

FOLLOWUS
1.School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China
2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
3.School of Environment, Nanjing Normal University, Nanjing 210023, China
yjlu@nhri.cn
wangguoxiang@njnu.edu.cn
Received:27 February 2022,
Accepted:06 April 2022,
Online First:10 June 2022,
Published:01 September 2023
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WANG Yiping,XU Xiaoguang,LI Dujun,et al.Effect of light and nutrients on interspecific interactions between submerged macrophytes: implications for restoration of multispecies aquatic vegetation in eutrophic lakes[J].Journal of Oceanology and Limnology,2023,41(05):1821-1833.
Constructing multispecies submerged vegetation systems and maintaining stable seasonal succession is crucial for restoring shallow eutrophic lakes. However
little is known about the interactions between successional and existing species of different growth forms
particularly under the low light and high nutrient conditions of eutrophic lakes. We measured the functional traits of mature
Vallisneria
natans
(Lour.) Hara plants and
Potamogeton
crispu
s L. shoots in monoculture and mosaic patterns under different light and nutrient conditions. The effect of light on functional traits of the submerged macrophyte species was more significant than that of nutrients
but the reverse was true for
P
.
crispus
biomass allocation. Moreover
interspecific interactions affected only the submerged macrophytes under the low light condition and varied with species. Specifically
the interaction of
P
.
crispus
to
V
.
natans
was biased towards competition
while the interaction of
V
.
natans
to
P
.
crispus
was converted from facilitation to competition by eutrophication
particularly in the homogenous mosaic growth pattern. This study demonstrates that sufficient light is a prerequisite and patch planting is an effective means to form a multispecies submerged vegetation system. In addition
we emphasize that the coexistence of eutrophication and low light will likely result in a competition between submerged macrophytes thus simplifying the vegetation
even if their growth forms and growing seasons are different. These findings help explain the collapse of multispecies submerged vegetation and guide the restoration of aquatic plants in eutrophic lakes.
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