Effect of water鄄level fluctuation discrepancy on the composition of different annuals in Three Gorges Reservoir drawdown zone
Effect of water鄄level fluctuation discrepancy on the composition of different annuals in Three Gorges Reservoir drawdown zone
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Yuan Shen-hong;Zeng Bo;Sui Xiaolei;Xu Jianping
中科院分区：
文献类型：
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作者：
Yuan Shen-hong;Zeng Bo;Sui Xiaolei;Xu Jianping
After the Three Gorges Dam impoundment, the original water鄄level fluctuation rhythm of Yangtze River change dramatically. As a result, two new kinds of drawdown zones appear in Three Gorges Reservoir ( TGR): the preupland drawdown zone (PU鄄DZ) which never submerged before impoundment and the preriparian drawdown zone (PR鄄DZ) which is the former riparian zone of Yangtze River. The water鄄level fluctuation rhythm of PU鄄DZ is high in winter because of impoundment, and low in the summer because of flood discharged. Meanwhile, the PR鄄DZ is affected by both the impoundment in winter and the flood in summer, so the water鄄level can raise high in winter and summer. Apparently,they both have differences with the water鄄level fluctuation rhythm of natural riparian zone (NRZ), which is only high in summer for the flood. Annuals can be divided into three types according to their germination and fructified characteristics: annuals germinating in winter fruitifying in summer(AGWFS), annuals germinating in spring fruitifying in autunm (AGSFA) and