关键词: 饱和导水率, 土壤侵蚀, 导气率, 相对气体扩散率, 土地利用方式

Abstract: The seasonal dynamics of community structure of crustacean zooplankton in the collapse lakes of Huaibei mining areas (Lake Donghu and Lake Liuqiao) were investigated in April, July, and October 2017 and January 2018. The results showed that a total of 12 species were recorded in two lakes, out of which 8 species (7 genera) belong to cladocera and 4 species (4 genera) belong to copepoda. The annual average density and biomass of crustacean zooplankton in Lake Donghu (12.8 ind·L^-1 and 0.26 mg·L^-1) were higher than those in Lake Liuqiao (4.4 ind·L^-1 and 0.1 mg·L^-1). In Lake Donghu, Mesocyclops leuckarti and Diaphanosoma brachyurumwere the dominant species in summer and autumn, whereasCyclops vicinus, Alona quadranyularis, Daphnia galeata, and Chydorus ovalis were the dominant species in winter and spring. In Lake Liuqiao, Bosmina sp., D. brachyurum and M. leuckarti were the dominant species in summer and autumn, whereasA. quadranyularis and C. vicinus were the dominant species in winter and spring. The average values of Shannon index in Lake Donghu and Lake Liuqiao were 0.64±0.27 and 0.93±0.29, respectively. Results from the redundancy analysis showed that water temperature, nutrient concentration (TN and TP), and phytoplankton biomass were main environmental factors affecting the community structure of crustacean zooplankton. The predation pressure of Hypophthalmichthys molitrix and Aristichthys nobilishad an important influence on the seasonal dynamics of crustacean zooplankton community in both lakes.

Key words: land use pattern, soil erosion, air permeability, saturated hydraulic conductivity, relative gas diffusion