Effects of plant size on the growth of the submersed macrophyte Vallisneria spinulosa S.Z.Yan at different light intensi
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PRIMARY RESEARCH PAPER
Effects of plant size on the growth of the submersed macrophyte Vallisneria spinulosa S.Z.Yan at different light intensities: implications for lake restoration Guixiang Yuan . Hui Fu . Meihong Zhang . Qian Lou . Taotao Dai . Erik Jeppesen
Received: 11 March 2020 / Revised: 23 July 2020 / Accepted: 1 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract The growth and reproduction of plants are highly size-dependent and markedly affected by light intensity. Vallisneria spinulosa S.Z.Yan is a common submersed macrophyte and is widely used in current lake restoration projects. The size of plants to be used to get optimal restoration results is not known, however, and may vary with water clarity. In this study, the effects of different plant sizes (large, medium and small, i.e. approximately 2.40 g, 1.01 g and 0.27 g per plant) on the growth and reproduction of V. spinulosa were tested under three light intensities (high, medium, low, i.e. 25%, 6% and 1% of full sunlight, respectively). Both plant size and light intensity were found to be of great significance for plant growth and reproduction. The relative growth
rate (RGR) of biomass was higher for small than for large plants at both high and low light, while the absolute growth rate (AGR) of biomass was higher for large-sized plants at medium and high light intensity. Asexual reproduction of V. spinulosa was positively correlated with plant size and more affected by plant size than by light intensity, while sexual reproduction was most affected by light intensity. RGR and AGR of plant height were highest for medium-sized plants at moderate light intensity. Therefore, the size of submersed macrophytes should be considered when using this species in connection with lake restoration. Verification of our results under field conditions is needed, though, before firm conclusions can be reached about the optimal plant size of V. spinulosa to be used in lake restoration as also other factors like,
Handling editor: Chris Joyce G. Yuan (&) H. Fu Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Ecology Department, College of Resources and Environment, Hunan Agricultural University, Changsha, China e-mail: [email protected] G. Yuan H. Fu M. Zhang Q. Lou T. Dai Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake, Jiangxi Institute of Water Sciences, Nanchang, China
E. Jeppesen Sino-Danish Centre for Education and Research, Beijing 100049, China E. Jeppesen Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey
E. Jeppesen Lake Section, Department of Bioscience, Aarhus University, Silkeborg, Denmark
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Hydrobiologia
e.g. periphyton shading and wave actions may play a role. Keywords Plant size Vallisneria spinulosa Light intensity Relative growth rate Reproduction
Introduction The growth and propagation of submers
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