Growth Of Winter Wheat And Soil Microbial Community Dynamics Under The Different Straw Condition

Straw is widely used to agricultural production due to containing a lot of the nutrients of the soil ecosystem neededv.straw provide the necessary nutrients, while micro-rhizosphere soil affect soil animals. The pot field experiment method to study under the different straw condition,crop growth and development of straw and winter wheat rhizosphere microbial community dynamics have influence on different straw condition.Mainly research from the following aspects.In different straw pot experiment, research wheat roots,microorganisms, nematodes, soil physical and chemical properties, simulation model of outdoor field, quantity of straw on the rhizosphere microbial community dynamics, microbial community dynamics have influence on development of the crop. Different quantity of straw is designed to 3000 kg/hm~2 (â… ), 6000 kg/hm~2 (â…¡), 9000 kg/hm~2 (â…¢), 12000 kg/hm~2 (â…£) four treatments, not straw as control (ck ), research winter wheat growth, yield and root characteristics of the root length, root diameter, surface and volume dynamic,microbial bacteria,fungi,actinomycetes community dynamics.nematodes in the different functional groups of fungi nematodes, bacterivorous nematodes, phytophagous nematodes, omnivorous predatory nematode community dynamics. The results showed that dry matter accumulation of winter wheat under different treatments were S-type growth trend, with the straw increase, dry matter accumulation increased, 9000 kg/hm~2 up to the maximum. root length of winter wheat under different treatments have the same growth trends, growth was rapid in early growth stage, flowering root length increased with straw increase, the slow root growth after flowering; Root diameter of each treatment were tested in the growth trend of the whole growth period,from Jointing stage to booting stage is fast-growing, late slow growth.root SurfArea, root volume were tested in the growth period is steady growth trend, the same growth trend in all treatments. the stalk on 9000 kg/hm~2 treatment conditions have the largest output.Dynamics of microbial community showed that the microbial biomass of straw treatment is larger than the control, performance is the s-type growth trend in the winter wheat elongation stage . from Jointing stage to flowering stage ,9000 kg/hm~2 treated have the highest density of microorganisms, ck at a low level; bacteria, fungi and actinomycetes, are also is maximum. Correlation analysis showed that the jointing - booting microbial density and the amount of straw used for the positive correlation.Nematode research results show that have 36 nematodes species are detected in four samples, nematode density in the whole growth period under different treatments were tested first increased and then decreased, booting up to the maximum, 9000 kg/hm2, 12000 kg/hm2 treatment significantly higher than other treatments. Jointing - booting omnivorous, predatory nematodes were the dominant groups, after booting the bacterivorous nematodes were the dominant groups. Booting - flowering, fungal nematodes, bacterivorous nematodes, phytophagous nematodes are highest under 9000 kg/hm2 treatment conditions. The correlation analysis showed that nematode density and straw quantity,root length are positively correlated.Physical and chemical properties of soil in different treatments also significantly different. The analysis shows that, in the jointing stage, 9000 kg/hm2 treatment conditions is the lowest content of organic matter. With the growth of winter wheat nitrogen content decreased. Therefore,add to straw is 9000 kg/hm2 treatment conditions, the corresponding micro-organisms, nematode community dynamics and soil nutrient content is most suitable for the growth of wheat.