羊草根际微生物数量动态及其与地上生物量关系的研究

用平板菌落计数法对松嫩平原羊草不同生育时期根际微生物数量的研究发现,随着羊草的生长发育,根际微生物数量呈现单峰曲线的变化趋势,表现为羊草生长发育初期根际微生物数量较少,随着生长条件的改善,微生物生长繁殖逐渐加快,数量逐渐增大,果后营养期达最大值,然后又下降.对羊草根际微生物数量与地上生物量的线性回归分析表明,在羊草整个生育时期,根际细菌、放线菌和真菌数量与羊草地上生物量都呈极显著正相关关系(P<0.01).

On the Rhizospheric Microorganisms' Quantity Tendency of L. chinensis and the Correlation with Aboveground Biomass

The rhizospheric microorganisms' quantity of L.chinensis was studied by plate counts for colonies at different development stages on Songnen Plains.The results showed that the quantity of the rhizospheric microorganisms presents the change tendency of the single peak curve along with the growth of L.chinensis.The rhizospheric microorganisms in the initial period of L.chinensis propagate rapidly,along with the improvement of the growth condition,the quantity increased gradually and reached the maximal value after the post-fruiting vegetation stage,then dropped.According to linear regression analysis about the relationships between rhizospheric microorganisms and the aboveground biomass,in the whole growth stage of L.chinensis,rhizospheric bacteria,actinomycete and fungi quantity with the aboveground biomass of L.chinensis assumes the extremely remarkable correlation(P<0.01).