Research Of Soil Microbes And Enzymatic Ctivitiies Under Continous Cropping In The Greenhouse At Loess Plaeau

In recent years, the sunlight glass house structure area at the loess plateau area is unceasingly expanded. The cucumber is one of main vegetable crops which in the sunlight greenhouse plants and takes up the 60% of the greenhouse vegetables area. Looking from the development tendency, regardless of in the quantity and the quality, our country cucumber's expense demand all increases steadily, the cucumber is more and more pay much attention to the environmental pollution and the nutriment archery target. But along with the social economy development, the vegetables consumption quantity is daily increased, the great scale of the greenhouse vegetables production is higher and higher day after day and a special reason is benefit actuation. It emerges one batch of vegetables types relatively sole specialized production base one after another, which causes the original cropping system to disintegrate objectively, the farmer who is engaged to run some specific vegetables production is increased day by day, the vegetables type are restricted frequently by the high production and economic efficiency fruit vegetables, the tendency of specialized production is suddenly revealed day after day, finally is causes the soil environment to worsen, the vegetables plant disease to be serious, the output to reduce, the quality and the series barrier of continuous copings to occur and the facility vegetables production further development to be cut down. Therefore, the cucumber continuous cropping barrier has become a big difficult problem at present which is key problem to the sunlight greenhouse production waited to be solved urgently, and brings to the domestic and foreign scholars' attention.This experiment chooses the qingcheng county, Xuanma, Gaolou of Qingyang city and just outside the city about 8 spots have representatively, the distinction continuous cropping 3 years, 4 year, 5 year, 6 year, 11 year, 12 year sunlight greenhouses cucumber soil is the research object, we take each greenhouse with the non- continuous cropping dew soil (vegetable field, grain field) to be the comparison, and also we have studied the enzyme activity an, main class group and soil main nutrient condition of the grem. And we have promulgated the harm which is the main mechanism of the cucumber continuous cropping barrier and proposed the solution measure and the means. In order to solve the problem ofgreenhouse cucumber continuous cropping barrier, we have established the science the cucumber cultivation system and provided the theory basis of the cucumber high yield and high quality and continual production. The result showed that: the main nutrient content of the soil have the tendency of increasing by the number of years of continuous cropping but edaphonvs quantity and enzyme activity are reduced. The mount of germ and fungus quantity in soil are remarkably increased for the continuous cropping about 5 years, puts the trichobacteria quantity always change tendency to reduce;The edaphon total quantity, the bacterium quantity change reduces generally above the continuous cropping 5 years and below 5 years (including 5 years) the change are not obvious;In the nitrogen physiology group by ammoniates the bacterium primarily and the quantity changes are not very big;The nitrifying bacteria quantity is lower than the comparison (non- continuous cropping), the quantity of denitrifying bacteria is opposite;The alkalinity phosphatase, the urease, invertin activeness have a closed relations with the continuous cropping when it will increase less than 5 years or decrease in more than 5 years. The relation between catalase activeness and the continuous cropping is not very big. The reduction of the invertin activeness, the alkalinity phosphatase, urease activeness have slightly elevates, catalase activeness have no the regular changes.