%0 Journal Article
%T Effects of different land use types on soil nutrients in karst region of Northwest Guangxi.<br>桂西北喀斯特移民区土地利用方式对土壤养分的影响
%A XU Lian-fang
%A WANG Ke-lin
%A ZHU Han-hua
%A HOU Ya
%A ZHANG Wei
%A <br>许联芳
%A 王克林
%A 朱捍华
%A 侯娅
%A 张伟
%J 应用生态学报
%D 2008
%I 
%X Selecting the main land use types (shrub land, secondary forest land, orchard, pasture land, and upland) at the peak-cluster depression in karst region of Northwest Guangxi as test objects, this paper studied the effects of different land use types on soil nutrients. The results showed that, the contents of soil organic matter (SOM), total N, and available N were 86%-155%, 62% -119%, and 66%-215% higher in shrub land and secondary forest land than in orchard, pasture land, and upland, respectively, i. e., increased with the decrease of land use intensity. The contents of soil total P and K were mainly controlled by their origins, but less affected by land use type. Soil available P content was mainly affected by fertilization, while soil available K content was controlled by vegetation cover and water- and soil loss. Land use type was the dominant factor affecting the contents of soil SOM, total N, and available N, P and K. Extensive cultivation could decrease soil nutrient contents and lead to the degradation of cropland soil, while ecological restoration could improve soil fertility. Therefore, in karst region, the measures as changing extensive cultivation into intensive farming, applying organic fertilizers, balance fertilization, and "Grain for Green Project" for > or = 25 degrees slope should be taken to recover and rebuild the eco-environment, and keep the sustainable utilization of land resources.
%K 喀斯特
%K 峰丛洼地
%K 土壤养分
%K 土地利用方式
%K 桂西北
%K 喀斯特地区
%K 移民区
%K 土地资源的可持续利用
%K 利用方式
%K 土壤养分
%K 影响
%K Northwest
%K Guangxi
%K region
%K karst
%K soil
%K nutrients
%K land
%K use
%K different
%K 生态环境
%K 重建
%K 植被恢复
%K 退耕还林还草
%K 坡耕地
%K 坡度
%K 平衡施肥
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=9EE05E3E26A952B89D6CBA446B7B674A&yid=67289AFF6305E306&vid=2A8D03AD8076A2E3&iid=94C357A881DFC066&sid=4D5C5090B0F83CF9&eid=5839F1C61E1C000D&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=23