基于PLSPM模型的鄂西南部分区域耕地土壤pH影响因素研究

Influencing Factors of Farmland Soil pH in Southwest Hubei Based on PLSPM Model

选用鄂西南部分区域采集的土壤pH数据,进行其影响因素研究。结果表明:研究区耕地土壤pH呈现东北向西南降低的趋势,整体属于酸性土壤;不同耕地类型土壤pH大小分别是:水浇地>旱地>水田;不同成土母质发育的土壤pH有所差异,碳酸盐岩发育的土壤pH较高,结晶岩和泥质岩发育的土壤pH较低;耕地土壤pH多因素综合模型显示,人为活动是该区耕地土壤pH的主要影响因素,其后依次是气候、作物和地形;不同土壤酸碱性的耕地对影响因素的响应程度存在差异,中性和弱碱性土壤对人为活动表现为正向响应,强酸性及弱酸性土壤对作物长势和地形同样表现为正向响应,极强酸性土壤对人为活动的响应程度最低,弱碱性土壤对气候的响应程度最强。

In this paper the influencing factors of farmland soil pH in southwest Hubei Province were studied based on 1757 samples of 0–20 cm soil layer collected and measured in 2017.The results showed that pH decreased from northeast to southwest in the study region,and farmland soils were generally acidic.pH values of different farmland types were in the order of irrigated farmland>dry farmland>paddy field.pH values were different in soils derived from different parent materials,it was higher in soil derived from carbonate rock while lower in soil derived from crystalline and argillaceous rocks.Multi-factor integrated model of farmland soil pH showed that human activities were the main influencing factors of soil pH,followed by climate,crops and terrain.Farmland soils with different acidity and alkalinity responded differently to influencing factors,neutral and weakly alkaline soils positively responded to anthropogenic activities,strongly acidic and weakly acidic soils positively responded to crop growth and topography,very strongly acidic soils responded minimally to human activities,and weakly alkaline soils responded maximally to climate.