Land Use Change On The NPP(Net Primary Productivity) Of The Mekong River Basin

The Lancang-Mekong River Basin spans six Southeast Asian countries.The impact of the basin on the six countries covers energy production,manufacturing,food security,and ecosystems.Studying the correlation between land use change and net primary productivity in the Mekong River Basin,on the one hand,it can effectively grasp the characteristics of land use change in the river basin and its degree of response to changes in net primary productivity,the development of ecosystems in the river basin,and the prevention of natural disasters It has extremely important research significance.Based on MOD13Q1 data,meteorological data(precipitation,temperature,solar radiation)and other geospatial data,this paper uses decision tree classification to extract land use types,and uses land use change feature analysis methods,area statistics,land use transfer matrix,land use types Contribution rate matrix,comprehensive land use dynamics,regional land use degree analysis model,Markov prediction model,etc.,from the perspective of the amount and structure of land use,analyzed the spatial and temporal distribution of the land use change in the Mekong River from 2005 to 2017.Combine MODIS data with meteorological data,use the CASA model to estimate net primary productivity,and finally analyze the impact of land use changes on net primary productivity and the spatial and temporal distribution of net primary productivity from the basis of watershed scale and national scale within the basin feature.Visualize the obtained research results through the developed evaluation system.(1)The forest coverage of the study area is high,the grassland is mainly distributed in the Chinese section of the Mekong River Basin in the study area,the forest is widely distributed in the study area,and the cultivated land is the third major cover type in the study area,it is mainly distributed in Thailand,Cambodia and Vietnam of the Mekong River Basin(2)The net primary productivity of artificial surface and water in this article is almost negligible,so this article mainly explores the conversion of NPP(net primaryproductivity): forest,grassland,cultivated land,wetland vegetation to forest,grassland,cultivated land,wetland vegetation,water body,construction land,Using the transfer variables of land use types and the average change in NPP per unit area,we can obtain the changes in NPP(net primary productivity)caused by land use changes.From the watershed scale,the transfer and transfer of water bodies and man-made surfaces from 2005 to 2017 The area is relatively small,the impact on NPP(net primary productivity)is not large,the forest transfer area is large,and the average value of the forest NPP(net primary productivity)unit area is the largest in the river basin,which shows that the Mekong River Basin in 2005-2017 Changes in land use have increased NPP(Net Primary Productivity).