Studies On The Rhizospheric Microorganisms' Quantity Tendency Of L. Chinensis And The Correlation With Aboveground Biomass And Soil Environment

The activity of soil microbes has the vital role to the plant nutritive materials transformation and the soil fertility formation. The rhizospheric microorganisms and the root system compose a special ecosystem. It is an important index to appraise the quality of soil ecological environment that the population, the quantity and the distribution of the rhizospheric microorganisms. At present, there was few studying on the rhizospheric microorganisms and the rhizospheric effect in different developmental stages on L. chinensis. Studied on the rhizospheric microorganisms'quantity tendency of L. chinensis and the correlation with aboveground biomass and soil environment at different developmental stages, can not only elucidate increase and decrease rule of the rhizospheric microorganisms'population of L. chinensis, but also help to reveal the relation between the rhizospheric microorganisms and the growth of L. chinensis, thereby provides the theory gist for the research and the production of L. chinensis.We studied on the rhizospheric microorganisms'quantity of L. chinensis by plate counts for colonies at different developmental stages in 2006 on the Songnen Plains. The study showed that, along with the growth of L. chinensis, the quantity of the rhizospheric microorganisms presents the change tendency resembling the single peak curve. The performance was less for quantity of the rhizospheric microorganisms in the initial period of L. chinensis, along with the improvement of the growth condition, the growth reproduce of rhizospheric microorganism speeded up gradually, the quantity increased gradually and reached the maximal value after the post-fruiting vegetation stage, then dropped. The quantity of rhizospheric microorganisms at different developmental stages was: Post-fruiting vegetation stage > Dough stage > Milk stage > Flowering stage > Heading stage > Turning yellow stage > Turning green stage. The quantity of rhizospheric bacteria, actinomycete and fungi was: rhizospheric bacteria > rhizospheric actinomycete > rhizospheric fungi. Bacteria in flowering stage and fungi in post-fruiting vegetation stage behaved the rhizospheric adverse effect. Other microorganisms at every stage behaved rhizospheric effect. In the entire stage of L. chinensis, the bacteria rhizospheric effect size order was: Post-fruiting vegetation stage > Dough stage > Milk stage > Heading stage > Turning yellow stage > Turning green stage > Flowering stage; the actinomycete rhizospheric effect size order was: Turning yellow stage > Milk stage > Flowering stage > Post-fruiting vegetation stage > Dough stage > Heading stage > Turning green stage; The fungi rhizospheric effect size order was: Milk stage > Heading stage > Flowering stage > Dough stage > Turning yellow stage > Turning green stage > Post-fruiting vegetation stage. The undulation of bacteria rhizospheric effect (R/S: 0.84-9.27) was wider than these of actinomycete (R/S: 1.55-3.35) and fungi (R/S: 0.92-2.67). Compared the rhizospheric effect of bacteria, actinomycete and fungi, in the milk stage, dough stage and post-fruiting vegetation stage, their size order was: bacteria > actinomycete > fungi. At other stages, their size order was: actinomycete > fungi > bacteria.The results of linear regression analysis about the relationships between rhizospheric microorganisms and the aboveground biomass or the water hot factor showed that, in the entire stages of L. chinensis, rhizospheric bacteria, actinomycete and fungi quantity with the aboveground biomass of L. chinensis assumes the extremely remarkable correlation (P<0.01). The quantity of rhizospheric bacteria was extremely remarkable correlation (P<0.05) with the soil moisture and the temperature. The quantity of rhizospheric actinomycete and fungi was extremely remarkably correlation (P<0.01) with the soil moisture and the temperature assumes. The rhizospheric effect of bacteria with the aboveground biomass of L. chinensis assumes the extremely remarkable correlation (P<0.01), with the soil moisture and the temperature assumes remarkable correlation (P<0.05). The rhizospheric effect of actinomycete and fungi had no remarkable correlation (P>0.05) with the aboveground biomass of L. chinensis, the soil moisture and the temperature.The results of Studied on the rhizospheric microorganisms'quantity tendency of L. chinensis and the correlation with aboveground biomass and soil environment at different developmental stages showed that, it showed remarkable correlation between the rhizospheric microorganisms'quantitative tendency and the growth of L. chinensis, and between the soil moisture and the temperature. There were the mutual restriction relations between L. chinensis and the rhizospheric microorganisms, the rhizospheric microorganisms'activity could improve plant's nutritional conditions, the root exudates could promote the rhizospheric microorganisms'growth, it resulted in the extremely remarkable correlation between the rhizospheric microorganisms quantity and the aboveground biomass of L. chinensis , different rhizospheric effect at different developmental stages in different rhizospheric microorganisms of L. chinensis. The moisture and the temperature of soil were important environment factors for growth, development and reproduction of rhizospheric microorganisms. Only suitable moisture and temperature can make rhizospheric microorganisms grow naturally, it ensured that the energy flowage and the material circulation in L. chinensis plain ecosystem.