Response Of Soil Moisture To Land Cover Change Based On AMSR-E Data In Eastern China

Research on the influence factors of soil moisture has been concerned.Great support is built by the development of passive microwave.However,the using of passive microwave data is limited by the low spatial resolution.Rapid economic growth,evident change of land cover in eastern region of China inevitably affect soil water content and distribution.This research based on AMR-E soil moisture data downscaling calculation by using trajectory analysis to study the change state of land cover during past period(2003-2010)and qualification demonstrate the effects of land cover on soil moisture in east region of China,(1)Methods research of AMSR-E soil moisture dataAMSR-E downscaling calculation has been done through the analysis of linear negative correlation to acquire the refutations results of 1 neter spatial resolution in east region of China.Downscaling outcomes are tested by the measured soil moisture data.Verification index contain determination coefficient R2,absolute error(ABVR),relative error(REVR)?root mean square error(RMSE)and maximum deviation(MaxE)and minimum deviation(MinE).The result shows that downscaling refutation results are highly accurate data,even some errors which are within allowed range are inevitable.The research using soil moisture downscaling refutation data on soil moisture is available in east region of China.(2)The analysis on the change of land cover in east China based on MODIS MCD12Q1 dataThis portion of this research describes the change state of land cover by using trajectory analysis in east China during 2003-2010.Farmland and forestland are typical land use type in east China,then combining grassplot and construction land.Different change of land use type can be observed by the utilizing of MODIS MCD12Q1 land cover type product,which can qualification show the change of each land use type in each grid during research year.(3)The analysis to the influence of land cover change on soil moisture in east China.To study the influence of land cover on soil moisture.which is qualified by the combination between soil moisture downscaling refutation results and land cover change.This research take farmland and forestland as examples to demonstrate study process.Soil water content of refutation change code has been acquired to quantify demonstrate the change of soil water content in different tillage year and afforest year.Soil water content decreased year by year with the increase of tillage;Contrarily,growth trend of soil water content has been observed with the increase of afforest year.This method is also available for other refutation change process to study soil water content change.