Dynamic Change And Sensitivity Analysis Of Huixian Karst Wetland

Huixian karst wetlands are the most typical karst wetlands in China and the world.In the process of the gradual shift of the center of gravity of Guilin's economic development to the southwest,Huixian karst wetlands gradually developed into the core area of urbanization,and was known as the"kidney of Guilin"for its unique wetland ecological functions and values.However,in recent decades,due to the influence of human activities and natural factors,the area of Xianxian Karst Wetland has continued to shrink,and its ecological function has gradually declined,and it has even been on the verge of extinction.In-depth research on the trend and driving factors of Huixian karst wetland area can provide scientific guidance for the protection of Huixian karst wetland ecological environment and the rational development and utilization of wetland resources.This article is based on 3S technology,using ENVI to use visual interpretation and supervised classification methods,with seven periods of 1987,1992,1996,2001,2006,2011,2016 as the main data source,to the Huixian karst wetland nearly 30a Analyze the dynamic changes and the sensitivity of parameters.The main research conclusions are as follows:(1)On the basis of field investigation of Huixian karst wetland and the surface attachments in Huixian karst wetland,this article divides the fairy karst wetland into 6categories:water body,fish pond,architecture,vegetation,farmland and unused.(2)This article uses supervised classification and visual interpretation to extract information from the 7th period of the research area,correct the field survey data and Ovi map,etc.,and complete the extraction of the classification information of Huixian karst wetland,and draw out 7 periods of different periods.Interpret maps of distribution of places.(3)The core area of Huixian karst wetlands in Guangxi mainly includes Dulongtang,Mudong Lake and their surrounding areas.The study found that in the past 30 years,the decrease in water area was 4.52 km~2,and the increase in fish pond area was 2.81 km2.The decrease in water area was much greater than the increase in fish pond area.The interpretation results show that the wetland area is shrinking seriously.(4)Affected by human activities and global climate change,Huixian wetland resources and water area are affected to varying degrees.In this paper,a sensitivity index system for the driving factors of water area is constructed.AHP is used to quantitatively calculate the influencing factors of wetland area changes.Sensitivity analysis shows that agricultural reclamation and fish pond development are the main causes of the shrinkage of Huixian wetland natural water area factor.