广西岩溶地区水稻土发生特性及其在中国土壤系统分类中的归属  

Genetic Characteristics of Paddy Soils in Karst Areas of Guangxi and Their Attribution in Chinese Soil Taxonomy

作　　者：欧锦琼 卢瑛[2] 胡丹心 周志军 秦海龙[2] 熊凡 阳洋 OU Jinqiong;LU Ying;HU Danxin;ZHOU Zhijun;QIN Hailong;XIONG Fan;YANG Yang(Guangzhou Sub-branch of Guangdong Ecological and Environmental Monitoring Center,Guangzhou 510006,China;College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]广东省广州生态环境监测中心站,广州510006 [2]华南农业大学资源环境学院,广州510642

出　　处：《土壤》2023年第6期1336-1346,共11页Soils

基　　金：国家科技基础性工作专项重点项目(2014FY110200);国家自然科学基金项目(41271233);广州市科技计划项目(202103000018)资助。

摘　　要：为明确广西岩溶地区水稻土在中国土壤系统分类中的归属,以该区域不同母质发育的水稻土为研究对象,挖掘20个典型剖面,通过野外观测、分层取样与分析,依据《中国土壤系统分类检索(第三版)》进行分类检索。结果表明,大多剖面出现明显的复钙现象。供试剖面的系统分类高级单元归属为人为土土纲;水耕人为土亚纲;潜育、铁聚和简育水耕人为土3个土类;复钙、铁聚和普通潜育水耕人为土,复钙和普通铁聚水耕人为土,复钙和普通简育水耕人为土7个亚类;在系统分类基层单元归属上,可划归出17个土族和续分为20个土系。考虑广西地区水耕人为土耕作层Ap1碳酸钙相当物含量往往低于犁底层Ap2的现象,而现行水耕人为土复钙亚类的检索中“表层土壤”的“表层”不尽明确而可能导致的亚类误判,建议将其修改为“水耕表层(耕作层或犁底层)土壤”;另外,由于实际调查发现广西地区的一些铁聚水耕人为土也具有复钙特征,建议在检索中增设复钙铁聚水耕人为土亚类。To clarify the classification of paddy soils in Karst areas of Guangxi in Chinese Soil Taxonomy,20 typical soil profiles of paddy soil with different parent materials were selected and classified according to Chinese Soil Taxonomy(3rd ed)by field observation,stratified sampling and analysis.Results showed that there was obvious recalcification in most of the paddy soils.The selected profiles were sorted into Anthrosols in order;Stagnic Anthrosols in suborder;Gleyic,Fe-accumulic and Hapli-Stagnic Anthrosol in group;Recalcatic,Fe-accumulic and Typic Gleyi-Stagnic Anthrosols,Recalcatic and Typic Fe-accumulic-Stagnic Anthrosols,Recalcatic and Typic Hapli-Stagnic Anthrosols in subgroup.They were classified as 17 soil families and 20 soil series.In consideration of that CaCO3 equivalent content is lower in the cultivated layer of Stagnic Anthrosols in Guangxi than that in the plow pan,it is suggested to revise“the surface layer”of“topsoil”in the current classification of subgroup of Stagnic Anthrosols as Anthrostagnic epipedon(cultivated layer or plow pan)to prevent the misjudgment of subgroup.Meanwhile,it is suggested to add a subgroup of Recalcatic Fe-accumulic-Stagnic Anthrosols in Chinese Soil Taxonomy due to some of the artificial soils in Guangxi also have the characteristics of calcic evidence.

关 键 词：广西 岩溶地区 水稻土 发生特性 土壤系统分类 

分 类 号：S155.3[农业科学—土壤学]