不同生态脆弱区土壤侵蚀对土地生产力影响对比研究  

Soil Erosion and Its Relations to Slope Field Productivity in Hilly Gully Area of Loess Plateau and Dry-hot Valley of Jinshajiang River

作　　者：陈奇伯[1] 王克勤[1] 齐实[2] 李金洪 吴晓伟 

机构地区：[1]西南林学院环境科学系,云南昆明650224 [2]北京林业大学水土保持学院,北京100083 [3]云南省元谋县水保办,云南元谋675000 [4]宁夏西吉县农田建设办公室,宁夏西吉756200

出　　处：《水土保持通报》2005年第3期29-32,共4页Bulletin of Soil and Water Conservation

基　　金：云南省教育基金项目(02ZY059);云南省自然科学基金重点项目(2001D00082Z);国家"九五"科技攻关项目(96-004-05-10)

摘　　要：通过外业调查、实验测试、大田模拟试验等方法,在土壤侵蚀特征分析基础上,对黄土丘陵和金沙江干热河谷2个生态脆弱区由于土壤侵蚀导致的坡耕地土地生产力衰退进行了对比研究。结果显示,不同生态脆弱区无任何水土保持措施的坡耕地土壤侵蚀,在导致可耕作土层变薄的同时,都造成了不同程度的土壤物理性能和入渗能力下降,土壤养分流失以及土地生物生产能力的衰退。相同强度土壤侵蚀对坡耕地土地生产力的影响,干热河谷区大于黄土丘陵区,是黄土丘陵区的2.1～2.9倍。<Abstrcat> Soil erosion properties are analyzed to determine the impacts of soil erosion on land productivity in the Loess Plateau and the Dry-hot Valley of Jinsha River. Analysis methods used include field survey, laboratory experiments and simulation tests. Results show that soil erosion on sloping fields not only causes soil nutrient loss, but also causes degradation of soil physical properties and diminished soil infiltration capability. The consequence of theses changes brought by soil erosion is a reduction in land productivity. The impacts of similar soil erosion on the productivity of land in the Dry-hot Valley are more severe than those in the Loess Plateau, averaging 2.1 to 2.9 times more serious.

关 键 词：黄土丘陵 干热河谷 坡耕地 土壤侵蚀 土地生产力 

分 类 号：S157[农业科学—土壤学] F301.24[农业科学—农业基础科学]