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《Journal of Anhui Agricultural Sciences》 2012-18
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Influence of the Repeated Flooding on Growth and Development of Acorus calamus Vegetation in Water-level-fluctuation Zone of the Three Gorges Reservoir

LI Qiang(College of Chemical and Environmental Engineering,Chongqing University of Arts and Sciences,Chongqing 402160)  
[Objective] The research aimed to study influence of the repeated flooding on growth and development of A.calamus in water-level-fluctuation zone of the Three Gorges Reservoir.[Method]A.calamus plants were exposed to water under the dark conditions respectively in September 2009 and September 2010.Then,they were taken away from the water,and grew in natural conditions in the following March and April respectively(marked as S1,S2,S'1 and S'2).The plant number was conducted statistics respectively.On May 7,the leaf number was made statistics.Length,width and rapid light responding curves of the leaves were determined.[Result] Repeated flooding restrained significantly plant germination under the dark condition.Plant number in S'1 and S'2 groups decreased by 38.9% and 33.3% respectively compared with the control.It also reduced survival rate of the plant.Plant number in S'2 group decreased by 16.7%(P 0.05) compared with that of S2 group when they were taken away from the water.Both of flooding promoted elongation of the leaves,restrained leaves to grow wider,and also restrained leaf formation of the plants except for S1 and S'1 groups.Total leaf length of a plant decreased markedly after the second flooding which in S'1 and S'2 groups were 50.6% and 36.9% respectively less than that after the first flooding.Total leaf number of the plant in S'1and S'2 groups reduced significantly,and they were only 63.1% and 38.5% respectively of the control.Compared with the first flooding,total leaf length of a plant in the control increased significantly and decreased remarkably in S'2 group after the second flooding.Furthermore,light response ability of the relative electronic transfer rate(rETR) in S'1 group wasn't significantly different from the control,and rETRmax in S'2 group was significantly less than the control.Moreover,non-photochemical quenching(NPQ) decreased remarkably in S'1 and S'2 groups.It indicated that A.calamus had good restore ability of the light response,but restoring of its heat dissipation capacity was slower.[Conclusion] Repeated flooding inhibited plant growth and population recovery of A.calamus under the dark condition.
【Fund】: 重庆市科委自然科学基金计划项目(CSTC 2009BB7255);; 重庆文理学院引进人才启动资金项目;重庆文理学院科研项目(XZ031)
【CateGory Index】: S682.32
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