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Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (4): 241-252.DOI: 10.7522/j.issn.1000-694X.2025.00095

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Calculation method of maize residue coverage in Naiman Banner and its influence on the calculation of soil wind erosion rate

Feixiang Wang1(), Tianle Zhen1, Jifeng Li1,2(), Huiru Li1,3, Zhongling Guo1,3, Chunping Chang1,2, Xialei Zhang1, Kaixin Yu1   

  1. 1.School of Geographic Sciences /, Hebei Normal University,Shijiazhuang 050024,China
    2.Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change /, Hebei Normal University,Shijiazhuang 050024,China
    3.Hebei Laboratory of Environmental Evolution and Ecological Construction, Hebei Normal University,Shijiazhuang 050024,China
  • Received:2025-05-12 Revised:2025-06-13 Online:2025-07-20 Published:2025-08-18
  • Contact: Jifeng Li

Abstract:

Crop residues can effectively restrain the occurrence of soil erosion in farmland, and obtaining accurate crop residue coverage is the key to improving the accuracy of soil erosion calculation. Taking the Maize residue coverage farmland in Naiman Banner as the research object, a Maize residue coverage calculation model was constructed using field-measured hyperspectral data and coverage data of Maize residue, combined with Sentinel-2 multispectral data. The spatiotemporal distribution characteristics of Maize Residue Coverage (FVC) during the wind erosion season from 2018 to 2022 (October to May of the following year) in the study area were analyzed. The impact of FVC calculation method on the calculation of soil erosion rate in farmland was evaluated by modifying the Revised Wind Erosion Equation (RWEQ). The results showed that: (1) The correlation between FVC in the study area and the cellulose absorption index (CAI) inverted from three-band high-reflectance spectra (2 190 nm, 740 nm, 443 nm). The FVC calculation model was constructed corresponding to the B12, B6, and B1 bands of Sentinel-2A: FVC= 1.344CAI-0.07, R2=0.77. (2)The FVC in the study area is approximately 19.3%, FVC calculated based on CAI can better reflect the true situation of Maize residue coverage than the FVC calculated based on the Normalized Vegetation Index (NDVI), which significantly underestimates FVC. The average annual FVC based on CAI is about 1.47 times that of FVC based on NDVI. (3) The average wind erosion rate in the study area is about 6.702 t·hm-2. The wind erosion rate calculated based on CAI is closer to the wind erosion observation results, and the wind erosion rate calculated based on NDVI is significantly overestimated by about 0.55 times. (4)The wind erosion of farmland soil in the research area is mainly concentrated in April and May, with slight and mild erosion in the southern and northern parts, and strong and extremely strong erosion in the central and northern edges.

Key words: Naiman Banner, cellulose absorption index, hyperspectral, maize residue cover, soil wind erosion

CLC Number: