and fig. 3 show the comparison results of land desertification in 2007 and 2014, which are obtained by taking Jianping county in arid-semiarid ecological transition region in western Liaoning as an example, and taking the Jianping county as the region to be evaluated.
According to the technical scheme, the regional ecological quality evaluation method is developed from the perspective of water, gas, soil, life and disaster aiming at realizing dynamic monitoring and evaluation of regional ecological quality, especially dynamic monitoring and evaluation of ecological quality in ecological fragile areas by using easily-obtained data information aiming at overcoming the defects of the traditional regional ecological quality evaluation based on an analytic hierarchy process.
Referring to fig. 4, the present invention provides a regional ecological quality evaluation apparatus, which can be used to implement the above-mentioned regional ecological quality evaluation method, and each unit of the apparatus corresponds to the steps of the above-mentioned regional ecological quality evaluation method one by one. The apparatus may include:
an obtaining unit 401 is configured to obtain index values of each evaluation index of the area to be evaluated according to predetermined evaluation elements and the evaluation indexes included in the evaluation elements, where the predetermined evaluation elements include a water element, a gas element, a soil element, a biological element, and a disaster element.
A processing unit 402, configured to perform normalization processing on the index values of the evaluation indexes to form a dimensionless index.
Accordingly, the processing unit 402 may be configured to: and determining the index of the surface water body area according to the ratio of the water body area of the area to be evaluated to the total area of the area to be evaluated. According toCalculating the index of the surface groundwater level, wherein the groundwater level index refers to the index of the surface groundwater level of the area to be evaluated, the historical lowest water level refers to the historical lowest value of the surface groundwater level of the area to be evaluated, the actual water level refers to the actual value of the surface groundwater level of the area to be evaluated, and the historical highest water level refers to the surface groundwater level of the area to be evaluatedHistorical maximum of water level. Determining whether the wetness index is greater than 1. If the wetting index > 1, the wetting index is determined to be 1. And if the wetting index is less than or equal to 1, determining the wetting index as an actual value of the wetting index. And determining the index of the atmospheric dust fall according to the atmospheric dust fall quantity saving and controlling standard of the area to be evaluated. And determining the index of the soil nutrients in the area to be evaluated according to the second provisional technical specification of the soil general survey. And determining the index of the soil desertification of the area to be evaluated according to the vegetation coverage ratio of the area to be evaluated. According to
And calculating a net first productivity index of the vegetation, wherein the historical maximum value refers to the historical maximum value of the vegetation productivity of the area to be evaluated, the historical minimum value refers to the historical minimum value of the vegetation productivity of the area to be evaluated, and the actual value refers to the actual value of the vegetation productivity of the area to be evaluated. And determining the index of the frequent meteorological disasters according to the ratio of the area of the frequent meteorological disasters in the area to be evaluated to the area of the area to be evaluated.
A calculating unit 403 for calculating according to CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiIs the index of the ith evaluation index of the area to be evaluated. The weights of the water element, the gas element, the soil element, the birth element, and the disaster element are determined by an expert scoring method in advance, and then the weight of the evaluation index included in each evaluation element is determined by the expert scoring method in sequence. Further, the negative index may be subjected to a positive conversion process (1-negative index).
And the output unit 404 is configured to output the ecological environment quality level of the area to be evaluated according to a preset corresponding relationship between the ecological environment comprehensive evaluation index value and the ecological environment quality level. The quality of the ecological environment can be classified into 5 grades, i.e. excellent, good, general, poor and bad.
The embodiment of the present invention further provides a storage medium, and the storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements part or all of the steps in each embodiment of the regional ecological quality evaluation method provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. Particularly, for the embodiment of the regional ecological quality evaluation device, since the embodiment is basically similar to the embodiment of the method, the description is simple, and the relevant points can be referred to the description in the embodiment of the method.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (10)
1. A regional ecological quality evaluation method is characterized by comprising the following steps:
acquiring index values of all evaluation indexes of an area to be evaluated according to preset evaluation elements and the evaluation indexes contained in the evaluation elements, wherein the preset evaluation elements comprise water elements, gas elements, soil elements, biological elements and disaster elements;
standardizing the index values of the evaluation indexes to form dimensionless indexes;
according to CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiThe index of the ith evaluation index of the area to be evaluated;
and outputting the ecological environment quality grade of the area to be evaluated according to the preset corresponding relation between the ecological environment comprehensive evaluation index value and the ecological environment quality grade.
