干旱区研究2023，Vol.40Issue(12)：1907-1917,11.DOI:10.13866/j.azr.2023.12.04
陕西黄土区农田土壤主要养分特征及影响因素
Main nutrient characteristics and influencing factors of farmland soil in the Loess Plateau of the Shaanxi Province
摘要
Abstract
To explore the main soil nutrient characteristics and influencing factors of farmland in the Loess Plateau of Shaanxi,spatial analysis was conducted on the content of SOM,TN,AP,and AK using GIS and geostatistics methods based on the data from 5096 farmland sampling points with a depth of 0-20 cm in the study area.A geographic detector model was used to explore the degree to which 18 influencing factors explained the spatial variation of nutrients.The results showed that the average contents of SOM,TN,AP,and AK were 14.43 g·kg-1,0.92 g·kg-1,18.21 mg·kg-1,and 190.28 mg·kg-1,respectively,showing moderate variation.The four best-fit models for nutrients were all exponential models,with moderate spatial correlation among each nutrient.The combined effect of structural and random factors causes spatial differences in the nutrient content.The global spatial correlation of nutrients is TN>SOM>AK>AP.The regional differences in nutrient content are significant,indicating a gradually increasing trend from north to south.The single-factor effects of annual sunshine duration,annual average temperature,fertilizer use,and geomorphic type have stronger explanatory power for spatial variation in nutrient content but lesser than that of the interaction between the two factors.Research has shown that it is necessary to increase fertilizer input in the northern Shaanxi region,perform intensive cultivation in the Guanzhong region,and consider multiple factors in farmland construction.关键词
土壤主要养分/空间变异/影响因素/地理探测器模型/陕西黄土区Key words
main nutrients in soil/spatial variation/influencing factors/geological detector model/the Loess Plateau of Shaanxi Province引用本文复制引用
贺军奇,拜寒伟,徐轶玮,倪莉莉..陕西黄土区农田土壤主要养分特征及影响因素[J].干旱区研究,2023,40(12):1907-1917,11.基金项目
国家自然科学基金项目(41901034,42001033) （41901034,42001033）
陕西省哲学社会科学研究专项(2022HZ1859) （2022HZ1859）
