Dry farmland soil microbial diversity on the response of the conservation tillage and its relationship with crop growth

Dryland cropping accounts for about 56.84% of total area of Chinese cultivated land, affected by climate, terrain and water resources special restriction, conventional tillage leading to the soil nutrient loss, serious degradation and the decline of soil productivity, and having a considerable impact on the regional agricultural sustainable development. Conservation tillage can improve soil structure, and conserve soil fertility and mositure effectively, so it is of great significance to study the functional mechanism of the conservation tillage in dryland cropping ecosystem . The project based on the dryland agriculture production and the current situation of agro-ecosystem, using the molecular biotechnique system to study the response of the soil microbial community abundance, structure and ecological functional diversity to the conservation tillage, combinated with the knowledge of ecology and crop planting and cultivation, deeply analyze the time-space change law and the relationship with crop growth of soil microbial diversity under the conservation tillage. By conducting the experiment,we can identify a clear soil microbial mechnism of the high yield of dryland wheat to provide the theoretic support for the efficient, ecological and sustainable conservation tillage technical system.