DOI: 10.1016/j.watres.2018.11.024
Scopus记录号: 2-s2.0-85056730731
论文题名: Stoichiometric mechanisms of regime shifts in freshwater ecosystem
作者: Su H. ; Wu Y. ; Xia W. ; Yang L. ; Chen J. ; Han W. ; Fang J. ; Xie P.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 302
结束页码: 310
语种: 英语
英文关键词: Ecological resilience
; Eutrophication
; Stoichiometric homeostasis
; Submerged macrophyte
Scopus关键词: Eutrophication
; Lakes
; Physiology
; Water
; Alternative stable state
; Ecological resilience
; Ecological stoichiometry
; Freshwater ecosystem
; Stoichiometric homeostasis
; Submerged macrophyte
; Submerged macrophytes
; Transition mechanism
; Ecosystems
; nitrogen
; phosphorus
; water
; community structure
; concentration (composition)
; ecosystem function
; ecosystem resilience
; ecosystem structure
; eutrophication
; freshwater ecosystem
; homeostasis
; stoichiometry
; submerged vegetation
; Article
; biomass production
; community structure
; eutrophication
; freshwater environment
; homeostasis
; lake
; macrophyte
; molecular stability
; nonhuman
; priority journal
; sediment
; stoichiometry
; China
; Yangtze Basin
英文摘要: Catastrophic regime shifts in shallow lakes are hard to predict due to a lack of clear understanding of the associate mechanisms. Theory of alternative stable states suggests that eutrophication has profound negative effects on the structure, function and stability of freshwater ecosystems. However, it is still unclear how eutrophication destabilizes ecosystems stoichiometrically before a tipping point is reached. The stoichiometric homeostasis (H), which links fine-scale process to broad-scale patterns, is a key parameter in ecological stoichiometry. Based on investigation of 97 shallow lakes on the Yangtze Plain, China, we measured nitrogen (N) and phosphorus (P) concentrations of the aboveground tissues of common submerged macrophyte species and their corresponding sediments. We found submerged macrophytes showed significant stoichiometric homeostasis for P (H P ) but not for N (H N ). Furthermore, H P was positively correlated with dominance and stability at the species level, and community production and stability at the community level. Identifying where macrophyte community collapse is a fundamental way to quantify their resilience. Threshold detection showed that macrophyte community dominated by high-H P species had a higher value of tipping point (0.08 vs. 0.06 mg P L −1 in lake water), indicating their strong resilience to eutrophication. In addition, macrophytes with high H P were predominant in relative oligotrophic sediments and have higher ability in stabilizing the water environment compared to those low-H P ones. Our results suggested that ecosystem dominated by homeostatic macrophyte communities was more productive, stable and resilient to eutrophication. Eutrophication-induced stoichiometric imbalance may destabilize the ecosystem by altering the community structure from high-to low-H P species. Efforts should be focused on maintaining and restoration of high homeostatic communities to make ecosystem more resilient, which can significantly improve our understanding of the critical transition mechanisms. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122150
Appears in Collections: 气候变化事实与影响
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作者单位: Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, 430072, China; Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China; College of Life Sciences, Wuhan University, Wuhan, 430072, China; College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China; State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, 810016, China; University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Su H.,Wu Y.,Xia W.,et al. Stoichiometric mechanisms of regime shifts in freshwater ecosystem[J]. Water Research,2019-01-01