草业学报2012，Vol.21Issue(2)：1-7,7.
呼伦贝尔沙质草地土壤理化特性的沙漠化演变规律及机制
Desertification mechanisms and process of soil chemical and physical properties in Hulunbeir sandy grassland, Inner Mongolia
摘要
Abstract
A field investigation on soil chemical and physical properties in different kinds of desertified grassland was conducted during 2009 in the Chenbaer Banner,Hulunbuir Sand Land of Inner Mongolia to understand desertification mechanisms and processes in grassland soils.The results showed that,1) With developing desertification,fine particles (clay and silt) in soil decreased significantly while sand increased significantly,giving a courser soil texture,Loss of soil fine particles was most serious in moderate desertification;2) In the desertification process,changes in soil bulk density and soil temperature were not significant,but soil hardness decreased significantly and soil moisture increased slightly;3) Land desertification resulted in a reduction of soil organic carbon,soil nitrogen and phosphorus,while C/N and soil pH decreased synchronously;4) Changes of soil organic and nutrient content had a significant positive correlation with soil clay and silt contents,while soil hardness had a significant positive correlation with soil fine particles and organic matter.Relativity in soil bulk density,soil temperature and soil moisture with soil texture was not significant;5) In the desertification process,loss of soil clay and silt was the primary mechanism to cause soil coarseness and resulted in a reduction of soil hardness,soil organic carbon and nutrient contents,with lesser effects on soil bulk density,soil temperature and moisture in Hulunbeir sandy land.关键词
沙漠化/土壤理化特性/变化机制/呼伦贝尔沙地Key words
desertification/soil chemical and physical properties/changed mechanisms/Hulunbeir sandy grassland分类
农业科技引用本文复制引用
赵哈林,周瑞莲,赵学勇,张铜会,王进..呼伦贝尔沙质草地土壤理化特性的沙漠化演变规律及机制[J].草业学报,2012,21(2):1-7,7.基金项目
国家科技支撑项目(2011BACO7B02),国家973课题(2009CB421303)和国家自然科学基金课题(30972422)资助. （2011BACO7B02）
