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Field-scale spatial variability of soil calcium in a semi-arid region:Implications for soil erosion and site-specific management

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Pedosphere 2021年第5期31卷 705-714页

作者： Yazhou SUN Wenxuan GUO David CWEINDORF Fujun SUN Sanjit DEB Guofeng CAO Jasmine NEUPANE Zhe LIN Abir RAIHAN Department of Plant and Soil Science Texas Tech UniversityLubbock TX 79409(USA) Department of Soil and Crop Sciences Texas A&M AgriLife ResearchLubbock TX 79403(USA) Department of Earth and Atmospheric Sciences Central Michigan UniversityMount Pleasant MI 48859(USA) College of Land and Environment Shenyang Agricultural UniversityShenyang 110866(China) Department of Geography University of ColoradoBoulder CO 80309(USA)

Excess calcium(Ca)in soils of semi-arid and arid regions has negative effects on soil structure and chemical properties,which limits the crop root growth as well as the availability of soil water and *** the spatial variability of soil Ca contents may reveal factors influencing soil erosion and provide a basis for site-specific soil and crop management in semi-arid *** study sought to assess the spatial variability of soil Ca in relation to topography,hydraulic attributes,and soil types for precision soil and crop management in a 194-ha production field in the Southern High Plains of Texas,*** at four depth increments(0-2,0-15,15-30,and 30-60 cm)were sampled at 232 points in the spring of *** Ca content of each sample was determined with a DP-6000 Delta Premium portable X-ray fluorescence(PXRF)*** data was obtained using a real-time kinematic GPS receiver with centimeter-level accuracy.A digital elevation model(DEM)was derived from the elevation data,and topographic and hydraulic attributes were generated from this DEM.A generalized least-squares model was then developed to assess the relationship between soil Ca contents of the four layers and the topographic and hydraulic *** showed that topographic attributes,especially slope and elevation,had a significant effect on soil Ca content at different depths(Phydraulic attributes,especially flow length and sediment transport index(STI),had a significant effect on the spatial distribution of soil *** variability of soil Ca and its relationships with topographic and hydraulic attributes and soil types indicated that surface soil loss may occur due to water or wind erosion,especially on susceptible soils with high ***,this study suggests that the application of PXRF in assessing soil Ca content can potentially facilitate a new method for soil erosion evaluation in semi-arid *** results of this study provide

关键词： hydraulic attributes portable X-ray fluorescence spectrometry precision agriculture soil conservation topography

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