Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (1): 89-97.doi: 10.11924/j.issn.1000-6850.casb20190800577

Special Issue: 耕地保护

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Thickness and Soil Nutrients of Typical Cultivated Land in Jinzhong Basin: Spatial Variation

Qiao Lei1, Huang Mingjing2, Zhang Wuping1(), Wang Guofang1, Ren Jian1   

  1. 1 College of Resources and Environment, Shanxi Agricultural University, Taigu Shanxi 030800;
    2 Dryland Agriculture Research Center, Shanxi Academy of Agricultural Sciences, Taiyuan 030031
  • Received:2019-08-27 Revised:2019-10-21 Online:2020-01-05 Published:2020-01-07
  • Contact: Zhang Wuping E-mail:zwping@126.com

Abstract:

The paper aims to explore the spatial pattern and spatial variation rule of thickness and soil nutrients of the cultivated land in dry farming region. Taking typical cultivated land in Jinzhong basin as the research object, we analyzed the spatial variation of thickness of cultivated layer (TCL) and soil nutrients by geostatistics method, with soil organic matter (SOM), pH value, available phosphorus (AP) and slow-effect potassium (SK) as the soil nutrients indexes. The results showed that: (1) the spatial autocorrelation of each index decreased with the increase of distance; (2) the optimum semivariance model of AP was Gaussian model, and the optimum semivariance model of other indexes was exponential model; the ratio of Nugget to Sill of each index was: SOM>AP>pH>TCL>SK; (3) the spatial pattern of TCL and AP had the tendency of higher in northwest and lower in southeast, SK had the spatial pattern of higher in northeast and lower in southwest, SOM had the spatial pattern of higher in southwest and lower in northeast, the pH value was high in the whole study area except Beiguang. In conclusion, geostatistical method can describe the spatial pattern and variation characteristics of soil properties well; in the spatial variation process of soil properties, the randomness and structure coexist, and the randomness is less than 50%.

Key words: cultivated soil, geostatistics, Moran's I, thickness of cultivated layer, soil nutrients

CLC Number: