Eutrophication characteristics of a karst plateau deep-water Wanfeng Reservoir
LI Qiu-hua, SHANG Li-hai, GAO Ting-jing, ZHANG Lei, OU Teng, HUANG Guo-jia, CHEN Chuan
1. Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang 550001, China; 2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550001, China
Karst plateau deep-water Wanfeng Reservoir was taken as an example, and its limnology variable and eutrophication characteristics in summer and winter were analyzed. The results showed that characteristics of limnology and eutrophication obviously differed between winter and summer. Temperature(Tem), pH, dissolved oxygen(DO), conductivity at 10 m and 30 m had obvious demarcation points in summer, while only a demarcation point in 30 m appeared in winter, which showed the summer belonged to the double-layer- type and winter belonged to single- layer- type. The temperature change was small at water surface and the bottom, and was about 10℃ in the bottom which was in anaerobic condition. The concentrations of calcium ion (Ca2+) were from 0.192 to 0.235 mg/L; those of magnesium ion (Mg2+) were from 0.149 to 0.196 mg/L, but the vertical and seasonal changes were small. The concentrations of total phosphorus were from 0.02 to 0.04 mg/L in the surface, up to 0.794 mg/L in the bottom. The concentrations of total nitrogen were from 2.18 to 3.54 mg/L. Judging by the single factor index, Wanfeng Reservoir belonged to mesotropic status. Wanfeng Reservoir layered characteristics in different seasons, reflecting the karst plateau deep-water reservoir limnology variation characteristics. The water layer affected water environment factors and the degree of eutrophication.
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