喀斯特地区黄壤和石灰土剖面化学组成变化与风化成土过程  

Major and Trace Element Compositions of Yellow and Limestone Soils in the Karst Area of Southwest China:Implications for Weathering and Soil-formation Processes

作　　者：刘文景[1,2] 涂成龙[1] 郎赟超[1] 冯家毅[1,2] 李龙波[1,2] 汪齐连[1] 刘丛强[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]中国科学院研究生院,北京100049

出　　处：《地球与环境》2010年第3期271-279,共9页Earth and Environment

基　　金：国家重点基础研究发展计划(973计划)项目(2006CB403200);国家自然科学基金创新群体项目(40721002);中科院西部之光项目

摘　　要：对西南喀斯特地区典型黄壤和石灰土剖面土壤主量和微量元素组成变化特征进行了研究,提供了有关岩石风化和土壤形成过程的信息。所研究的土壤相对于上地壳普遍富集P和Mn,而亏损Na、K、Ca、Mg元素。与黄壤相比,石灰土具有较高含量的K、Rb和较低含量的Sr元素,同时具有较高Th/Ta,Rb/Sr比值和CIA的特征,指示两类土壤成土母质的差别和石灰土较强的风化程度。不同地区同种类型土壤以及同一地区不同类型土壤的化学组成具有显著差别,反映了不同区域和不同类型土壤在成土母质、风化成土过程和程度上的差异。Typical yellow and limestone soil profiles in the karst areas of Southwest China, were studied for major and trace ele- ment contents, which provides the information about the crustal weathering and soil formation process. The soils studied showed that the contents of P and most Mn in the samples are higher than the average values of upper continental crust （UCC）, while the contents of Na, K, Ca, Mg are lower. Compared with the yellow soil profiles, the limestone soil profiles have higher contents of K and Rb, but lower contents of Sr,higher Th/Ta and Rb/Sr ratios and CIA, which together present the difference in parent material and stronger weathering of the limestone soils. It is concluded that the same type of soils in dif- ferent sampling areas and the different types of soils in one sampling area show significantly variations in major and trace ele- ment compositions, resulting from the different parent materials and soil formation processes and degrees of weathering in the different areas.

关 键 词：喀斯特地区 黄壤剖面 石灰土剖面 主量元素 微量元素成土过程 

分 类 号：S151[农业科学—土壤学] P595[农业科学—农业基础科学]