Carbon, nitrogen and phosphorus stoichiometry of two submerged macrophytes are more affected by plant species and organs than by light
Jin-Rui Yuan
A B , Feng Li B , Dong-sheng Zou A , Shi-yun Ye A , Yong-Hong Xie B * and Ai-Ping Wu A *
+ Author Affiliations
- Author Affiliations
A Ecology Department, College of Resources and Environment, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha, 410128, PR China.
B CAS, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Changsha, 410128, PR China.
Marine and Freshwater Research 73(11) 1323-1330 https://doi.org/10.1071/MF21279
Submitted: 30 September 2021 Accepted: 17 June 2022 Published: 28 July 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Submerged macrophytes develop great phenotypic plasticity responding to light stress. However, the light effects on carbon (C), nitrogen (N) and phosphorus (P) stoichiometry of submerged macrophytes are unknown.
Aims: To determine the stoichiometric response of Myriophyllum spicatum and Vallisneria natans to a light gradient.
Methods: We determined the C, N and P stoichiometry of two aquatic plants grown in pots subjected to an incident light gradient ranging from 100 to 17% of incident light.
Key results: The C, N and P stoichiometry of V. natans (except C:N of root) were not significantly different among the light treatments, whereas those of M. spicatum (except leaf element concentrations and root element ratios) showed significant differences across the light gradient. The analysis of variance results implied that the species, plant organs and their interactions explained more than 75% of total variance of all measured indices (except C).
Conclusions: The C, N and P stoichiometry of the two studied submerged macrophytes are more affected by plant organs and species than by light irradiance.
Implication: Although C, N and P stoichiometry of submerged macrophytes was little affected by light irradiance, whether the stoichiometry of submerged macrophytes is stable under other environmental factors should be focused on in future investigation.
Keywords: light gradient, Myriophyllum spicatum, organ, relative growth rate, species, stoichiometry, submerged macrophyte, Vallisneria natans.
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