基于PLSPM模型的鄂西南部分区域耕地土壤pH影响因素研究

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p H大小分别是:水浇地旱地水田;不同成土母质发育的土壤p H有所差异,碳酸盐岩发育的土壤p H较高,结晶岩和泥质岩发育的土壤p H较低;耕地土壤p H多因素综合模型显示,人为活动是该区耕地土壤p H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。

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

Based on soil pH data collected in some areas of Southwest Hubei Province, the influencing factors were studied. The results showed that: (1) The soil pH of the cultivated land in the study area shows that a trend of decreasing from northeast to southwest, and it is acidic soil; (2) The soil pH values of different cultivated land types are: irrigated land> dry land> paddy field; (3) The pH of the soil developed by different soil-forming parent materials is different, the pH of the soil developed by carbonate rock is higher, and the pH of soil developed by crystalline rock and argillaceous rock is lower; (4) The " multi-factor integrated model of soil pH in cultivated land" shows that human activities are the main influencing factors of cultivated soil pH, followed by climate, crops and terrain; (5) The response degree of cultivated land with different soil acidity and alkalinity to influencing factors is different. Neutral and weakly alkaline soils have a positive response to anthropogenic activities. Strongly acidic and weakly acidic soils also have positive responses to crop growth and topography. Very strongly acidic soils have the lowest response to human activities, and weakly alkaline soils have the strongest response to climate.