Soil Moisture Retrieval of Farmland in Southern Shanxi: Based on Sentinel Multi-source Data

doi:10.11924/j.issn.1000-6850.casb20191000776

Abstract

Abstract:

Using remote sensing data to retrieve soil moisture of farmland is essential for monitoring agricultural drought and crop status, and predicting crop yield. Taking the winter wheat planting area in Wenxi of Shanxi as the study area, we wiped off vegetation influence by “water-cloud model”, established the relationship between soil backscattering coefficient and soil moisture to retrieve the soil moisture of the winter wheat planting area of Wenxi on March 19 ^th 2018. The results showed that: fusion image of microwave (Sentinel-1 image) combined with visible spectrum remote sensing image (Sentinel-2 image) could remove vegetation influence to improve the retrieval accuracy of soil moisture, VV polarization determination coefficient R ² was increased by 0.0914, and the RMSE was decreased by 0.0895%; the soil at middle valley plain and southeastern and northwestern tablelands of Wenxi was mildly drought, while it was moderately drought at the southwestern hills and eastern mountain lands. The spatial distribution of soil moisture retrieved is highly consistent with hypsographic condition, irrigation condition and farmland productivity grade, with low-lying terrains and favorable irrigation condition corresponding to regions of high soil moisture.

Key words: soil moisture, winter wheat spring drought, water-cloud model, Sentinel data, productivity grade

CLC Number:

S365

Liu Zhengchun, Feng Meichen, Xu Lishuai, Jing Yaodong, Bi Rutian. Soil Moisture Retrieval of Farmland in Southern Shanxi: Based on Sentinel Multi-source Data[J]. Chinese Agricultural Science Bulletin, 2020, 36(20): 51-58.

Figures/Tables 9

References 29

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参数	综合方式	草地	冬小麦	牧场
A	0.0012	0.0009	0.0018	0.0014
B	0.091	0.032	0.138	0.084

参数	综合方式	草地	冬小麦	牧场
A	0.0012	0.0009	0.0018	0.0014
B	0.091	0.032	0.138	0.084

干旱程度	土壤水分
偏湿	湿,土壤重量含水量大于20%
适宜	潮湿,土壤重量含水量在15%~20%
轻旱	湿润,土壤重量含水量在12%~15%
中旱	半干旱,土壤重量含水量8%左右
重旱	干旱,土壤重量含水量在5%以下

干旱程度	土壤水分
偏湿	湿,土壤重量含水量大于20%
适宜	潮湿,土壤重量含水量在15%~20%
轻旱	湿润,土壤重量含水量在12%~15%
中旱	半干旱,土壤重量含水量8%左右
重旱	干旱,土壤重量含水量在5%以下