CN113222222A - Method for measuring invasion risk of foreign species in grass sea wetland - Google Patents
Method for measuring invasion risk of foreign species in grass sea wetland Download PDFInfo
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Abstract
The invention belongs to the technical field of foreign species invasion risk assessment, and discloses a grass sea wetland foreign species invasion risk determination method, which comprises the following steps: acquiring alligator alternanthera data and reed data; evaluating the invasion risk of dominant plants of the grass sea wetland; evaluating the invasion risk of the invasive plants of the grass sea wetland; constructing a grass sea wetland invasive plant early warning system; establishing an evaluation standard of the ecological risk of grass sea species invasion; and (4) processing data by adopting a simple calculation method. According to the method, a biological invasion risk evaluation index system is established, a typical external invasion species of alligator alternanthera and reed which forms dominant species at present are selected as evaluation objects, the diffusion risk is evaluated through a diffusion risk value, and the diffusion risk of the external invasion species is accurately analyzed. Meanwhile, the invention provides a certain guarantee for ensuring the species diversity of the indigenous organisms, is one of the most effective means for preventing the invasion of foreign species, and has great significance for protecting the species diversity of China.
Description
Technical Field
The invention belongs to the technical field of foreign species invasion risk assessment, and particularly relates to a method for determining the invasion risk of foreign species in a grass sea wetland.
Background
Currently, globally, invasion of foreign species has become the second most damaging factor that severely affects biodiversity following habitat disruption. The severity of the damage is more prominent due to the openness and fragility of the grass-sea wetland. The types of the ecological systems of the grass-sea wetland in China are complex and various, more opportunities are provided for the invasion of foreign species, and the prevention situation is more and more severe.
The grass sea is located in south-west urban county of the national kingdom of the national Hui nationality of Weining Yi nationality of Guizhou province, and approved by the State Council in 1992 to promote to the national level natural reserve. The grassland consists of water areas, swamps, meadows, abundant aquatic animal and plant species and aquatic microbial communities with high productivity, is a complete plateau wetland ecosystem, has extremely important ecological values of water storage, flood prevention and regional climate regulation, and provides important fields for conservation of water sources, aquatic animals and plants, endangered wild animals, particularly aquatic birds for life, overwintering and breeding, and is praised as a 'species gene bank' and an 'open natural museum' by the scientific community. The grass sea is the largest natural freshwater lake on the Guizhou plateau, is a Wumeng mountain foot abdominal area of a national-level natural protection area positioned at the top end of the middle of the Yugui plateau, is located at the southwest corner of the city of the Weining Yi nationality seedling family autonomous county and county of the Guizhou province, and belongs to a national-level natural protection area of a wetland ecosystem type. The natural protection area of the grass sea national level is a complete and typical plateau wetland ecosystem and is one of the main overwintering areas of the special plateau crane black-neck cranes in China. The area is 9600 hectare, the climate is subtropical plateau monsoon climate, and the geographic coordinates are about longitude east longitude 104 degrees 12 'to 104 degrees 18', north latitude 26 degrees 49 'to 26 degrees 53'. The altitude is 2170-2300 m, and the main protected object is a black-neck crane.
The peripheral water systems of the lake of the source of the Luoze river, the grass sea belongs to the Jinshajiang river branch Yangtze river of the Yangtze river system, are distributed in a radial mode, are respectively injected into the Yangtze river, the Wujiang river, the Beipan river and the cowry river from the north, the east, the south and the west, and the water supply of the lake is mainly atmospheric precipitation and is secondly underground water. Therefore, the grass sea is a plateau lake wetland ecosystem mainly depending on precipitation supply.
In recent years, species with strong adaptability, such as alternanthera philoxeroides, reeds and the like, gradually appear in the grass sea. The plants are introduced into other countries or regions from the origin, form dominant populations due to adaptability, strong reproductive capacity, lack of natural enemies and the like, and finally become invasive species and have a rapid diffusion tendency. The grass sea wetland provides an excellent living environment for the invaded species due to the ecological vulnerability of the grass sea wetland, so that the number of the habitat-damaging species is reduced. However, no report is found on the invasion risk assessment method of the foreign species of the grass sea wetland in the prior art. Therefore, there is a need to establish a risk assessment system for foreign species invasion.
