摘要
喀斯特石漠化是喀斯特背景下的土地退化。文章对喀斯特高原区贵州省清镇市王家寨峰丛洼地同一流域内不同类型石漠化、不同等级石漠化以及不同干扰方式石漠化土壤重金属镉的含量变化及其空间分布特征进行了研究。结果表明:研究区土壤Cd含量在0.034～0.635mg·kg-1之间,平均值为0.243mg·kg-1。其中,黑色石灰土Cd含量普遍高于黄壤,且存在极显著性差异(P≤0.01)。土壤Cd含量总体随石漠化程度的加深而呈降低趋势,但除强度石漠化和轻度石漠化之间有显著性差异外(P≤0.05),其他石漠化等级之间无显著性变化。不同干扰方式石漠化之间,土壤Cd含量表现为开垦<放牧<火烧<樵采,其中,开垦与火烧、开垦与樵采在对土壤Cd含量的影响上存在显著性差异(P≤0.05)。土壤Cd含量在不同坡位间无明显变化规律,也无显著差异。研究区土壤Cd含量受土壤组分、有机质、pH和CEC等诸多因素的影响,其中,土壤有机质、pH和土壤组分是其主要影响因素。
Karst rocky desertification is a kind of land degradation. This article discussed the element contents changes and spatial distribution characteristic of Cd in the surficial soil of the karst rocky desertification area, including different type, different grade and different disturbed modes karst rocky desertification within the same small catchment, which belong to the Wangjiazhai peak-cluster depression basin, located in Qingzhen city, Guizhou province. The results showed that the contents of soil Cd is between 0.034～0.635 mg·kg-1 with the mean value of 0.243 mg·kg-1 in the researched area. Among them, the black calcareous soils have higher Cd concentration than that of yellow soil and showed the most significant difference （P≤0.01）. The concentration of Cd is going down with the degree of karst rocky desertification on the whole, but there have no significant difference except between the strong karst rocky desertification and slightly karst rocky desertification （P≤0.05）. Meanwhile, between the rocky desertification with different disturbed modes, the concentration of Cd has a rule： reclaimed 〈 browsed 〈 fired 〈 lumbered, and there is a significant difference between reclaimed and fired, as well as that between reclaimed and lumbered （P≤ 0.05）. The concentrations of Cd among the different slope position have no obvious variation law, no significant difference either. The concentration of Cd in this study area is affected by some factors, such as soil component, organic matter, pH and CEC,of which the organic matter, pH and soil component are the most important factors.
出处
《生态环境学报》
CSCD
北大核心
2009年第1期160-166,共7页
Ecology and Environmental Sciences
基金
国家重点基础研究发展计划项目(2006CB403200)
中国科学院知识创新工程重要方向项目(kzcx2-yw-306)
中国科学院知识创新领域前沿项目(IG-04-01)
国家自然科学基金面上项目(40672112)
关键词
喀斯特石漠化
土壤重金属
镉
地球化学特征
Karst rocky desertification
Soil heavy metal
Cadmium
geochemical characteristics
作者简介
罗绪强（1976年生），男，讲师，博士研究生，研究方向为环境地球化学。E-mail：xuqiangluo@r163．com
责任作者，E-mail：Wangshijie@vip．skleg．cn
