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四川盆地西缘土壤阳离子交换量的特征及影响因素
白志强, 张世熔, 钟钦梅, 王贵胤, 徐光荣, 马小杰
四川农业大学环境学院
摘要:
土壤阳离子交换量(CEC)因其对土壤肥力保护及污染评估具有重要意义而受到日益重视。对四川盆地西缘黄壤、黄棕壤、水稻土、紫色土、潮土和石灰土CEC进行系统比较及影响因素研究,结果表明:黄壤、水稻土和紫色土CEC显著低于黄棕壤(P<0.05),显著高于潮土(P<0.05)。同时,土壤CEC与年均温、积温呈负相关关系(P<0.01),而与年均降水量和湿润指数呈二次函数关系(P<0.01);山地土壤的CEC显著高于平原和丘陵土壤(P<0.05),且土壤CEC随海拔增加而极显著上升(P<0.01);冰碛物发育土壤的CEC显著高于河流冲积物和紫色粉砂岩发育土壤(P<0.05)。主成分分析结果表明,温度和降水组成的气候因素为该区土壤CEC的决定性影响因素。
关键词:  土壤CEC  气候因素  地形因素  成土母质  主成分分析
DOI:10.13758/j.cnki.tr.2020.03.023
分类号:X53
基金项目:四川省环境保护科技项目计划(2018HB30)资助。
Characteristics and Impact Factors of Soil Cation Exchange Capacity (CEC) in Western Margin of Sichuan Basin
BAI Zhiqiang, ZAHNG Shirong, ZHONG Qinmei, WANG Guiyin, XU Guangrong, MA Xiaojie
College of Environmental Sciences,Sichuan Agricultural University
Abstract:
Soil cation exchange capacity (CEC) has become a concern in the world for its importance in soil fertility and pollution. Characteristics and impact factors of CECs of yellow earth, yellow-brown earth, paddy soil, purple soil, fluvo-aquic soil and calcareous soil in the western margin of Sichuan Basin were investigated and compared in this study. The results showed that CECs were significantly lower in yellow earth, paddy soil and purple soil than in yellow-brown earth(P<0.05), but significantly higher than in fluvo-aquic soil(P<0.05). Soil CEC was significantly negatively correlated with mean annual temperatures, >0℃ and >10℃ cumulative temperatures(P<0.01), while showed quadratic function relation with precipitation and humidity index(P<0.01). CECs were higher in the mountain soils than in the plain and hill soils (P < 0.05), and soil CEC was significantly positively correlated with altitudes(P<0.01). CEC was higher in soils derived from glacial till than in soils derived from river alluvium and purple siltstone(P<0.05). The result of principal component analysis illustrated that temperature and precipitation of climate factors were the determinant for soil CEC in the study region.
Key words:  Soil CEC  Climate  Topography  Parent material  Principal component analysis

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