放牧强度对高寒混播草地土壤养分含量的影响  

Effects of Grazing Intensity on Soil Nutrition in the Alpine Mixed-sown Grassland

作　　者：董全民[1] 赵新全[2] 马玉寿[1] 

机构地区：[1]青海省畜牧兽医科学院,青海西宁810016 [2]中国科学院西北高原生物研究所,青海西宁810001

出　　处：《土壤通报》2008年第3期553-557,共5页Chinese Journal of Soil Science

基　　金：国家“十五”科技攻关计划重大项目(2001BA606A-02);2005年度青海三江源自然保护区生态保护和建设总体规划科研课题及应用推广招标项目(2005-SN-1);国家“十一五”科技支撑计划重大项目(2006BAC01A-02)

摘　　要：垂穗披碱草/星星草混播草地三个放牧季的牦牛放牧试验结果表明:①放牧强度和土壤层深度对有机质含量的影响均达到极显著的水平(P<0.01),且土壤有机质含量随放牧强度的增加呈下降趋势;②放牧强度对土壤速效氮和速效磷的影响不显著(P>0.05),对速效钾的影响显著(P<0.05);不同土壤层速效氮和速效钾含量之间的差异显著(P<0.05),速效磷含量之间的差异不显著(P>0.05)。The result of grazing trial for three grazing seasons in a mixed-sown grassland for Elymus natans/Puccinellia tenuflora showed： （1） Effects of grazing intensity and soil depth on soil organic matter contents were extremely significant （P〈0.01）, and contents of soil organic matter reduced with the increased grazing intensity; （2） As for available nutrition, the influence of grazing intensity on the contents of N and P in the same soil depths was not significant （P〉0.05）, but it was significant （P〈0.05） for available K. This lied in significant difference of available N and K in the different soil depths within the same grazing plot （P〈0.05）.

关 键 词：放牧强度 高寒混播草地 有机质 速效N 速效P 速效K 

分 类 号：S158[农业科学—土壤学] S812.8[农业科学—农业基础科学]