2. The method according to claim 1, wherein the evaluation index included in the water element includes: the method comprises the following steps of standardizing index values of all evaluation indexes to form dimensionless indexes, wherein the index values comprise the following steps:
determining an index of the surface water body area according to the ratio of the water body area of the area to be evaluated to the total area of the area to be evaluated;
according to
And calculating an index of the surface groundwater level, wherein the groundwater level index refers to the index of the surface groundwater level of the area to be evaluated, the historical lowest water level refers to the historical lowest value of the surface groundwater level of the area to be evaluated, the actual water level refers to the actual value of the surface groundwater level of the area to be evaluated, and the historical highest water level refers to the historical highest value of the surface groundwater level of the area to be evaluated.
3. The method according to claim 1, wherein the evaluation index included in the gas component includes: the method comprises the following steps of (1) carrying out wetting index and atmospheric dust fall, and carrying out standardization treatment on index values of all evaluation indexes to form dimensionless indexes, wherein the dimensionless indexes comprise:
judging whether the wetting index is larger than 1;
determining the wetting index to be 1 if the wetting index is > 1;
if the wetting index is less than or equal to 1, determining the wetting index as an actual value of the wetting index;
and determining the index of the atmospheric dust fall according to the atmospheric dust fall quantity saving and controlling standard of the area to be evaluated.
4. The method of claim 3, wherein the wetting index is a ratio of precipitation to potential evapotranspiration.
5. The method according to claim 1, wherein the evaluation index included in the soil element includes: performing standardization treatment on the index values of the evaluation indexes to form dimensionless indexes, wherein the dimensionless indexes comprise:
determining according to the second provisional technical rule of soil general survey, and determining the index of soil nutrients in the area to be evaluated;
and determining the index of the soil desertification of the area to be evaluated according to the vegetation coverage ratio of the area to be evaluated.
6. The method of claim 5, wherein the soil nutrients comprise 4 factors of total nitrogen, total phosphorus and total potassium in the organic matter of 0-40 cm soil on the surface layer of the soil.
7. The method according to claim 1, wherein the evaluation index included in the raw element includes: the method comprises the following steps of standardizing index values of all evaluation indexes to form dimensionless indexes, wherein the index values comprise the following steps:
according to
Calculating a net first productivity index of the vegetation, wherein the maximum historical value refers to the maximum historical productivity of the vegetation in the area to be evaluated, the minimum historical value refers to the minimum historical productivity of the vegetation in the area to be evaluated, and the actual value refers to the actual value of the productivity of the vegetation in the area to be evaluated。
8. The method according to claim 1, wherein the evaluation index included in the disaster element includes: frequently occurring meteorological disasters, and performing standardization processing on the index values of the evaluation indexes to form dimensionless indexes, wherein the dimensionless indexes comprise:
and determining the index of the frequent meteorological disasters according to the ratio of the area of the frequent meteorological disasters in the area to be evaluated to the area of the area to be evaluated.
9. The method of claim 1, wherein the method is based on CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiIs the weight value of the ith evaluation index of the area to be evaluated, IiThe step of the index of the ith evaluation index of the area to be evaluated comprises the following steps:
the weights of the water element, the gas element, the soil element, the birth element, and the disaster element are determined by an expert scoring method in advance, and then the weight of the evaluation index included in each evaluation element is determined by the expert scoring method in sequence.
10. A regional ecological quality evaluation device is characterized by comprising:
the device comprises an acquisition unit, a storage unit and a processing unit, wherein the acquisition unit is used for acquiring index values of various evaluation indexes of an area to be evaluated according to preset evaluation elements and the evaluation indexes contained in the evaluation elements, and the preset evaluation elements comprise water elements, gas elements, soil elements, biological elements and disaster elements;
the processing unit is used for carrying out standardization processing on the index values of the evaluation indexes to form dimensionless indexes;
a calculation unit for calculating a difference according to CE ═ Σ Wi×IiCalculating the ecological environment comprehensive evaluation index value of the area to be evaluated, wherein CE is the ecological environment comprehensive evaluation index value of the area to be evaluated, WiTo be evaluatedWeighted value of I-th evaluation index of region, IiThe index of the ith evaluation index of the area to be evaluated;
and the output unit is used for outputting the ecological environment quality grade of the area to be evaluated according to the preset corresponding relation between the ecological environment comprehensive evaluation index value and the ecological environment quality grade.
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