利用强度对荒漠草原土壤氮循环系统的影响  

Effect of grazing intensity on soil nitrogen cycle in the desert steppe

作　　者：高雪峰[1] 韩国栋[2] 

机构地区：[1]内蒙古师范大学生命科学与技术学院,呼和浩特010022 [2]内蒙古农业大学生态环境学院,呼和浩特010018

出　　处：《干旱区资源与环境》2011年第11期165-168,共4页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(30360022)资助

摘　　要：随着气候的变化和人类的干扰,草原退化日趋严重。文中研究了内蒙古荒漠草原不同利用强度下土壤中4类氮素转化菌,以及土壤的固氮作用、氨化作用和硝化作用强度。结果表明,轻牧区土壤中4类氮素转化菌的数量显著增加(P>0.05),也显著加强了土壤中的固氮作用、氨化作用和硝化作用。有利于促进土壤的氮循环;重度利用则导致草原土壤中氮素转化菌数量显著降低(P>0.05),减弱了土壤中的固氮作用和氨化作用,抑制土壤的氮循环的进程。With climate change and human disturbance,grassland degradation is worsening.In this paper,we studied four kinds of soil nitrogen decomposing bacteria and nitrogen fixation,ammonification and nitrification of different using intensity in Inner Mongolia steppe desert.The results showed that the number of four categories of soil nitrogen bacteria increased significantly in light grazing（P0.05）,also soil nitrogen fixation,ammonification and nitrification significantly increased.Light grazing contributed to the soil nitrogen cycle.heavy use of grassland led to soil nitrogen bacteria was significantly lower（P0.05）,the soil nitrogen fixation and ammonification were reduced,the process of soil nitrogen cycle was inhibited.

关 键 词：利用强度 荒漠草原 土壤 氮循环 

分 类 号：S154[农业科学—土壤学]