ECOLOGICAL CHARACTERISTICS OF MACROZOOBENTHIC COMMUNITY OF TIDAL FLAT WETLAND IN THE CHANGJIANG ESTUARY
YUAN Xing-zhong\+1,LU Jian-jian\+2(1.College of Resource and Environmental Science, Chongqing University, Chongqing 400044, China;2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University,Shanghai 200062, China)
The species composition and community characteristics of macro zoobenthos in the tidal flat wetland of the Changjiang estuary were investigated. There are 68 species of benthic macro-invertebrates on the tidal flat wetland of the estuary. They can be divided into three categories, i.e, fresh water species, brackish water species and sea water species, which reflects the characteristics of estuarine ecological environmental transition zone. The number of macrofaunal species increases with the rise of salinity along estuarine environmental gradient of the Changjiang estuary. Along elevational gradient of the tidal flat wetland, species richness and diversity index of macrofauna increased with the rise of individual density and biomass of Scirpus mariqueter. Because there were differences in water dynamics and characteristics of sediment, zonation of macrofaunal community exists in creek sections in the Changjiang estuary. From the bottom of creek,and the bank of creek to grass tidal flat, variations in the composition of species reflects ecological series of macrofaunal community in creek system of estuarine tidal flat wetland.It is emphasized that different spatial scales in heterogeneity determined by estuarine salinity gradient, elevational gradient, salt marsh vegetation and creek system influenced the community structure of macrofauna in the tidal flat wetlands of the Changjiang estuary. Salt marsh vegetation, tidal creek and micro-topographical elements are representative characteristics of natural tidal flat wetland ecosystem in the estuary. When we consider from different spatial scale, estuarine gradients, elevational gradients, tidal creek system, it is evident that they are related to habitats heterogeneity. It is the different scale heterogeneity that contributes to the zoobenthic diversity and community structure in the tidal flat wetland of the estuary. When drawing the program of the wetland restoration we should pay close attention to salt marsh vegetation, elevation and topography (especially tidal creek system) in determining macrofaunal community.
【Fund】： 教育部重点项目 (K0 2 10 )资助
【CateGory Index】： Q958.1
【CateGory Index】： Q958.1