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Interspecific variation in foliar nutrients and isotopes of submerged macrophytes in the Cau Hai Lagoon, the typical brackish lagoon in Vietnam

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Submersed macrophytes are key elements of shallow coastal ecosystems but globally declined due to anthropogenic disturbances and climate change. Foliar elemental and isotopic compositions of macrophytes are being increasingly used to identify nutritional status and environmental conditions including potential stress factors, thereto insight is required in its interspecific variation. In this paper, we present interspecific variations in foliar nutrients (C, N, P) and stable isotopes (δ13C and δ15N) of four macrophyte species (Najas indica, Halophila beccarii, Halodule uninervis, Halophila ovalis) in Cau Hai lagoon (Vietnam) in relation to key environmental variables. The foliar C, N, δ13C and δ15N values varied among species and related to salinity, water depth and/or DIN concentrations. Foliar N and C:N values were correlated to DIN concentration in the water (N. indica and H. beccarii, respectively), whereas foliar C:P was correlated to P concentrations in sediment (N. indica) or water depth (H. uninervis). Foliar δ13C of H. beccarii and H. uninervis increased with salinity and δ15N of N. indica with both salinity and DIN concentration in the water. These aquatic plants likely varied either in resource acquisition strategies (e.g. uptake of CO2 or HCO3 –, N and P from different sources) or in their usage (e.g. C investment in structural tissue) and in their response to changes in salinity, water depth and DIN concentration in the water. The studied macrophytes likely experienced relatively high N and P availability and another factor than P or N probably inhibited C-fixation and/or carbon storage of these plants.
Tijdschrift: Botanica Pacifica
ISSN: 2410-3713
Issue: 2
Volume: 9
Pagina's: 1-13
Jaar van publicatie:2020
Trefwoorden:Najas, Halophila, Halodule, salinity, depth, DIN, Phosphorus
Toegankelijkheid:Open