赣南地区土壤pH值分布的影响因素及其强度变化

目的] 研究赣南地区土壤pH值的影响因素和强度，为该区土壤酸化防治提供科学依据。方法] 以江西省赣州市南康区8 167组表层土壤为研究对象，利用卡方检验、相关系数等统计学方法，对土壤pH值分布特征及影响因素进行分析。结果] 研究区83.1%的土壤为强酸性（pH<5.0），中性及碱性土壤比例小于17%。土壤pH值主要受成土母质和地质背景等自然因素的影响，影响强度表现为：成土母质 > 地质背景 > 高程 > 用地类型 > 地貌。酸性土壤分布在古生代火成岩和地势较高的元素流失区；中生代沉积岩和地势低洼元素富集区中土壤呈现碱性化，同时人类活动对土壤酸化的贡献不容忽视。结论] 赣南地区土壤pH值形成主要受成土母质和地质背景控制，人类活动促使土壤pH值在不同土地利用类型上出现一定程度的异化。

Influencing Factors and Intensity Change of Soil pH Value in South Jiangxi Province

Objective] The influencing factors and intensity of soil pH value in Southern Jiangxi Province were studied to provide a scientific basis for soil acidification prevention and control. Methods] 8 167 surface soil samples in Nankang District, Ganzhou City were collected, and the distribution characteristics and influencing factors of soil pH value were analyzed by using Chi-square test and correlation coefficient methods. Results] 83.1% of the soil in the study area was highly acidity (pH<5.0), and the proportion of neutral and alkaline soil was less than 17%. The soil pH value was mainly affected by natural factors such as soil parent material and geological background. The influence intensity was as follows: parent material > geological background > elevation > land type > landform. Acidic soil was distributed in Paleozoic igneous rocks and the element loss areas with higher terrain, the soil in Mesozoic sedimentary rocks and low-lying areas with rich elements was alkaline. At the same time, the contribution of human activities to soil acidification could not be ignored. Conclusion] The soil pH value in Southern Jiangxi Province is mainly controlled by soil parent material and geological background, and human activities have caused a certain difference in soil pH value in different land use types.