Shifts in plant and soil C, N and P accumulation and C:N:P stoichiometry associated with flooding intensity in subtropical estuarine wetlands in China

Weiqi Wang, Jordi Sardans, Chun Wang, Congsheng Zeng, Chuan Tong, Mireia Bartrons, Dolores Asensio, Josep Peñuelas

    Research output: Contribution to journalArticleResearch

    5 Citations (Scopus)

    Abstract

    © 2018 Flooding caused by rising sea levels can influence the biogeochemistry of estuarine wetland ecosystems. We studied the relationships of higher flooding intensity with soil carbon (C), nitrogen (N) and phosphorus (P) concentrations in communities of the native sedge Cyperus malaccensis var. brevifolius Boecklr. in the wetlands of the Minjiang River estuary in China. The aboveground and total biomasses of C. malaccensis were higher in high-flooding habitats than in intermediate- and low-flooding habitats. These differences in plant biomass were accompanied by a lower N:P ratio in the aboveground biomass and a higher N:P ratio in the belowground biomass. Higher intensities of flooding were associated with higher soil N and P concentrations in intermediate and deep soil layers. The higher P concentration under flooding was mainly associated with the higher clay content, whereas the higher N concentration was associated with higher salinity. Flooding intensity did not have a net total effect on soil total C concentration. The positive direct effect of flooding intensity on total soil C concentration was counteracted by its positive effects on CH4 emissions and soil salinity. The results suggest that C. malaccensis wetlands will be able to maintain and even increase the current C, N and P storage capacity of the ecosystem under moderate increases of flooding in the Minjiang River estuary.
    Original languageEnglish
    Pages (from-to)172-184
    JournalEstuarine, Coastal and Shelf Science
    Volume215
    DOIs
    Publication statusPublished - 31 Dec 2018

    Keywords

    • C:N
    • Climate change
    • Cyperus malaccensis
    • N:P
    • Nitrogen
    • Nutrient stoichiometry
    • Phosphorus
    • Storage
    • Wetland

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