Effect of High-intensity Growing Conditions Year after Year on Soil Properties in Ningxia

LIU Yong-liang;GAO Yan-ming;LI Jian-she;ZHANG Xue-yan;Agriculture College Ningxia University;

high strength planting;;soil chemistry trait;;soil index;;microbial trait;;enzymatic activity

Compared the planting pattern of high strength continuous cropping in facilities with open and semi open planting in field and cold frame,researched composition change of soil nutrients, heavy metals, trace elements and microbial flora under the continuous cropping pattern of facilities,confirmed the influence of continuous cropping pattern on soil bacterial and fungal community diversity as well as the dominant bacteria in soil. The results showed that, even at high intensity for planting soil conditions, great changes occurred in the various ion content, including greenhouse sodium ions and chloride ion content compared with the field and cold frame to be reduced, the content of potassium ions, calcium ions and carbonate hydrogen ion increased that compared to the field and cold frame and higher. Microbial number in soil after high-intensity continuous cropping in greenhouse was significantly higher than the number of field and cold frame soil microorganisms. The high strength of the greenhouse decreased the activity of protease, urease and invertase, and increased the activity of dehydrogenase in soil. The high intensity of the planting of greenhouse caused a lot of soil nutrient accumulation, especially the accumulation of phosphorus was more serious. The contents of heavy metals in soil, especially the contents of Cr and Hg,were significantly affected. Meanwhile, the effective copper and zinc content in greenhouse soil was over ten times more than the content in cold frame and field. Therefore, it was effective to reduce the continuous cropping and rotation, and to make the facility soil long-term and effective.