不同母质发育红壤酸性特征及影响因素  

Acidification characteristics and influencing factors of red soil developed from different parent materials

作　　者：龙泽东 孙梅[1] 曾希柏[2] 黄晶[3] 唐海明[1] 石丽红[1] 罗尊长[1] 孙耿[1] LONG Ze-dong;SUN Mei;ZENG Xi-bai;HUANG Jing;TANG Hai-ming;SHI Li-hong;LUO Zun-chang;SUN Geng(Hunan Soil and Fertilizer Institute,Changsha Hunan 410125;Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment,Ministry of Agriculture and Rural Affairs of P.R.China,Beijing 100081;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land,Beijing 100081)

机构地区：[1]湖南省土壤肥料研究所,湖南长沙410125 [2]中国农业科学院农业环境与可持续发展研究所/农业农村部农业环境重点实验室,北京100081 [3]中国农业科学院农业资源与农业区划研究所/耕地培育技术国家工程实验室,北京100081

出　　处：《中国土壤与肥料》2024年第5期1-7,共7页Soil and Fertilizer Sciences in China

基　　金：区域创新发展联合基金(U19A2048);湖南农业科技创新资金项目(2022CX78,2021CX36)。

摘　　要：采集了花岗岩风化物和第四纪红土发育的耕地土壤,比较强酸性(pH<5.0)和酸性(5.0≤pH<6.5)条件下土壤相关理化指标的差异,并应用相关性分析和冗余分析,探究两种红壤酸性特征差异和影响因素。结果表明,pH低于5.0的土壤中,两种红壤pH分别为4.85±0.11和4.60±0.43,二者差异不显著,但第四纪红土红壤交换性酸、阳离子交换量、游离氧化铁显著高于花岗岩风化物红壤,有机质、交换性Mg^(2+)、盐基饱和度则相反;pH 5.0~6.5的土壤中,两种红壤的pH分别为5.37±0.33和5.48±0.48,第四纪红土红壤的游离氧化铁含量显著高于花岗岩风化物红壤。两种红壤的pH与盐基离子总量、交换性Ca^(2+)、交换性Mg^(2+)、盐基饱和度呈显著正相关,而与交换性酸总量、交换性H+、交换性Al^(3+)呈显著负相关。Cultivated soils with granite and quaternary red earth parent were collected to compare the differences in soil physicochemical indicators under strongly acidic(pH<5.0)and acid(5.0≤pH<6.5)conditions,and correlation analysis and redundancy analysis were applied to investigate the differences and the factors influencing acidification in the two types of red soils.The results showed that under strong acid conditions(pH<5.0),the pH values of the two red soils were 4.85±0.11 and 4.60±0.43,respectively,without significant difference.However,the contents of exchangeable acid,CEC and free ferric oxide in the parent soil of quaternary red earth were significantly higher than those in the parent soil of granite,while the organic matter contents,exchangeable Mg^(2+)content and salt base saturation were opposite.Under acidic conditions(5.0≤pH<6.5),the pH values of the two parent soils were 5.37±0.33 and 5.48±0.48,respectively.The contents of calcium carbonate and free ferric oxide in the quaternary red earth soil were significantly higher than those in the granite red soil.The pH of the two red soils was positively correlated with total amount of base ions,exchangeable Ca^(2+)content,exchangeable Mg^(2+)content,calcium carbonate and base saturation,and negatively correlated with exchangeable acid,exchangeable H+content and exchangeable Al^(3+)content.

关 键 词：花岗岩风化物 第四纪红土 红壤 酸化 

分 类 号：S15[农业科学—土壤学]