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贵州省碳酸盐岩地区土壤允许流失量的空间分布
引用本文:李阳兵,王世杰,魏朝富,龙健.贵州省碳酸盐岩地区土壤允许流失量的空间分布[J].地球与环境,2006,34(4):36-40.
作者姓名:李阳兵  王世杰  魏朝富  龙健
作者单位:1. 贵州师范大学地理与生物科学学院,贵州,贵阳,550001
2. 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
3. 西南大学资源环境学院,重庆,400716
基金项目:教育部跨世纪优秀人才培养计划;贵州省科研项目;国家自然科学基金
摘    要:根据决定上覆土层厚度的碳酸盐岩建造中的泥质含量,贵州碳酸盐岩地区的岩石组合类型可分为连续性碳酸盐岩组合、碳酸盐岩夹碎屑岩组合、碳酸盐岩与碎屑岩互层组合,按贵州碳酸盐岩的风化溶蚀速率平均值49.67 mm/ka计算了碳酸盐岩不同岩石组合类型的成土速率,并以此作为相应岩石类型地区的土壤允许流失量。连续性碳酸盐岩组合地区土壤允许流失量小于6.84 t/(km2.a),为土壤侵蚀极度敏感区;碳酸盐岩夹碎屑岩组合地区土壤允许流失量小于45.53 t/(km2.a),为土壤侵蚀重度敏感区;碳酸盐岩与碎屑岩互层组合地区土壤允许流失量小于103.46 t/(km2.a),为土壤侵蚀中度敏感区。说明贵州碳酸盐岩地区的土壤侵蚀分级标准存在空间分异。强度石漠化主要分布在土壤允许流失量小于6.84 t/(km2.a)的连续性碳酸盐岩地区,尤其是连续性石灰岩地区分布最广。

关 键 词:土壤允许流失量  碳酸盐岩地区  贵州省
文章编号:1672-9250(2006)04-0036-05
收稿时间:2006-05-10
修稿时间:2006-09-14

THE SPATIAL DISTRIBUTION OF SOIL LOSS TOLERANCE IN CARBONATE AREA IN GUIZHOU PROVINCE
LI Yang-bing,WANG Shi-jie,WEI Chao-fu,LONG Jian.THE SPATIAL DISTRIBUTION OF SOIL LOSS TOLERANCE IN CARBONATE AREA IN GUIZHOU PROVINCE[J].Earth and Environment,2006,34(4):36-40.
Authors:LI Yang-bing  WANG Shi-jie  WEI Chao-fu  LONG Jian
Abstract:According to the amount of argillaceous material in formations that determines the surface soil thickness,the petrologic assemblages in carbonate area in Guizhou Province can be divided into three types: homogenous carbonate rock,carbonate rock intercalated with clastic rocks,and carbonate/clastic rock alternations.With the average weathering dissolving rate of carbonate rocks in Guizhou being 49.67 mm/ka,the pedogenesis rates of different petrologic assemblages in carbonate area have been calculated and used as the value of soil loss tolerance in carbonate areas.The soil loss tolerance in homogenous carbonate rocks area is lower than 6.84 t/(km~2·a),45.53 t/(km~2·a) in carbonate rock intercalated with clastic rock areas and 103.46 t/(km~2·a) in carbonate/ clastic rock alternations areas.Therefore,this three area are utmost sensitive,severe sensitive and moderate sensitive to soil erosion separately in these carbonate areas.As a result,there exists a spatial heterogeneity of the classification indices for soil erosion intensity in carbonate areas of Guizhou Province.Karst rocky desertification is predominately distributed in homogenous carbonate assemblages whose soil loss tolerance is lower than 6.84 t/(km~2·a),especially,in homogenous limestone assemblage.
Keywords:soil loss tolerance  carbonate rock area  Guizhou Province
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