Through the above analysis, the problems and defects of the prior art are as follows: in the prior art, no report is found about an invasion risk evaluation method of foreign species in the grass sea wetland.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for measuring the invasion risk of foreign species in a grass sea wetland.
The invention is realized in such a way that the method for measuring the invasion risk of the foreign species of the grass sea wetland comprises the following steps:
acquiring alligator alternanthera data and reed data;
evaluating the invasion risk of the dominant plants of the grass sea wetland;
thirdly, evaluating the invasion risk of the invasive plants of the grass sea wetland;
step four, constructing a grass sea wetland invasive plant early warning system;
establishing an evaluation standard of the ecological risk of the invasion of the grass sea species;
and step six, processing data by adopting a simple calculation method.
Further, in the first step, the method for acquiring alternanthera philoxeroides data and reed data comprises the following steps:
the method comprises the steps of collecting alligator alternanthera data through document retrieval and data reading, and obtaining reed data through data written by the predecessors and grass sea wetland investigation.
Further, in the step one, the alternanthera philoxeroides data and the reed data are used for carrying out invasive ecological risk evaluation on the alternanthera philoxeroides and the reeds in the grass sea wetland on the basis of collecting information and data of feasibility of invasion, growth adaptation, diffusion, harm and prevention and control.
Further, in the second step, the superior plants of the grass sea wetland comprise reed.
Further, in the third step, the plant invaded by the grass sea wetland comprises alternanthera philoxeroides.
Further, in the fourth step, the grass-sea wetland invasive plant early warning system comprises a target layer, a first-level index and a second-level index, wherein the weights of all levels of indexes of the system adopt an analytic hierarchy process, the total rating of the whole system is 100, and different scores are given to all levels of indexes according to different weights.
Further, in the fourth step, the early warning system for plants invaded by the grass-sea wetland comprises:
and the target layer comprises 15 points of invasion risk, 25 points of survival risk, 15 points of diffusion risk, 30 points of harm and influence and 15 points of prevention and treatment feasibility.
The first-level indexes corresponding to the intrusion risk comprise 8% of an intrusion path, 4% of the current state of the intrusion path management and 3% of customs interception frequency; the first-level indexes corresponding to the survival risk comprise 7% of environment survival conditions, 7% of difficulty and natural enemy quantity of population establishment and 11% of self biological characteristics; the first-level indexes corresponding to the diffusion risks comprise 8% of diffusion modes and 7% of distribution conditions; the first-level indexes corresponding to the harm and the influence comprise 8% of influence on an ecological system of the land, 13% of influence on the variety of the species of the land and 12% of economic and other influences; the first-level index corresponding to the control feasibility comprises 8% of control method and effect, 5% of control recovery time and belt cost and 2% of control process influence on native species.
And the second-level indexes corresponding to the intrusion risk comprise 3 points of artificial introduction, 2 points of unintentional introduction and 3 points of natural introduction, 2 points of the existing management system and 2 points of inspection and quarantine system in the current law, wherein the value of the interception frequency is more than 10 percent is 3 points, the value of the interception frequency is 6-10 percent is 2 points, and the value of the interception frequency is 1-5 percent.
The second-level indexes corresponding to the survival risk comprise that the climate is suitable for 4 minutes, the soil and water environment are suitable for 3 minutes, the number of easy natural enemies of the established population is less than 3 minutes, the number of difficult natural enemies of the established population is more than 2 minutes, the number of easy natural enemies of the established population is more than 2 minutes, and the propagation characteristics are as follows: sexual reproduction 2 points, asexual reproduction 2 points, stress resistance 2 points, growth speed 1 point, seed preservation time 1 point, and reproductive capacity: one year of life/weakness 1 point, one year of two years 2 points, one year of life/weakness 5 points.
The secondary indexes corresponding to the diffusion risks comprise 2 minutes of wind power diffusion, 2 minutes of hydraulic power diffusion, 2 minutes of animal propagation, 2 minutes of human and transportation means and the like, which serve as media propagation, and the current invasion distribution range is wide by 3 minutes, the distribution density is 2 minutes, and the occupied ecological type is 2 minutes.
The secondary indexes corresponding to the harm and influence include 4 points of influence on the process of the grass sea wetland ecosystem, 4 points of influence on factors of the grass sea wetland ecosystem, 3 points of resource competitiveness, 2 points of allelopathy inhibition, 2 points of whether high-density occupation of the habitat can be achieved, 2 points of natural hybridization capacity, 1 point of toxicity or thorny, 1 point of parasitism and host property, 2 points of threat on grass sea wetland species or communities, 4 points of influence on agriculture and forestry, 2 points of influence on aquaculture or port rivers, 4 points of influence on tourist landscape resources, and 2 points of influence on crowd health and other influences.
