水土保持研究2018，Vol.25Issue(2)：157-161,5.
花岗岩风化壳崩岗侵蚀剖面风化强度和粒度分布特征
Characteristics of Grain Size and Weathering Intensity of Collapsing Erosion Profile in Granite Weathering Crust
摘要
Abstract
Collapsing hill erosion profile of granite weathering crust was analyzed by combining the grain size method and chemical weathering index method.The results showed that:(1) the silt gravel component was the highest,whose the average value is 52.52％,the sand gravel component was 38.38％,the lowest clay gravel component was 9.09％.The silt gravel component (4～63 tμm) was correlation with fine clay gravel component (＜1 μm) and clay gravel component (＜4 tμm),and the sand gravel component (＞63 tμm) had the significant positive correlation with median gravel diameter,the sand gravel component (＞63 tμm) had a significant negative correlation with fine clay gravel component (＜1 tμm),the clay gravel component (＜4 μm),and the silt gravel component (4～63 tμm).The coarse grain size combination of depth from 580 to 780 cm might be the original area of the collapse erosion;(2) chemical index of alteration (CIA),coefficient of weathering leaching (BA),eluvial coefficient (Ki) and alkali index (Bc) show that the chemical weathering degree of collapse hill erosion profile was high;the weathering intensity shows a trend of slightly decreasing and then increasing from the bottom to the top of profile;(3) the correlation among chemical weathering parameters and particle size shows that when chemical weathering intensity enhances,the components of the fine clay gravel (＜1 μm),the clay gravel (＜4 μm) and the silt gravel (4～63 μm) should increase,while that of sand gravel component (＞63 μm) would decreae;when the chemical weathering intensity reduces,the component of the fine clay gravel (＜1 μm),the clay gravel (＜4 μm) and the silt gravel (4～63 μm) should decrease,the sand gravel (＞63 μm) component would increase.关键词
花岗岩风化壳/崩岗侵蚀/风化强度/粒度组成Key words
granite weathering crust/collapsing hill erosion/weathering intensity/grain size composition分类
农业科技引用本文复制引用
熊平生,袁航..花岗岩风化壳崩岗侵蚀剖面风化强度和粒度分布特征[J].水土保持研究,2018,25(2):157-161,5.基金项目
湖南省自然科学基金(2016JJ6015) （2016JJ6015）
国家自然科学基金(41471153) （41471153）
衡阳师范学院样科学基金项目(15B10) （15B10）
