期刊
KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS
卷 -, 期 412, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/kmae/2013088
关键词
Lake Poyang; tributaries; chlorophyll a; light; water retention time
资金
- National Basic Research Program of China [2012CB417005]
- National Natural Science Foundation of China [41301088]
- Science and Technology Major Project of Jiangxi Province [20114ABG01100]
Variations in phytoplankton chlorophyll a were studied in Lake Poyang, and these variations were compared with those observed in its tributaries. Samples were collected from January 2009 to January 2013 during the dry, mid-dry and wet seasons. The study showed that chlorophyll a concentrations were significantly higher in the wet season than in the dry and mid-dry seasons (p < 0.0001) in the lake; a comparative analysis of Lake Poyang and its tributaries showed significant differences in chlorophyll a between the two ecosystems during the wet season but not during the dry and mid-dry seasons. During the wet season, the underwater light conditions were significantly elevated and water retention time increased substantially (25.5 d). In combination, these factors contributed to a significantly higher chlorophyll a concentration during the wet season than that during the dry and mid-dry seasons in the lake; the effect of nutrients on the phytoplankton was not obvious. The large variations in water retention time during the three seasons indicated that Lake Poyang has the combined characteristics of a river and a lake. The short retention times during the dry and mid-dry seasons produced no difference in chlorophyll a between the lake and its tributaries, whereas the long retention time during the wet season facilitated phytoplankton growth in the lake.
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