Effect of water treatments on soil microbial activity and soil enzyme in the non-tillage field

• 1、Co1lege of Agronomy and BiotechnoIogy, China Agricultural university, Beijing 100193

Abstract：In order to provided the basis for a reasonable water-saving irrigation system, the effects of different water treatments on soil microbial activity, soil microbial biomass nitrogen and soil enzyme were determined in the non-tillage winter wheat field in North China Plain. The results showed that the activities of soil β-glucosidase,polyphenol oxidase and urease decreased by water deficit, however, the soil enzyme activity of 0-10 cm layer was much higher than that of the 10-20 cm layer with water stress. The soil basal respiration and microbial biomass nitrogen was affected by water stress in the jointing and filling stage, e.g. the soil basal respiration was much lower with W2 and W3 than that with W1, the microbial biomass nitrogen was significantly regulated by water stress, the trend was: W1＞W2＞W3, reaching significant level.Water treatments could affect the winter wheat yield. Yield of winter wheat were decreased by 3.17% and 22.1% with W2 and W3 compared with W1.

Keywords： Crop cultivation and Farming System water stress non-tillage soil enzyme soil basal respiration soil microbial biomass nitrogen