%0 Journal Article
%T Changes of soil organic C and total N contents as affected by desertification in Horqin Sand Land, North China<br>科尔沁沙地沙漠化过程中土壤有机碳和全氮含量变化
%A ZHAO Ha-Lin
%A ZHOU Rui-Lian
%A SU Yong-Zhong
%A LI Yu-Qiang
%A <br>赵哈林
%A 周瑞莲
%A 苏永中
%A 李玉强
%J 生态学报
%D 2008
%I 
%X data, we analyzed changes of organic C and total N contents in relation to land desertification, compare difference of organic C and total N amount lost as affected by desertification between farmland and grassland. The results showed that soil C and total N concentration decreased significantly with increased desertified degrees, which decreased by 12.3% and 15.3%, 22.2% and 24.7%, 39.5% and 44.7%, 64.4% and 63.5% in the light, moderate, heavy and severe desertified farmland compared to undesertified farmland, and by 56.3% and 48.7%, 78.4% and 74.4%, 88.9% and 84.6%, 91.6% and 84.6% in the light, moderate, heavy and severe desertified grassland compared to undesertified grassland. Desertified areas was spreaded to 50197.5 km2 in 2000 in Horqin Sand Land, which total organic C and N amount lost by desertification was 36.39 Mt and 7.89 Mt, of which account for 91.12% and 86.06% in the desertified grassland, and for 8.88% and 13.94% in the desertified farmland, respectively. Correlation analysis indicated that the loss of soil organic C and N results mainly from decreased soil fine particles caused by wind erosion in the desertification process. So combating desertification to protect the farmland and grassland against wind erosion is very importance to decrease loss of C and N store in semiarid Horqin Sand Land.Key Words: semiarid areas; land desertification; organic C and total N; storages and lost amount
%K semiarid areas
%K land desertification
%K organic C and total N
%K storages and lost amount<br>半干旱区
%K 沙漠化
%K 有机碳
%K 全氮
%K 损失量
%K 科尔沁
%K 沙地
%K 沙漠化过程
%K 农田土壤有机碳
%K 全氮含量
%K 含量变化
%K Land
%K Sand
%K desertification
%K contents
%K total
%K N
%K organic
%K C
%K soil
%K 土壤风蚀
%K 防治
%K 粉粒
%K 氮的损失
%K 相关分析
%K 氮损失
%K 面积
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=17E4B701A5B7EB6DCA31256C213A7B8A&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=38B194292C032A66&sid=D5EB2E72DC098AA7&eid=49F8527D8162D0741059DB6B0E31B89A&journal_id=1000-0933&journal_name=生态学报&referenced_num=1&reference_num=26