摘要
黄河源区由于过度放牧,引起高寒草甸不同程度的沙漠化。随沙漠化程度的增加,容重和pH值逐渐升高,有机碳(SOC)和全氮(N)逐渐降低。在不同土壤层的分布中,容重和pH值的分布特征为:0-10 cm<10-20 cm<20-30 cm,SOC和全N的分布特征为:0-10 cm>10-20 cm>20-30 cm。适度放牧有利于SOC和全N的积累,过度放牧容易引起土壤沙漠化,阻碍畜牧业的可持续发展。
Desertification in study area is mainly resulted from overgrazing. With the development of desertification, bulk density and pH value increase, soil organic carbon （soc） and total N reduce. At different soil layers, bulk density and pH value decline with sequence of soil layers under 0 - 10cm, 10 -20cm and 20 -30em, while the content of SOC and total N accrete in the corresponding layers. Moderate grazing is conducive to accumulate SOC and total N. Overgrazing tends to deteriorate soil potential and hamper sustainable development of animal husbandry.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2009年第8期155-159,共5页
Journal of Arid Land Resources and Environment
基金
国家973项目"干旱区绿洲化
荒漠化过程及其人类活动
气候变化的响应与调控(2009CB421300)"资助
关键词
高寒草甸
沙漠化
土壤理化性质
desertification
soil physiochemical properties
