Abstract
Crop residues can retain soil moisture and increase soil organic matter. Crop residue cover is also a hot issue in agricultural remote sensing. Crop residue cover can be estimated linearly with cellulose absorption index (CAI), while moisture of crop residues and soil would reduce the accuracy of crop residue cover estimation. Crop residue and soil were used as materials to carry out the laboratory experiment to reveal the impact of moisture on crop residue cover estimation and eliminate said impact. This paper discovered a sensitive band, R2005, which can invert water content of materials to eliminate moisture effect and improve estimation accuracy of crop residue cover. In terms of inverting water content, compared with two ratio water indices proposed in 2016 (R1.6/R1.5, R1.6/R2.0), using R2005 can increase R2 from 0.828 to 0.935 and decline root-mean-square error (RMSE) from 0.12 to 0.07. At the point of results validation, R2 is 0.958 and RMSE is 0.06, indicating R2005 has a high accuracy. Another advantage of R2005 is that it is more suitable to promote to actual production because of simple and efficient band calculation.
Highlights
Crop residues refer to the crop stubble in the cultivated land after harvest
To study and eliminate impact of moisture on crop residue cover estimation, winter wheat residues and soil collected in Liaocheng City of Shandong province, China, were used as materials to carry out the laboratory experiment
Crop residue cover can be assessed by a linear model with cellulose absorption index (CAI), while moisture would lead to low estimations
Summary
Crop residues refer to the crop stubble in the cultivated land after harvest. Keeping crop residues in the farmland is one of the best agricultural management measures [1]. A large number of studies have shown that soil organic carbon content in farmland is the basis and guarantee for a high yield of crops [2,3,4,5]. Crop residues remaining in cultivated land play an important role in promoting soil carbon sequestration and improving soil fertility. It has been reported that the soil carbon pool will increase by 8%~35.7% in organic carbon content after maintaining crop residues in the crop land [6,7]. Crop residues covering the surface can effectively reduce the evapotranspiration of surface water and prevent soil erosion [8,9]. Crop residue cover on farmland is critical to agricultural development
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