The second-level indexes corresponding to the control feasibility comprise 2 minutes of mechanical control feasibility, 2 minutes of chemical control feasibility, 2 minutes of biological control feasibility and 2 minutes of comprehensive treatment necessity, and have the advantages of poor control effect, high cost, large difficulty of 5 minutes, general control effect of 3 minutes, remarkable and simple control effect and low cost of 1 minute; the prevention and treatment investment cost is 1 point, and the side effect of the prevention and treatment measures is 1 point.
Further, in the fifth step, the establishment of the evaluation criteria for the ecological risk of invasion of the grass sea species comprises the following steps:
the classification of the foreign species intrusion risk evaluation standard grade is to make reference according to the existing standard, construct risk values corresponding to the risk grade classification, and then adopt management means and control measures of different degrees according to different risk conditions. The sum of scores of a plurality of secondary indexes of the alternanthera philoxeroides and the reeds passing through five target layers is the final evaluation score.
Further, in the fifth step, the evaluation criteria of the ecological risk of grass sea species invasion include:
the risk grades of the evaluation standard of the ecological risk of the invasion of the grass sea species comprise first grade, second grade, third grade, fourth grade and fifth grade;
the first-level risk grade represents extremely high risk, and the comprehensive evaluation value is 81-100 points; the implication of the intrusion method is as follows: the invasion risk is extremely high, and the harm characteristics accord with the level of animal epidemic diseases, infectious diseases A, pests or malignant weeds; the management policy is to prohibit introduction.
The secondary risk grade represents a high risk, and the comprehensive evaluation value is divided into 61-80 parts; the implication of the intrusion method is as follows: the invasion risk is high, and the damage characteristics accord with the levels of epidemic diseases of animals of the second class, infectious diseases of the second class, pests of the second class or regional malignant weeds; the management policy is to prohibit introduction.
The third-level risk grade represents moderate risk, and the comprehensive evaluation value is divided into 41-60 points; the implication of the intrusion method is as follows: the invasion risk is moderate, and the danger characteristics accord with the levels of three kinds of animal epidemic diseases, C type infectious diseases, common weeds or common weeds; the management policy is to prohibit introduction.
The four-level risk grade represents a low risk, and the comprehensive evaluation value is divided into 21-40; the implication of the intrusion method is as follows: the invasion risk is low; the management policy is that it can be introduced, but should take precautions to control the risk.
The five-level risk grade represents no risk, and the comprehensive evaluation value is divided into 0-20; the implication of the intrusion method is as follows: no invasion risk exists; the management strategy can be introduced without taking precautionary measures.
Further, in the sixth step, the formula for performing data processing by using the simple calculation method is as follows:
X＝A+B+C+D+E
A＝a1+a2+a3
B＝b1+b2+b3+…
C＝c1+c2+c3+…
……
wherein, X represents the total score, A, B, C, D, E represents five index scores of invasion risk, survival risk, diffusion risk, harm and influence, and prevention and cure feasibility, and a, b, c, d, and e represent the weight of each secondary index.
By combining all the technical schemes, the invention has the advantages and positive effects that: according to the method for determining the invasion risk of the foreign species in the grass-sea wetland, provided by the invention, a biological invasion risk assessment index system is established, a typical foreign invasion species of allium alternatum and reeds which form dominant species at present are selected as assessment objects, the diffusion risk is assessed through a diffusion risk value, and the accurate analysis of the diffusion risk of the foreign invasion species is crucial to the control of the diffusion of the foreign invasion species in China. The invention provides a certain guarantee for ensuring the species diversity of the indigenous organisms, is one of the most effective means for preventing the invasion of foreign species, and has great significance for protecting the species diversity of China by carrying out the risk evaluation of the foreign species.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a method for determining the invasion risk of foreign species in a grass sea wetland according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a method for measuring the invasion risk of foreign species in a grass sea wetland, and the invention is described in detail with reference to the attached drawings.
