摘要
不同利用方式下(刈割和放牧),比较了羊草(Leymus chinensis)草地土壤微生物多样性(真菌、细菌和放线菌)及群落结构的数量变化。结果表明:土壤微生物的数量在不同利用方式下表现为:刈割草地>放牧草地,在不同植物群落中表现为:羊草群落>杂类草群落>碱茅(Puccinellia distans)群落。无论在刈割还是放牧区,真菌的分布为:羊草群落>杂类草群落>碱茅群落;细菌的分布为:杂类草群落>羊草群落>碱茅群落;放线菌为:羊草群落>杂类草群落>碱茅群落。土壤微生物随土层垂直递减分布,在土层0～15cm土壤微生物分布最多。3类微生物中,细菌数量最大,放线菌次之,真菌最小。相关性分析表明,只在刈割方式下羊草群落(sp1)和碱茅群落(sp2)土壤的微生物数量与地上生物量显著相关(P<0.05),其余相关性均不显著。
Leymus chinensis from steppes of northeast China was selected to investigate contents of soil microbial Population（fungi,bacteria and actinomycetes） under different use patterns.Results are as follows： soil microbial population in fenced grassland is higher than outside fenced.The number of soil microbial population is ordered as fenced mowing grassland grazing grassland.In three communities（sp1,sp2 and sp3）,the number of soil microbial population is ordered as sp1sp3sp2.In mowing grassland or grazing grassland,the number and distribution of soil microorganisms（fungi,bacteria and actinomycetes） are different among three plant communities.The number of fungi is order as sp1sp3sp2;the number of bacteria is ordered as sp3sp1sp2;the number of actinomycete is ordered as sp1sp3sp2.The number of soil microorganisms greatly varies with soil depth so that the number is much higher within 0~15 cm than that within 15~30 cm（2~4 times）.Among microorganisms,the number of bacteria is the highest and the number of fungi is the lowest.There is a closely correlation between sp1,sp2 aboveground biomass,and the number of fungi in mowing grassland,but this phenomenon is not observed in grazing grassland.
出处
《草地学报》
CAS
CSCD
北大核心
2012年第5期842-847,共6页
Acta Agrestia Sinica
基金
农业科技成果转化资金项目(2011GB2B200005)
黑龙江省农业科技创新工程种子创新基金项目(2010-10)
国家国际科技合作项目(2011DFR30840-11)资助
关键词
羊草草地
刈割和放牧
微生物数量
生物量
Leymus chinensis steppes
Monwing and grazing
Soil microorganisms
Population dynamics
