摘要
比较研究了锡林郭勒典型草原不同放牧强度下土壤微生物数量的分布特征。平板计数的结果表明：在0~10cm和10~20cm土层中,土壤好气性细菌（Aerophilebacteria）和放线菌（Actinomycetes）数量均表现为放牧3d（G3）〉不放牧（G5）〉放牧12d（G1）样地的趋势;好气性细菌数量在0~10cm土层中,放牧3d与放牧12d和不放牧样地之间有显著性差异;在10~20cm土层,放牧3d和不放牧与放牧12d之间有显著性差异。放线菌数量在0~10cm和10~20cm土层中均为放牧3d与放牧12d之间有显著性差异。土壤真菌数量在0~10cm土层中,放牧12d〉放牧3d〉不放牧,其中放牧3d比不放牧增加5.88%。可见,适当放牧有助于土壤微生物数量的增加,而过度放牧会导致土壤微生物数量明显减少。
Distribution characteristics of the number of soil microorganisms under different grazing intensity in Xilingol typical steppe was investigated.The results showed that the total aerophile bacteria and actinomycetes numbers in the 0～10 cm and 10～20 cm soil depth were in the order of grazing for 3 days no grazing grazing for 12 days.In 0～10 cm soil depth,aerophile bacteria numbers had significant differences among grazing for 3 days,grazing for 12 days and no grazing;In 10～20 cm soil depth,there were significant differences in number of aerophile bacteria among grazing for 3 days,grazing for 12 days and no grazing.In 0～10 cm and 10～20 cm soil depth,there were significant differences in actinonycetes number between grazing for 3 days and grazing for 12 days.The number of fungi in 0～10 cm soil depth was in the order of grazing for 12 days grazing for 3 days no grazing.Fungi number in grassland grazing for 3 days were increased by 5.88% than that in no grazing.Conservative grazing was beneficial to increase of soil microorganisms,but heavy grazing resulted in the reduction of soil microorganisms.
出处
《中国草地学报》
CSCD
北大核心
2011年第2期63-68,共6页
Chinese Journal of Grassland
基金
农业部现代农业产业技术体系建设专项及公益性行业(农业)科研专项(No.200803060)
国家"973"计划前期研究专项(No.2009CB125909)
国家自然科学基金项目(No.31060076
No.40861002)
关键词
典型草原
放牧强度
土壤微生物
Typical steppe
Grazing intensity
Soil microorganisms
