Eutrophication drives regime shift via changes in stoichiometric homeostasis-based submerged macrophyte assemblages

文献类型： 外文期刊

第一作者： Zhang, Chengxiang

作者： Zhang, Chengxiang;Lu, Cai;Liu, Peizhong;Lei, Guangchun;Pei, Hongcui;Liu, Cunqi

作者机构：

期刊名称：NPJ CLEAN WATER （ 影响因子：12.19； 五年影响因子：12.779 ）

ISSN： 2059-7037

年卷期： 2022 年 5 卷 1 期

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收录情况： SCI

摘要： Homeostasis for phosphorus (HP) in submerged macrophytes may influence the susceptibility of lakes to regime shifts; however, the mechanisms linking submerged macrophyte HP to regime shifts remain unclear. We conducted an in situ mesocosm experiment to compare the dynamic responses of a high-HP species, Potamogeton maackianus, and a low-HP species, Hydrilla verticillata, to different phosphorus (P) level gradients, as well as their effects on phytoplankton inhibition. The biomass of P. maackianus under mesotrophic P (MP; P concentration 0.05 mg L-1) and eutrophic P (EP; P concentration 0.10 mg L-1) conditions was either non-significantly different from, or lower than that under oligotrophic P conditions (OP; P concentration under detection limit of 0.01 mg L-1). Conversely, H. verticillata biomass under EP was significantly higher than that under MP on day 90, whereas it died under OP. This variable response of submerged macrophyte species to P level gradients increased the relative growth advantage of H. verticillata compared to P. maackianus during eutrophication. The inhibition ratio of phytoplankton (IRP) for P. maackianus was similar to 15 times higher than that for H. verticillata under EP. Our study demonstrated a trend that submerged macrophyte assemblage IRP increased along with its assemblage HP. Thus, the changes in submerged macrophyte assemblages from high-HP species-dominance to low-HP species-dominance would erode its phytoplankton inhibition capacity, and further promote the regime shift from a clear-water state to a turbid state. Our results advance the regime shift theory from an ecological stoichiometry perspective and highlight the importance of high-HP submerged macrophyte species in the restoration of eutrophic lakes.

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