羊草草原土壤微生物的分布及其与土壤因子间的关系

 本文较系统地研究了东北羊草草原土壤微生物的分布规律和环境因子对微生物分布的制约作用。结果表明：微生物的数量、生理群的数量及微生物总生物量在羊草和杂草群落土壤生境中均最高，而碱茅和碱蓬群落生境中最低，隐子草群落生境居中。土壤全磷、全氮、全钾、pH和活性有机质对微生物有较大的直接作用，通径系数为6.15—2.02。全氮—全磷、活性有机质-全磷、pH-全磷、pH-全钾、全钾—全磷、活性有机质—全氮、活性有机质—全钾和有机质—全氮之间的间接作用对微生物影响最明显，作用系数为5.94—2.90，其余因素的作用相对不显著。

DISTRIBUTION OF SOIL MICROORGANISM IN THE SOIL OF LEYMUS CHINENSIS GRASSLANDS IN NORTHEASTERN CHINA PLAIN AND THEIR RELATIONS WITH SOIL FACTORS

The distribution laws of soil microorganism in the soil of L. chinensis grasslands were investigated in Northeastern China Plain,and the effects of soil features on them were analyzed.The results showed that the amount and the net biomass of microorganism was the biggest in the soils under L. chi- nensis community and weed community,the smallest in the soil covered by the Puccinejjia tenuifora community,and moderate in the soil of Cleistogenes squarrosa community.Among the measured 11 soil factors,the interactions between pairs of soil total N-total P,active organic matter-total P,pH- total P,pH-total K,total K-total P,active organic matter-total N,active rganic matter-total K,organic matter-total N were distinct,with the co- rrelation coefficients of 2.90-5.94.The direct effects of total P,N,K,pH and active organic matter on the microbial biomass were significant,with the path coefficient of 2.02-6.15.