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    2019, Vol. 18 Issue (02): 279-289     DOI: 10.1016/S2095-3119(18)62069-6
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Spatial variability of soil total nitrogen, phosphorus and potassium in Renshou County of Sichuan Basin, China
GAO Xue-song, XIAO Yi, DENG Liang-ji, LI Qi-quan, WANG Chang-quan, LI Bing, DENG Ou-ping, ZENG Min
College of Resources, Sichuan Agricultural University, Chengdu 611130, P.R.China
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Abstract 
Understanding soil nutrient distributions and the factors affecting them are crucial for fertilizer management and environmental protection in vulnerable ecological regions.  Based on 555 soil samples collected in 2012 in Renshou County, located in the purple soil hilly area of Sichuan Basin, China,  the spatial variability of soil total nitrogen (TN), total phosphorus (TP) and total potassium (TK) was studied with geostatistical analysis and the relative roles of the affecting factors were quantified using regression analysis.  The means of TN, TP and TK contents were 1.12, 0.82 and 9.64 g kg–1, respectively.  The coefficients of variation ranged from 30.56 to 38.75% and the nugget/sill ratios ranged from 0.45 to 0.61, indicating that the three soil nutrients had moderate variability and spatial dependence.  Two distribution patterns were observed.  TP and TK were associated with patterns of obvious spatial distribution trends while the spatial distribution of TN was characterized by higher variability.  Soil group, land use type and topographic factors explained 26.5, 35.6 and 8.4% of TN variability, respectively, with land use being the dominant factor.  Parent material, soil group, land use type and topographic factors explained 17.5, 10.7, 12.0 and 5.0% of TP variability, respectively, and both parent material and land use type played important roles.  Only parent material and soil type contributed to TK variability and could explain 25.1 and 13.7% of TK variability, respectively.  More attention should focus on adopting reasonable land use types for the purposes of fertilizer management and consider the different roles of the affecting factors at the landscape scale in this purple soil hilly area. 
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GAO Xue-song
XIAO Yi
DENG Liang-ji
LI Qi-quan
WANG Chang-quan
LI Bing
DENG Ou-ping
ZENG Min
Key wordssoil nutrient     spatial variability     affecting factors     purple soil hilly area of China     
Received: 2017-11-07; Accepted: 2018-07-23
Fund: This work was supported by grants from the National Key Research and Development Program of China (SQ2018YFD080041), and the Science Fund of the Education Department of Sichuan Province, China (16ZB0048).
Corresponding Authors: Correspondence LI Qi-quan, E-mail: liqq@lreis.ac.cn   
Cite this article:   
GAO Xue-song, XIAO Yi, DENG Liang-ji, LI Qi-quan, WANG Chang-quan, LI Bing, DENG Ou-ping, ZENG Min. 2019. Spatial variability of soil total nitrogen, phosphorus and potassium in Renshou County of Sichuan Basin, China. Journal of Integrative Agriculture, 18(02): 279-289.
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http://www.chinaagrisci.com/Jwk_zgnykxen/EN/10.1016/S2095-3119(18)62069-6      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2019/V18/I02/279
 
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