草地学报

›› 2003, Vol. 11 ›› Issue (4): 343-345,342.DOI: 10.11733/j.issn.1007-0435.2003.04.014

• 研究论文 • 上一篇    下一篇

不同放牧强度下人工草地土壤微生物量碳、氮的含量

张蕴薇1, 韩建国1, 韩永伟2, 牛忠联2   

  1. 1. 中国农业大学草地研究所, 北京, 100094;
    2. 中国环境科学院, 北京, 100012
  • 收稿日期:2003-01-28 修回日期:2003-11-01 出版日期:2003-11-15 发布日期:2003-11-15
  • 作者简介:张蕴薇(1974- ),女,博士,蒙古族,从事草地生态及牧草育种方向的教学与科研,已发表论文6篇
  • 基金资助:
    国家重点基础研究发展规划项目(G20000018606)资助

The content of soil Micro-biomass Carbon and Nitrogen of Different Grazing Intensities on Pasture

ZHANG Yun-wei1, HAN Jian-guo1, HAN Yong-wei2, NIU Zhong-lian2   

  1. 1. Institute of Grassland Science, China Agricultural University, Beijing 100094, China;
    2. Chinese Academy of Environment Science, Chengde 365000, China
  • Received:2003-01-28 Revised:2003-11-01 Online:2003-11-15 Published:2003-11-15

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摘要： 试验测定了华北农牧交错带地区不同放牧强度下(轻牧,6只羊/hm2;中牧,10只/hm2;重牧,13只/hm2)人工草地土壤微生物量碳、氮含量的变化。结果表明:在不同放牧强度下,微生物量碳氮有相似的变化趋势,放牧期间均以中牧区较高,在停牧年,以轻牧区和对照区较高;随着放牧时间延长及环境条件恶化,土壤微生物量碳氮含量随放牧强度增加而迅速降低;从微生物量碳氮随放牧强度变化的角度,在干旱地区放牧强度不宜高于轻牧。

关键词: 放牧强度, 草地, 微生物量碳, 微生物量氮

Abstract: A test was conducted to determine the content of soil micro-biomass carbon and nitrogen on cultured pastures of northern China’s agro-pastoral zone,which are divided into three cites of different grazing intensities:light(6 sheep/hm2),medium(10 sheep/hm2),and heavy(13 sheep/hm2).The result shows that different grazing intensities tend to affect the soil microbial biomass of carbon and nitrogen in similar ways. During the grazing period,the soil microbial biomass of the two elements is higher in pastures of medium grazing intensity,while during the rest-grazing period,they are higher in pastures of light grazing intensity and in the control sites.Following the prolonged grazing and deterioration of the environment,the pasture soil micro-biomass carbon and nitrogen decrease incessantly.Judging from the worsening situation,we suggest the grazing-intensity limit in an arid area should be restricted at 6 sheep per square hectometer.

Key words: Grazing intensity, Pasture, Microbial biomass-carbon, Microbial biomass-nitrogen