As shown in fig. 1, the method for determining the invasion risk of the foreign species in the grass-sea wetland provided by the embodiment of the invention comprises the following steps:
s101, acquiring alligator alternanthera data and reed data;
s102, evaluating the invasion risk of the dominant plants of the grass sea wetland;
s103, evaluating the invasion risk of the plants invaded by the grass-sea wetland;
s104, constructing a grass sea wetland invasive plant early warning system;
s105, establishing an evaluation standard of the ecological risk of the invasion of the grass sea species;
and S106, processing data by adopting a simple calculation method.
The method for determining the invasion risk of the foreign species in the grass-sea wetland provided by the invention can be implemented by other steps by persons skilled in the art, and the method for determining the invasion risk of the foreign species in the grass-sea wetland provided by the invention shown in fig. 1 is only one specific embodiment.
The technical solution of the present invention is further described with reference to the following examples.
1. According to the method, a risk evaluation index system of biological invasion is established, a typical external invasive species of alligator alternanthera and reed which forms dominant species at present are selected as evaluation objects, the diffusion risk is evaluated through a diffusion risk value, and the accurate analysis of the diffusion risk of the external invasive species is crucial to the control of the diffusion of the external invasive species in China.
2. The plant invasion not only affects the development of agricultural tourism industry and the like, but also hinders the development of ecology and economy, and in the grassy sea area, the propagation speed of the alternanthera philoxeroides and the reeds is high, and the plant community around the alternanthera philoxeroides and the reeds is affected. Therefore, the invasiveness of the plants is evaluated by constructing a plant invasion risk evaluation system. The risk grade is obtained according to the prior literature, and the construction of the risk index uses an analytic hierarchy process.
2.1 evaluation of invasion Risk of dominant plants in grass-sea wetland
The reed is a gramineous plant, can be seen everywhere in the grass sea wetland, is widely distributed, has stronger adaptability, is easy to form a single excellent community, and is easy to diffuse the existing dominant species.
2.2 evaluation of invasion Risk of invasive plants in grass-sea wetland
The alternanthera philoxeroides typically invades plants, and forms invasive species in the grass sea, so that the alternanthera philoxeroides is extremely invasive.
2.3 construction of early warning system for plants invading in grass sea wetland
The large-area growth of invasive species and dominant species not only can reduce the species diversity of the grass sea watershed, but also can reduce the ecological value of the grass sea due to the damage of the habitat, so that the construction of the early warning system for invasive plants of the grass sea wetland is extremely important. Biological invasion can be generally divided into five stages of invasion, acclimatization, diffusion, harm, prevention and the like, each stage has different expressed characteristics and different occupied weights, and the whole system is divided into three levels of target layers, a first-level index and a second-level index by integrating the evaluation system structure and the method for foreign species invasion. The weights of all levels of indexes of the system adopt an analytic hierarchy process, the total score of the whole system is 100, and different scores are given to all levels of indexes according to different weights. The specific evaluation methods are shown in Table 1.
TABLE 1 evaluation system for invasive plants in grass-sea wetland
Note: table frame structure is introduced in (Oujian, Luchanyi, Zhou Shudong, Zhouqin, Pengzong, Jiang Ying, Jiang Ju Sheng, etc.)
2.4 evaluation criteria for ecological risk of invasion of grass sea species
The classification of the foreign species intrusion risk evaluation standard grade is to make reference according to the existing standard, construct risk values corresponding to the risk grade classification, and then adopt management means and control measures of different degrees according to different risk conditions. The sum of the scores of the alligator alternanthera and the reed (the sum of the scores of five target layers) through a plurality of secondary indexes is the final evaluation score. The evaluation risk levels are set according to the existing standard 8 in table 2.
TABLE 2 evaluation criteria for ecological risk of invasion of grass sea species
Note: the evaluation standard derives from (Dinghui, Shibi, Xuhaigen. foreign species Risk assessment index system and assessment method)
2.5 major data sources
The data source of alligator alternanthera is mainly document retrieval, reading and collecting of data. The data source of the reed is mainly based on the data written by the predecessor and the investigation of the grass-sea wetland, and the two are used for carrying out the evaluation of the invasive ecological risks on the alternanthera philoxeroides and the reed of the grass-sea wetland on the basis of collecting information and data of invasion, growth suitability, diffusion, harm, feasibility of prevention and control and the like.
