Structure and function of soil animal community diversity in the Nanji Wetland of Poyang Lake

• 1、Department of Biology, East China University of Technology, Nanchang 330013

Abstract：The Nanji wetland is located in the south of the main lake area of Poyang Lake in Jiangxi. It is the frontier of the Ganjiang River into the Poyang Lake and a national nature reserve. This survey of the diversity of soil animals in the Nanji wetland aims to provide a basis for the protection and utilization of the Nanji wetland and even Poyang Lake. This survey selected six typical sample plots, in which each plot was divided into three sample sits, such as the Nanshan vegetable field (A), the Nanshan beach (B), the Nanshan shrub (C), the Jinshan forest (D), the Jishan shrub (E) and the Jishan beach (F), for each site to collect surface soil (including surface debris, surface depth above 5cm) and deep soil (5cm deep, about 10cm thick); picked up and separated by using arm and self-developed instruments apart, and collected soil animals, and then classified identification, mathematical statistics and diversity study. This survey obtained 80 species of surface soil animals and 71 genera in 26 orders, with the highest species richness of Coleoptera in Arthropoda. The surface community diversity analysis indicated that the richness of the Jishan beach (F), the dominance of the Jishan shrub (E), the diversity of the Nanshan vegetable field (A) and the eveness of the Nanshan vegetable field (A) were the highest respectively. The SHE analysis showed that the surface soil animals are uniform and continuous, and the clustering analysis showed that the surface layer community similarity was E=F-B-D-A-C. In short, the diversity of surface soil animals of the Nanji wetland has a strong surface aggregation characteristic, and its community structure and function is prominent in the horizontal connection and vertical linkage, and the gradient change of the regional landscape matrix background has obvious traces. In addition, this survey obtained 30 species of deep soil animals in 5 phyla, 16 orders, 28 genera, with the highest species richness of Collembola in Arthropoda. The deep communities diversity analysis showed that the richness of the Nanshan beach (B), the dominance of the Jishan beach (F), the diversity of the Jishan beach (F) and the eveness of the Nanshan vegetable field (A) were the highest respectively. The SHE analysis shows that the deep soil animals are uniform and continuous, and the cluster analysis shows that the deep layer community similarity is C=D-E-F-B-A. In short, the soil animal communities diversity of the deep layer in the Nanji wetland is lower than that of the surface layer, but it can better reflect the complexity and stability of the Nanji wetland ecosystem. Generally speaking, the above-ground plants in the Nanji wetland can map the growth status of their underground roots and improve the implanted soil status, drive the radiation succession of the adjacent soil biological communities centered on the root tip, and shape the new soil structure and function pattern of the dynamic change of soil matrix, root corridor and biological patch.

Keywords： Poyang Lake the Nanji wetland soil animal community diversity structure function