Study On Landscape Pattern Change And Driving Force Of Longwan Lake Wetland In Eastern Jilin

As global climate change has attracted more and more attention,countries have put ecological and environmental issues in an important position,and many scholars have also conducted a lot of research on it.Wetland has the dual nature of water and land.It is not only an important environmental resource,but also one of the most important living environments for human beings.Wetland ecosystem,together with marine ecosystem and forest ecosystem,is known as the "three global ecosystems",which is of great significance in regulating water cycle and ecological balance.Wetlands are sensitive to climate change.Their response to the rising temperature caused by global climate change is reflected in the degradation of more and more wetlands,such as the reduction of wetland area,wetland fragmentation,rapid change of wetland landscape pattern and so on.Revealing the change of landscape pattern of wetland resources and analyzing its main driving forces are of great significance to the study of wetland under the background of global climate change.Longgang Volcanic Group in Eastern Jilin is the largest Volcanic Group in China.Most of its wetlands are Lake wetlands formed after volcanic eruption.They completely record the whole process of the gradual evolution of crater lake to wetland,which is of great research value for the study of wetland evolution.Taking Longwan National Nature Reserve in Jilin Province as the research area,taking Landsat series images,the climate data of Meihekou meteorological station and the statistical yearbook data of Huinan County as the data sources,this paper analyzes and discusses the change law of wetland landscape pattern of Longwan lake from 1985 to 2017 by using GIS,landscape ecology,SPSS statistical analysis,R language and other technologies and theories,The direct impact of natural factors and human activities on the change of wetland area is quantified.Finally,the driving factors of landscape pattern change of Longwan Lake wetland are analyzed by integrating natural and human factors.Through the analysis of Longwan Lake Wetland in Eastern Jilin,it is found that the total area of Longwan Lake Wetland showed a trend of reduction and degradation from1985 to 2017,which is mainly affected by the changes of spring temperature,annual average temperature and annual maximum temperature,summer precipitation,annual precipitation and hydrothermal conditions.From the change of land use,the change of cultivated land area has a significant impact on the wetland area.The reduction of wetland area is caused by the expansion of cultivated land to a certain extent.In addition,with the increase of the number of tourists,in order to improve the quality of tourists' perception,the construction of tourism facilities above the wetland has changed the shape of wetland patches to a certain extent,which is also one of the reasons for the simplification of the shape of wetland patches in Longwan lake.Finally,the main driving factor for the change of landscape pattern of Longwan Lake wetland is natural factor,but the human influence can not be ignored.