3. Data processing
The data processing adopts a simple calculation method:
the formula:
X＝A+B+C+D+E
A＝a1+a2+a3
B＝b1+b2+b3+…
C＝c1+c2+c3+…
……
x represents the total score A, B, C, D, E, which respectively represents five index scores of invasion risk, survival risk, diffusion risk, harm and influence, prevention and treatment feasibility and the like. a. b, c, d and e represent the weight of each secondary index.
4. Results and analysis
According to the data and the grass-sea wetland invasive plant early warning system, the alligator alternanthera and the reeds are evaluated, and the results are shown in tables 3 and 4.
TABLE 3 evaluation results of ecological risk of pennisetum sinese roxb invasion in grassland wetland
TABLE 4 evaluation results of ecological risks of plant reed invasion in grass-sea wetland
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for measuring the invasion risk of foreign species in a grass sea wetland is characterized by comprising the following steps:
acquiring alligator alternanthera data and reed data;
evaluating the invasion risk of dominant plants of the grass sea wetland;
evaluating the invasion risk of the invasive plants of the grass sea wetland;
constructing a grass sea wetland invasive plant early warning system;
establishing an evaluation standard of the ecological risk of grass sea species invasion;
and (4) processing data by adopting a simple calculation method.
2. The method for determining the invasion risk of the foreign species in the grass-sea wetland according to claim 1, wherein the method for acquiring the alternanthera philoxeroides data and the reed data comprises the following steps: collecting alligator alternanthera data through document retrieval and data reading, and acquiring reed data through data and grass sea wetland investigation.
3. The method for determining the risk of invasion by foreign species in the grassy-sea wetland as claimed in claim 1, wherein the alternanthera philoxeroides data and the reed data are used for carrying out the evaluation of the ecological risk of invasion on the alternanthera philoxeroides and the reed on the basis of collecting information and data of feasibility of invasion, acclimation, diffusion, harm and prevention.
4. The method of claim 1, wherein the dominant vegetation of the open pasture sea comprises reed.
5. The method for determining the invasion risk of foreign species in the grass-sea wetland according to claim 1, wherein the plants invaded by the grass-sea wetland comprise alternanthera philoxeroides.
6. The method for determining the invasion risk of the foreign species in the grass-sea wetland according to claim 1, wherein the grass-sea wetland invasion plant early warning system comprises a target layer, a first-level index and a second-level index, wherein the indexes of the system are weighted by an analytic hierarchy process, the total system score is 100, and different scores are given to the indexes of each level according to different weights.
7. The method for determining the invasion risk of the foreign species in the grass-sea wetland according to claim 1, wherein the grass-sea wetland invasion plant early warning system comprises:
a target layer, which comprises 15 points of invasion risk, 25 points of survival risk, 15 points of diffusion risk, 30 points of harm and influence and 15 points of prevention and treatment feasibility;
the first-level indexes corresponding to the intrusion risk comprise 8% of an intrusion path, 4% of the current state of the intrusion path management and 3% of customs interception frequency; the first-level indexes corresponding to the survival risk comprise 7% of environment survival conditions, 7% of difficulty and natural enemy quantity of population establishment and 11% of self biological characteristics; the first-level indexes corresponding to the diffusion risks comprise 8% of diffusion modes and 7% of distribution conditions; the first-level indexes corresponding to the harm and the influence comprise 8% of influence on an ecological system of the land, 13% of influence on the variety of the species of the land and 12% of economic and other influences; the first-level index corresponding to the control feasibility comprises 8% of control method and effect, 5% of control recovery time and belt cost and 2% of control process influence on native species;
the second-level indexes corresponding to the intrusion risk comprise 3 points of artificial introduction, 2 points of unintentional introduction and 3 points of natural introduction, 2 points of the existing management system and 2 points of inspection and quarantine system of the current law, wherein the value of the interception frequency is more than 10 percent is 3 points, the value of the interception frequency is 6-10 percent is 2 points, and the value of the interception frequency is 1-5 percent;
the second-level indexes corresponding to the survival risk comprise that the climate is suitable for 4 minutes, the soil and water environment are suitable for 3 minutes, the number of easy natural enemies of the established population is less than 3 minutes, the number of difficult natural enemies of the established population is more than 2 minutes, the number of easy natural enemies of the established population is more than 2 minutes, and the propagation characteristics are as follows: sexual reproduction 2 points, asexual reproduction 2 points, stress resistance 2 points, growth speed 1 point, seed preservation time 1 point, and reproductive capacity: 1 minute for one year of life/weakness, 2 minutes for two years in one year, and 5 minutes for more life/weakness in one year;
