浑善达克沙地榆树生长状况与根际土壤微生物的关系研究

Relationships between the growth condition of the elm and the rhizosphere microorganism in Hunshandak sand

从浑善达克沙地三个不同地点、三种不同立地类型区采集榆树根际土壤样品,在实验室对土壤中微生物进行培养、分离,力求探索榆树疏林的生长状况与土壤微生物之间的关系。结果是:总体上讲三大类微生物细菌、放线菌、真菌数量上差异显著,平均值分别为细菌46.84(10~6·g^(-1))、放线菌34.69(10~6·g^(-1))、真菌5.49(10~6·g^(-1))。在榆树的生长状况较好的丘间地和阴坡上,三大类微生物细菌、放线菌、真菌数量比榆树生长较差的沙丘阳坡上明显多;细菌在丘间地上、阴坡、阳坡上的数量分别为59.46(10~6·g^(-1))、42.82(10~6·g^(-1))、38.25(10~6·g^(-1))。榆树各项生长指标均较高的沙地中部正蓝旗,土壤三大类微生物数量明显多于西部的正镶白旗和东部的克什克腾旗,细菌数量在正蓝旗、正镶白旗、克什克腾旗分别为59.87(10~6·g^(-1))、49.10(10~6·g^(-1))、41.54(10~6·g^(-1))。由此可见,榆树的生长状况与微生物的数量呈正比关系。

We collected elm rhizosphere soil samples on different sites from HunShanDaKe sand, and cultivated and separated soil microorganism in the laboratory to explore relationship between growth status of elm woodlands and soil microorganisms. The results were ： in general, there were significant differences in the number of bacteria, actinomycetes and fungi, with an average of bacteria 46.84（ 10^6 · g^-1 ） , actinomycetes 34.69（ 10^6 · g^-1） and fungi 5.49 （10^6 · g^-1）. The number of bacteria, actinomycetes and fungi on lowland of dune and shady slope where elm grew better were significantly more than them on sunny slope where elm grew worse. The number of bacteria on lowland of dune, shady slope and sunny slope were 59.46 （ 10^6 · g^-1 ） , 42.82 （ 10^6 · g^-1） and 38.25 （10^6 · g^-1）, respectively. In middle of the sandland, all growth indexes of elm were higher and number of soil microorganism were significantly more than that in western and eastern sand land. The growth of elm was positively correlated with the number of microorganisms.