Dynamic Transformation Process And Influencing Factors Of Marsh Wetland Farmland In The Northeast Of Sanjiang Plain

The Sanjiang Plain is a concentrated distribution area of China’s wetlands.At the same time,it is one of the only three black land in the world.Due to its special attributes and geographical location,the Sanjiang Plain area is very important for ensuring regional ecological security and ensuring food production safety.The meaning.The northeastern part of the Sanjiang Plain is located in the hinterland of the Sanjiang Plain.It is located in the center of the Sanjiang Plain and has a unique representation of the wetlands and ecological changes in the Sanjiang Plain.Under the influence of humans and nature,a large number of marsh wetlands in the study area have been reclaimed as cultivated land,and some wetlands have caused vegetation degradation due to natural causes.Due to the large reduction of wetlands,a series of ecological and environmental problems have arisen.If the existing wetlands are not Protection will lead to an increase in the deterioration of the ecological environment in the Sanjiang Plain,which will have irreversible consequences.Therefore,by studying the dynamic changes and distribution patterns of marsh wetlands for nearly 70 years,it can provide wetlands and farmland,and also restore the marsh wetlands and improve the ecological environment.Contribute to other aspects.The main purposes of this thesis include: combining remote sensing(RS)with geographic information system(GIS)technology for the northeastern part of the Sanjiang Plain during the period 1950-2016(including Fujin,Tongjiang,Baoqing,Fuyuan And Raohe)analysis of the area,type,change,distribution and influencing factors of the conversion dynamics of marsh wetland farmland.The research method is to process characteristics of the area,distribution pattern and dynamic evolution of the marsh wetland and farmland in the northeastern part of the Sanjiang Plain.On the basis of data processing the data is comprehensively processed by using ENVI5.3 and Arc GIS software,and finally the current situation of marsh wetland and farmland information in the northeast of Sanjiang Plain is formed.According to the processing results,the study area is analyzed from the spatial distribution,quantitative change,rate of change,centroid migration and landscape pattern index of marsh wetland and farmland and socioeconomic data.Factors such as the analysis of wetland and farmland conversion by information data analysis.The research shows that:(1)The swamp wetland shows a significant decrease in 70 years,while the farmland shows an increasing trend and most of the swamp wetland is transferred to farmland.(2)The centroid migration paths of swamp wetlands and paddy fields are trending from north to south,and by 2016,the three centroids are located in Fujin.(3)Analysis of landscape pattern changes of marsh wetland and farmland.The aggregation degree and plaque agglomeration index of the marsh wetland in this area gradually decreased,and the average adjacent distance index gradually increased.The farmland aggregation index and the plaque agglomeration index gradually increased and the average adjacent distance index gradually decreased;the degree of fragmentation of marsh wetland and farmland Both showed strong volatility,and the plaque density and fragmentation degree showed a trend of rising first and then decreasing.The marsh wetland landscape shape index and the area weighted shape index showed a downward trend;the maximum patch index of the marsh wetland and the area specific gravity index of the patch type showed opposite trends with the farmland.(4)By analyzing the influencing factors of the dynamic conversion of swamp wetland in the northeastern Sanjiang Plain,the main factors of the transformation of swamp wetland and farmland in the study area a larger role effect.Through the study of the spatial pattern evolution of marsh wetland and farmland in the northeastern Sanjiang Plain,the internal and external factors affecting the ecological environment of the marsh wetland in the northeastern part of the Sanjiang Plain are analyzed,which is of great significance for the protection of ecosystems and species diversity and future sustainable development.