Effects of desertification on soil organic C and N content in sandy farmland and grassland of Inner Mongolia
Effects of desertification on soil organic C and N content in sandy farmland and grassland of Inner Mongolia
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DOI：
10.1016/j.catena.2008.12.007
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发表时间：
2009-06
期刊：
影响因子：
6.2
通讯作者：
Halin Zhao;Yuhui He;R. Zhou;Yong-zhong Su;Yuqiang Li;Sam Drake
中科院分区：
文献类型：
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作者：
Halin Zhao;Yuhui He;R. Zhou;Yong-zhong Su;Yuqiang Li;Sam Drake
荒漠化是最严重的土地退化类型之一。2002年至2003年在中国科尔沁沙地进行了一次田间试验，研究了土壤C、N含量的变化与土地沙化的关系。从这项工作中得出了四个主要结果。首先，以风蚀为特征的土地沙漠化导致土壤细粒(粘粒+粉粒)显著减少，含沙量相应增加。与非沙化土地相比，严重沙化土地土壤细粒含量降低89.2%，沙粒含量增加47.2%。土壤有机碳和全氮主要与土壤细颗粒有关，并随着沙漠化的发展而显著降低。与非沙化土地相比，严重沙化土地有机碳减少29.2%，全N减少31.5%。沙化草地土壤有机C、N含量下降幅度大于沙化农田。第四，土壤有机碳和全氮含量的变化与土壤细粒含量呈显著正相关(P<；0.01)，与粗砂含量呈显著负相关(P<；0.01)，说明风蚀沙化是通过土壤细粒流失而导致土壤有机碳和全氮减少的。
Desertification is one of the most serious types of land degradation. A field experiment was conducted during 2002 and 2003 in Horqin Sand Land, China to investigate changes in soil C and N contents in relation to land desertification. Four primary results were derived from this work. First, land desertification characterized by wind erosion resulted in a significant decrease in soil fine particles (clay+silt) with a corresponding increase in sand content. In comparison to non-desertified land, soil fine particle content decreased by up to 89.2%, and sand content increased by up to 47.2%, in the severely desertified land. Second, the organic C and total N in soil were mainly associated with the soil fine particles, and decreased significantly with desertification development. Organic C decreased by 29.2% and total N by 31.5% in the severely desertified land compared to the non-desertified land. Third, the decrease in organic C and N content was greater in desertified grassland than in desertified farmland. Fourth, the changes in organic C and total N content had a significant positive correlation with the soil fine particle content (P<0.01) and a significant negative correlation with coarse sand content (P<0.01), indicating that land desertification by wind erosion is mediated through a loss of soil fine particles, with a resultant decrease in soil organic C and total N.