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Forskningsartikel2023Vetenskapligt granskad

Temporal variations of carbon and water fluxes in a subtropical mangrove forest: Insights from a decade-long eddy covariance measurement

Gou, Ruikun; Buchmann, Nina; Chi, Jinshu; Luo, Yunpeng; Mo, Lidong; Shekhar, Ankit; Feigenwinter, Iris; Hortnagl, Lukas; Lu, Weizhi; Cui, Xiaowei; Meng, Yuchen; Song, Shanshan; Lin, Guangxuan; Chen, Yuechao; Liang, Jie; Guo, Jiemin; Peng, Haijun; Lin, Guanghui

Sammanfattning

Mangroves, highly efficient ecosystems in sequestering CO2, are strongly impacted by climate change. The lack of long-term observation in mangroves hinders the evaluation of seasonal and inter-annual variability in carbon and water fluxes and their responses to various environmental drivers. In this study, we measured net ecosystem CO2 exchange and evapotranspiration between the atmosphere and subtropical mangroves using the eddy covariance technique over a decade (2010-2019) in southern China. This mangrove forest acted as a strong CO2 sink, with annual net ecosystem production (NEP) ranging from 622.5 to 832.8 g C m(-2) year(-1). The annual evapotranspiration (ET) varied between 934.6 and 1004.9 mm year(-1). During the study period, ET consistently remained higher in the wet season (May to October) compared to the dry season, while NEP did not exhibit consistent seasonal variation. Path analysis indicated that during the dry season, NEP was primarily influenced by global solar radiation and vapor pressure deficit. However, in the wet season, NEP was regulated by a combination of global solar radiation, vapor pressure deficit, air temperature, and tidal inundation time. Additionally, the promoting effect of global solar radiation on NEP decreased in the wet season, while the inhibitory influences of higher temperature and vapor pressure deficit on NEP intensified during the period. Unlike NEP, the dominant factors affecting ET (global solar radiation, air temperature, and vapor pressure deficit) and their intensities remained relatively consistent during both seasons. Furthermore, the relative importance of global solar radiation on NEP and ET increased over the decade, while the influence of tidal inundation time diminished. This study not only improves the understanding of the response of subtropical mangroves to climate change but also provides a valuable benchmark dataset to validate the interannual variability of mangrove carbon and water fluxes estimated from the models.

Nyckelord

Coastal wetland; Blue carbon; Net ecosystem production; CO2 budget; Evapotranspiration

Publicerad i

Agricultural and Forest Meteorology
2023, Volym: 343, artikelnummer: 109764
Utgivare: ELSEVIER

    Globala målen

    SDG13 Bekämpa klimatförändringarna

    UKÄ forskningsämne

    Meteorologi och atmosfärforskning
    Skogsvetenskap

    Publikationens identifierare

    DOI: https://doi.org/10.1016/j.agrformet.2023.109764

    Permanent länk till denna sida (URI)

    https://res.slu.se/id/publ/126970