喀斯特石漠化区植被演替过程中土壤质量研究——以广西都安澄江小流域为例  

Research on the Soil Quality during the Vegetation Succession Process in Karst Rocky Desertification Area

作　　者：廖赤眉[1] 胡宝清[2] 苏广实[3] 莫玉凤[2] 

机构地区：[1]北京师范大学地理与遥感科学学院,北京100875 [2]广西师范学院资源与环境科学学院,广西南宁53000 [3]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,贵州贵阳550002

出　　处：《安徽农业科学》2009年第35期17626-17629,共4页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金(40661005;40871250);广西自然科学基金项目(0731068;0832021Z);教育部新世纪优秀人才支持计划项目(NCET-06-0760)

摘　　要：采用空间序列代替时间序列的方法,研究喀斯特石漠化区植被演替过程中土壤质量变化特征。以广西都安澄江小流域为例,选取4个植物演替阶段,即乔木、灌丛、灌草丛、草丛的典型样地,对该地区土壤理化性质进行分析,研究植被演替对土壤质量特征的影响。结果表明:在石漠化地区植被演替过程中,土壤含水量、pH值、有机质、氮、磷、钾等含量均有一定程度的下降。导致这一变化的主要原因是植被生长情况、土壤养分积累能力等。The characteristic of soil quality during the vegetation succession process about rocky desertifieation in Karst regions of Guangxi was studied by using the method of the spatial sequence instead of the time series. Taking Chengjiang small watershed in Du＇ an County of Guangxi was chosen as an example, four stages of the reversal succession process about rocky desertification were chosen, including the typical plots of the arbor, shrub, bushes and short grass. The chemical and biological characters of soil and further discuss repair state of soil quality during the vegetation succession process about rocky desertification were studied. The results showed that different succession stage led to the remarkable discrepancy of the chemical and biological character of soil. With the improvement of each soil index during the developing process of the vegetation to higher stage, soil quality generally presents improved state. With the positive succession of vegetation, soil quality presented the rising trend. The positive evolution of natural vegetation was an effective path of improving the soil quality and it just contrasted with the process of rocky desertification.

关 键 词：土壤质量 植被演替 石漠化 澄江小流域 广西都安 

分 类 号：S154.1[农业科学—土壤学]