Desertification mechanisms and process of soil chemical and physical properties in Hulunbeir sandy grassland, Inner Mongolia

Abstract

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.

CLC Number:

S812.2
S153

ZHAO Ha-lin, ZHOU Rui-lian , ZHAO Xue-yong, ZHANG Tong-hui, WANG Jin. Desertification mechanisms and process of soil chemical and physical properties in Hulunbeir sandy grassland, Inner Mongolia[J]. Acta Prataculturae Sinica, 2012, 21(2): 1-7.

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