Effect Of Intercropping Mode On Soil Ecologcial Environment Of Soil And Tomato Growth In Continuous Cropping Soil

With the development of vegetable industry, continuous cropping obstacles is becoming seriously, which has been regarded as an important limiting factor in sustainable and healthy developing of Chinese vegetable industry. Tomato is one of the main cultivated vegetables in greenhouse, and also one of the most serious continuous cropping obstacles vegetables. Soil enzyme activities, soil microorganisms numbers and community structures and tomato growth and development as affected by different cropping systems were evaluated in this experiment under continuous cropping soil conditions. Intercropping systems, in which lettuce or celery were planted on the side of tomato in the full growing season, were compared to tomato monoculture in normal or continuous cropping soil. Through comparing the different cropping systems’effects of relieving the tomato continuous cropping obstacle, this study try to provide a reasonable tomato cultivation mode and system in high quality and efficient, and put forward an ecological restoration method of relieve or overcome continuous cropping obstacle. And at the same time, the study attempt to provide theoretical basis for the sustainable production of greenhouse vegetables industry.The main results are as follows:1.Compare with control treatment, activities of invertase, urease, phosphatase and catalase significantly decreased in rhizosphere soil of continuous cropping obstacle treatment. The fungi group number of it is higher and the group number of bacterium and actinomycetes are lower. The continuous cropping obstacle reduced the growth rate of tomato plant height, stem diameter and the tomato yield and had a poor quality fruits.2.Intercropping lettuce or celery system improved the growth and development of tomato plant, and increased the yield and quality of the fruits, compare to tomato monoculture in continuous cropping soil. Lettuce-tomato intercropping system had better effects than celery-tomato system.3.The soil enzymes’activities of invertase, urease, phosphatase and catalase increased significantly under lettuce-tomato or celery-tomato intercropping systems. 4.Both lettuce-tomato and celery-tomato intercropping systems improved the soil microorganisms community structures. The group number of bacterium and actinomycetes increased dramatically, and the number of fungi group decreased. The soil microorganisms structure transformed from "fungoid" to "bacterial"5.Intercropping systems improved the number of microorganisms and activities of enzymes in rhizosphere soil,which including the increase of microorganisms number, bacterium number and the rate of bacterium/fungi in rhizosphere soil, the decrease of fungi number and the higher invertase, urease, phosphatase and catalase activities, and yield than the tomato monoculture in continuous cropping soil. The lettuce-tomato intercropping system had a better effect than celery-tomato system.