华北农牧交错带地区放牧强度对草地土壤氮营养的影响  

Effects of Grazing Intensity on Soil Nitrogen Nutrient in the Agro-pastoral Transitional Zone of North China

作　　者：张蕴薇[1] 韩建国[1] 杨富裕[1] 

机构地区：[1]中国农业大学草地研究所,北京100094

出　　处：《四川草原》2005年第1期7-9,共3页Journal of Sichuan Grassland

基　　金：国家重点基础研究发展规划项目(G20000018606)

摘　　要：以放牧2年的改良新麦草草地为对象,对放牧期间及停牧后不同放牧强度区土壤全氮、铵态氮、硝态氮、微生物量氮含量变化进行研究.结果表明,在华北农牧交错带地区,放牧草地土壤氮水平与放牧强度紧密相关.在放牧期间,0～10 cm和10～20 cm土层,各项指标均随放牧强度增加而增加,停牧后,各处理间差异缩小,表明放牧强度对土壤氮水平的影响有较强的现时性,而且重牧区土壤氮营养水平呈现下降趋势.Based on Russian wildryegrass (Pasathyrostachys juncea) pasture of North China, grazed two years, the effects of different grazing intensities on soil nitrogen nutrient during grazing and after inhibited grazing were studied. The results showed the level of pasture soil nitrogen significantly correlated with grazing intensity. During grazing period, the content of soil total nitrogen, NO3-N, NH4-N, micro-biomass nitrogen for 0-20cm soil increased with grazing intensity increasing. After stopping grazing, the difference among different treats reduced. Meanwhile, the soil nitrogen for heavy grazing pasture had a downtrend.

关 键 词：放牧强度 土壤 氮 

分 类 号：S812.2[农业科学—草业科学]