Surface soil moisture retrieval using multi-temporal Sentinel-1 SAR data in karst rocky desertification area
投稿时间:2019-10-15  修订日期:2020-08-19  download
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陈全 贵州师范大学地理与环境科学学院/喀斯特研究院贵州 贵阳 550001
贵州省喀斯特山地生态环境国家重点实验室培育基地贵州 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心贵州 贵阳 550001 
cnqu123@163.com 
周忠发 贵州师范大学地理与环境科学学院/喀斯特研究院贵州 贵阳 550001
贵州省喀斯特山地生态环境国家重点实验室培育基地贵州 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心贵州 贵阳 550001 
fa6897@163.com 
王玲玉 贵州师范大学地理与环境科学学院/喀斯特研究院贵州 贵阳 550001
贵州省喀斯特山地生态环境国家重点实验室培育基地贵州 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心贵州 贵阳 550001 
 
但雨生 贵州师范大学地理与环境科学学院/喀斯特研究院贵州 贵阳 550001
贵州省喀斯特山地生态环境国家重点实验室培育基地贵州 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心贵州 贵阳 550001 
 
汤云涛 贵州师范大学地理与环境科学学院/喀斯特研究院贵州 贵阳 550001
贵州省喀斯特山地生态环境国家重点实验室培育基地贵州 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心贵州 贵阳 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》