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The effects of water depth on the growth and reproduction of Potamogeton crispus in an in situ experiment

Journal of Plant Ecology 2017年第3期10卷 546-558页

作者： Nannan Zhou Weiping Hu Jiancai Deng Jinge Zhu Weiwei Xu Xin Liu State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of Sciences73 East Beijing RoadNanjing 210008JiangsuChina College of Environmental Science and Engineering Anhui Normal University189 South Jiuhua RoadWuhu 241000AnhuiChina University of the Chinese Academy of Sciences 19 Yuquan RoadBeijing 100049China

Aims Water level is one of the most important determinants of the distri-bution and composition of submersed aquatic vegetation in shal-low *** changes in nutrient loading,large-scale declines in submerged macrophytes in shallow lakes are largely attributed to strong external or internal forces,including changes in water *** a winter-active submerged macrophyte,Potamogeton crispus has important functions in aquatic *** objec-tives of our study were to reveal the effects of water depths on the germination,growth,reproduction and morphological changes of *** under natural environmental conditions;identify the optimum water depth range for colonization of ***;and pre-dict the succession course for *** in Lake *** A long-term in situ experiment was performed to study the effects of water depth on the growth and morphology of *** across the entire life *** were grown in the improved cross type of rhizotrons for 30 weeks at three different water depths(60,120 and 200 cm)in Dongtaihu Bay of Lake *** measured the plant height,root length,the length and width of leaves and counted the numbers of leaves,ramets,turion spikes and roots of each plant on each observation day during the *** Findings Water depths ranging from 60 to 120 cm were favourable for above-ground vegetation growth,root tissue growth and the reproductive ability of *** water depth of 200 cm or beyond,the distri-bution of *** will be limited in the following year because of the lack of turion formation and the severe inhibition of ramet *** relationship between above-ground biomass and growth time at three different water depths fits a logistic growth curve well(P<0.001).The rapid growth and distribution with high density of *** at water depth near 60 cm during the reproductive stage is not favourable for growth of other submerged *** a continuous water depth of~60-120 cm is the op

关键词： influence strength morphology responses rhizotron shallow lakes submerged plant

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