黄土丘陵区生物结皮对土壤抗蚀性的影响  

Effects of Biological Crusts on Soil Anti-erodibility in Loess Hilly Areas

作　　者：李聪会[1] 朱首军[1] 陈云明[2] 于萌 马笑[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所,陕西杨凌712100 [3]新疆绿疆源生态工程有限责任公司,乌鲁木齐830000

出　　处：《水土保持研究》2013年第3期6-10,共5页Research of Soil and Water Conservation

基　　金："十二五"国家科技支撑计划"梁峁丘陵沟壑区农田耕作及林草生物措施防蚀关键技术集成与示范"(2011BAD31B05-02)

摘　　要：以黄土丘陵区不同发育年限的生物结皮为研究对象,通过对保留生物结皮、去除生物结皮两种处理下土壤的崩解性、抗剪强度的比较,分析生物结皮对土壤抗蚀性的影响。结果表明:(1)生物结皮可以增强土壤抗崩解性能,随着发育年限的增加,崩解量减少,减少量从21.85%至43.46%递增。(2)生物结皮可以提高土壤抗剪强度,提高率为17.91%～23.45%,并与发育年限成正相关关系。(3)土壤崩解量与抗剪强度呈线性负相关,生物结皮对土粒间相互作用力的增强可以降低水分对土粒的分散作用,崩解量随抗剪强度的变化率较小。In order to study the effects of biological crusts forming in different development periods in loess hilly areas on soil anti-erodibility,the differences of soil disintegration and soil anti-shear strength under two different treatments,retention of biological crust and removal of biological crust were analyzed.The results were as followings：（1） the formation of biological crusts can reduce the soil disintegration quantity,with the development of biological crusts,the influence degree improved from 21.85% to 43.46%;（2） the formation of biological crusts can improve the anti-shear strength of soil at the rate of 17.91%~23.45%,and the development of biological crusts has the positive correlation with soil anti-shear strength;（3） soil disintegration quality had the negative linear correlation with soil anti-shear strength.As the biological crust can enhance the soil particle interaction,the effect of moisture on soil particle dispersion was reduced,which made the rate of change of soil disintegration to anti-shear strength reduced.

关 键 词：生物结皮 土壤抗蚀性 土壤崩解 抗剪强度 

分 类 号：S154[农业科学—土壤学] S157[农业科学—农业基础科学]