Arid Zone Research ›› 2022, Vol. 39 ›› Issue (2): 646-655.doi: 10.13866/j.azr.2022.02.31

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Precise management zoning in arid soil croplands based on multi-source data

BAI Jianduo1(),PENG Jie1(),SHI Zhou2,WANG Yuzhen1,LIU Weiyang1,LI Hongyi3   

  1. 1. College of Agriculture, Tarim University, Alar 843300, Xinjiang, China
    2. Institute of Agricultural Remote Sensing and Information Technology Application, Zhejiang University, Hangzhou 310058, Zhejiang, China
    3. College of Tourism and Urban Management, Jiangxi University of Finance and Economics, Nanchang 330000, Jiangxi, China
  • Received:2021-08-21 Revised:2021-12-03 Online:2022-03-15 Published:2022-03-30
  • Contact: Jie PENG E-mail:bjdzky@163.com;pjzky@163.com

Abstract:

According to the spatial heterogeneity of soil salinization, the precise management precise zoning of oasis farmland in the arid area of Southern Xinjiang is of great significance for the adjustment of areas, based on spatial heterogeneity in soil salinization, is important for determining agricultural planting structure structures and fine-scale management. This study selected the topical oasis farmland in arid zone as the study object and used electromagnetic induction data, topographic date, and satellite remote sensing data as for oasis farmland in the data sources. We analyzed arid zone of Southern Xinjiang to analyze the spatial heterogeneity of soil salinization by geostatistical. Geostatistical methods and screened the were used to evaluate vegetation index and salt index in indices for different periods with correlation analysis. The surface apparent electrical conductivity (ECh0.375) of the farmland was used as the main variable, and the deep apparent electrical conductivity (ECh0.75, ECV0.75, ECV1.5), vegetation index (RVI, GRVI, EVI), and soil salinity index (NDSI, S5, SI-T) were used as the auxiliary variables. The study area was partitioned by using an object-oriented multi-scale segmentation algorithm, and the zoning results were evaluated by the mean Coefficient of variation (CV) and Moran’s I. The results showed that there was obvious spatial heterogeneity in the apparent electrical conductivity of each soil layers in the study area, and the auxiliary variables were significantly correlated with the main variable. The average coefficient of variation of each partition was reduced by 60% compared with that of the whole study area, and the. The interval heterogeneity based on multi-source data zoning was higher than that based on single-source data zoning. From the perspective of farmland cultivation, segmentation effects, and zoning evaluation principles, the, management zoning effect that integrated the information of surface and deep soil salinization was the best. And the zoning results were not only consistent with both local farmland management but also met the mechanized operation requirements. The findings can provide certain a technical and methodological reference for precise management zoning of oasis farmland in arid areas of Southern Xinjiang.

Key words: soil salinization, multi-source data, apparent electrical conductivity, object-oriented segmentation, precise management zoning, arid area