Surface soil moisture retrieval using multi-temporal Sentinel-1 SAR data in karst rocky desertification area
Received:October 15, 2019  Revised:August 19, 2020  download
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Author NameAffiliationE-mail
CHEN Quan School of Geography and Environmental Science/School of Karst Science, Guizhou Normal University, Guizhou Normal University, Guiyang, 550001
The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, 550001
State Engineering Technology Institute for Karst Desertification Control, Guiyang, 550001 
cnqu123@163.com 
ZHOU Zhong-Fa School of Geography and Environmental Science/School of Karst Science, Guizhou Normal University, Guizhou Normal University, Guiyang, 550001
The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, 550001
State Engineering Technology Institute for Karst Desertification Control, Guiyang, 550001 
fa6897@163.com 
WANG Ling-Yu School of Geography and Environmental Science/School of Karst Science, Guizhou Normal University, Guizhou Normal University, Guiyang, 550001
The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, 550001
State Engineering Technology Institute for Karst Desertification Control, Guiyang, 550001 
 
DAN Yu-Sheng School of Geography and Environmental Science/School of Karst Science, Guizhou Normal University, Guizhou Normal University, Guiyang, 550001
The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, 550001
State Engineering Technology Institute for Karst Desertification Control, Guiyang, 550001 
 
TANG Yun-Tao School of Geography and Environmental Science/School of Karst Science, Guizhou Normal University, Guizhou Normal University, Guiyang, 550001
The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang, 550001
State Engineering Technology Institute for Karst Desertification Control, Guiyang, 550001 
 
Abstract:Soil moisture is the core component that links the earth"s surface water cycle, energy cycle and biogeochemical cycle, and it is also the key parameter to study the ecosystem in karst rocky desertification area. The aim of this study was to retrieve the soil moisture with multi-temporal Sentinel-1 C-band SAR data and observation equations were constructed by using the Alpha approximation model over karst rocky desertification area. The spatial and temporal variation characteristics and the error influencing factors of the soil moisture retrieval results were analyzed. It is found that the overall change trend of soil moisture in the observation period is highly consistent with the trend of rainfall change. The maximum value of soil moisture and the degree of spatial heterogeneity in karst rocky desertification area is significantly higher than those in non-rocky desertification area. The results were validated using ground measurements of one acquisition date, with root mean squared error (RMSE) value of 0.059 cm3/cm3 and mean bias value of 0.026 cm3/cm3. The method of retrieval of soil moisture by Alpha approximate model is applicable to karst rocky desertification area, the mixed pixel problem caused by the surrounding complex habitat conditions of the surface soil is the main influencing factor of inversion error. These results can provide reference to obtaining soil moisture under mountain complex environment by multi-temporal observation method, and provide support for ecosystem restoration and ecological industry development in karst rocky desertification area.
keywords:soil moisture  synthetic aperture radar  multi-temporal  inversion  karst rocky desertification
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Copyright:《Journal of Infrared And Millimeter Waves》