Chinese Journal of Applied Ecology. 2010, (01) Core

Content and evolution characteristics of organic carbon associated with particle-size fractions of grey desert soil under long-term fertilizationChinese Full Text

LIU Hua1,TONG Xiao-gang2,MA Xing-wang1,WANG Xi-he1,ZHANG Wen-ju2,XU Yong-mei1,XU Ming-gang2 (1Institute of Soil,Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences,Urumqi 830000,China;2Ministry of Agriculture Key Laboratory of Plant Nutrition and Fertilization,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China)

Abstract: Physical fractionation technique was used to analyze the content,distribution,and temporal evolution of organic carbon associated with particle-size fractions of grey desert soil under long-term （1990-2007） fertilization.Compared with no fertilization,a combined application of manure and chemical fertilizers increased the organic carbon associated with particle-size fractions significantly,with the highest increment （0.34 g·kg-1·a-1） in sand.Fallowing also increased the organic carbon associated with clay and silt significantly.Straw return to cropland only maintained the organic carbon content in different particle-size fractions,while long-term application of chemical fertilizers was not beneficial to the organic carbon increase in particle-size fractions.Coarse silt and coarse clay had the highest distribution rates of organic carbon （27.9% and 27.1%,respectively）,being the important fractions in sequestrating organic carbon.When manure was applied with chemical fertilizers,the organic carbon in sand was significantly increased by 119.4%,while that in fine silt and coarse clay was significantly decreased by 40.3% and 37.9%,respectively,which resulted in the increase in the ratio of particulate organic carbon content （WPOC） to mineral-associated organic carbon content （WMOC）,and improved soil carbon property.Long-term application of manure combined with chemical fertilizers was the best mode to increase the organic carbon content in particle-size fractions and improve the fertility of grey desert soil.

Keywords：

long-term fertilization; gray desert soil; organic carbon associated with particle-size fractions; evolution characteristics;

DOI：
10.13287/j.1001-9332.2010.0049
Series：
Subject：
Classification Code：
S153.621

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