Study On Soil Oribatid Mites Community Structure And Fluctuation Under Different Tillage System In Pudong District Of Shanghai

In order to investigate the effects of different tillage system on soil Oribatid mites Community structure in Pudong District, we had gathered soil Oribatid mites from five sample areas by Tullgren dried funnel method. 1572 soil Oribatid mites were gathered , and they belonged to 48 families.Index of number individuals,species number,community diversity,abundance,evenness,dominance and MGP are used to study the Community structure of soil Oribatid mites.The number and composition of soil Oribatid mites under different tillage systerm were different. The order of species numbers is:abandon of Wangqiao (27)>peach orchard of Tangzhen(24)>kaleyard of Tangzhen (22)=paddy field of Tangzhen (22) > paddy field of Gonglu (17) and the order of individual numbers:abandon of Wangqiao (403)>paddy field of Gonglu (393)>kaleyard of Tangzhen (305)>peach orchard of Tangzhen (250)>paddy field of Tangzhen (221). The advantageous and characteristic species from sample areas were varied. Scheloribates was dvantageous species in all sample areas, and took up more than 30% of all catches. At the same time, Zygoribatula,Ceratozetes and Punctoribates were also found in all sample areas and accounted for over 5% of all catches. All these showed that the above species wide-spread, environment -accommodating and played an obvious, controlling role on community structure and community environment. They could be used as Bioindicator to monitor and forecast the soil environment changes under different tillage system in Pudong District. Meanwhile characteristic species are rare and could be found only in specific ecologic environment. They are also peculiar to specific tillage and administrative system and reflected the different ecologic environments.The catches of soil Oribatid mites reached the high level in September and October, the low level in February, May and August. The study showed that the temperature and humidity were key enviromental factors affecting the number of soil Oribatid mites. The reproduction and growth of soil Oribatid mites depended on appropriate temperature and humidity. It was also found that farming exerted...