the secondary indexes corresponding to the diffusion risks comprise 2 minutes of wind power diffusion, 2 minutes of hydraulic power diffusion, 2 minutes of animal propagation, 2 minutes of human and transportation means and the like, which serve as media propagation, wherein the current invasion distribution range is wide by 3 minutes, the distribution density is 2 minutes, and the occupied ecological type is 2 minutes;
the secondary indexes corresponding to the harm and influence include 4 points of influence on the process of the grass sea wetland ecosystem, 4 points of influence on factors of the grass sea wetland ecosystem, 3 points of resource competition ability, 2 points of allelopathy inhibition, 2 points of whether high density occupies the habitat, 2 points of natural hybridization ability, 1 point of toxicity or thorny, 1 point of parasitism and host, 2 points of threat on grass sea wetland species or communities, 4 points of influence on agriculture and forestry, 2 points of influence on aquaculture or port river channels, 4 points of influence on tourist landscape resources, and 2 points of influence on crowd health and other factors;
the second-level indexes corresponding to the control feasibility comprise 2 minutes of mechanical control feasibility, 2 minutes of chemical control feasibility, 2 minutes of biological control feasibility and 2 minutes of comprehensive treatment necessity, and have the advantages of poor control effect, high cost, large difficulty of 5 minutes, general control effect of 3 minutes, remarkable and simple control effect and low cost of 1 minute; the prevention and treatment investment cost is 1 point, and the side effect of the prevention and treatment measures is 1 point.
8. The method for determining the invasion risk of the foreign species in the grass-sea wetland according to claim 1, wherein the establishment of the evaluation criteria for the ecological risk of invasion of the grass-sea species comprises the following steps: the classification of the foreign species intrusion risk evaluation standard grade is to make reference according to the existing standard, construct risk values corresponding to the risk grade classification, and then adopt management means and control measures of different degrees according to different risk conditions; the sum of scores of a plurality of secondary indexes of the alternanthera philoxeroides and the reeds passing through five target layers is the final evaluation score.
9. The method for determining the invasion risk of the foreign species in the grass sea wetland according to claim 1, wherein the evaluation criteria for the ecological risk of invasion of the grass sea species comprise:
the risk grades of the evaluation standard of the ecological risk of the invasion of the grass sea species comprise first grade, second grade, third grade, fourth grade and fifth grade;
the first-level risk grade represents extremely high risk, and the comprehensive evaluation value is 81-100 points; the implication of the intrusion method is as follows: the invasion risk is extremely high, and the harm characteristics accord with the level of animal epidemic diseases, infectious diseases A, pests or malignant weeds; the management strategy is to forbid introduction;
the secondary risk grade represents a high risk, and the comprehensive evaluation value is divided into 61-80 parts; the implication of the intrusion method is as follows: the invasion risk is high, and the damage characteristics accord with the levels of epidemic diseases of animals of the second class, infectious diseases of the second class, pests of the second class or regional malignant weeds; the management strategy is to forbid introduction;
the third-level risk grade represents moderate risk, and the comprehensive evaluation value is divided into 41-60 points; the implication of the intrusion method is as follows: the invasion risk is moderate, and the danger characteristics accord with the levels of three kinds of animal epidemic diseases, C type infectious diseases, common weeds or common weeds; the management strategy is to forbid introduction;
the four-level risk grade represents a low risk, and the comprehensive evaluation value is divided into 21-40; the implication of the intrusion method is as follows: the invasion risk is low; the management strategy can be introduced, but the risk is controlled by taking precautionary measures;
the five-level risk grade represents no risk, and the comprehensive evaluation value is divided into 0-20; the implication of the intrusion method is as follows: no invasion risk exists; the management strategy can be introduced without taking precautionary measures.
10. The method for determining the invasion risk of the foreign species in the grass-sea wetland according to claim 1, wherein the formula for processing the data by using the simple calculation method is as follows:
X＝A+B+C+D+E
A＝a1+a2+a3
B＝b1+b2+b3+…
C＝c1+c2+c3+…
……
wherein, X represents the total score, A, B, C, D, E represents five index scores of invasion risk, survival risk, diffusion risk, harm and influence, and prevention and cure feasibility, and a, b, c, d, and e represent the weight of each secondary index.
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