Botanica Pacifica. A journal of plant science and conservation 2020.9(2):61-72
Article first published online: 24 JUL 2020 | DOI: 10.17581/bp.2020.09207
Interspecific variation in foliar nutrients and isotopes of submerged macrophytes in the Cau Hai Lagoon, the typical brackish lagoon in Vientam
Dang Thi Nhu Y1,2, Nguyen Tien Hoang7, Pham Khac Lieu3, Hidenori Harada5, Keisuke Koba4, Natacha Brion6, Duong Van Hieu8, Nguyen Van Hop8, Tim Sierens1 & Harry Olde Venterink1
1 Department of Biology, Vrije Universiteit Brussel (VUB), Brussels, Belgium
2 VNUK Institute for Research and Executive Education, The University of Danang, Danang, Vietnam
3 Department of Science, Technology and Environment, Hue University, Hue, Vietnam
4 Center for Ecological Research, Kyoto University, Otsu, Shiga 520–2113, Japan
5 Graduate School of Global Environmental Studies, Kyoto University, Kyoto 606–8501, Japan
6 Analytical, Environmental and Geochemistry, Vrije Universiteit Brussel (VUB), Brussels, Belgium
7 Laboratory of Environmental Geosphere Engineering, Department of Urban Management, Graduate School of Engineering, Kyoto University, Kyoto 615–8540, Japan
8 College of Sciences, Hue University, Hue, Vietnam
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.
Данг Ти Нху И, Нгуен Тиен Хоанг, Фам Хак Лию, Харада Х., Коба К., Брион Н., Ван Хью Д., Ван Хоп Н., Сиренз Т., Вентеринк Г.О. Межвидовая изменчивость листовых питательных веществ и изотопов погруженных видов макрофитов в лагуне Кау Хай - типичной солоноватой лагуне Вьетнама. Погруженные макрофиты являются ключевыми компонентами мелководных прибрежных экосистем. В глобальном масштабе их сообщества существенно сократились из-за антропогенных нарушений и изменения климата. Элементные и изотопные составы листьев макрофитов все чаще используются для определения их пищевого статуса и условий окружающей среды, включая потенциальные стрессовые факторы, для чего необходимо понимание их межвидовой изменчивости. В настоящей работе мы представляем результаты исследования межвидовых вариаций внекорневых питательных веществ (C, N, P) и стабильных изотопов (δ13C и δ15N) четырех видов макрофитов: Najas indica, Halophila beccarii, Halodule uninervis, Halophila ovalis в лагуне Кау-Хай (Вьетнам) в зависимости от ключевых переменных окружающей среды. Содержания C, N, значения δ13C и δ15N варьировали в зависимости от вида и были связаны с соленостью, глубиной воды и/или концентрацией DIN. Содержание N и значения C:N коррелировали с концентрацией DIN в воде у N. indica и H. beccarii, тогда как значения C:P коррелировали с концентрацией P в детрите (N. indica) или в толще воды (H. uninervis). δ13C у H. beccarii и H. uninervis увеличивалась с повышением солености, а δ15N у N. indica – как с повышением солености, так и с концентрацией DIN в воде. Макрофиты различались в стратегиях потребления ресурсов (например, поглощение CO2 или HCO3–, N и P из различных источников), в их использовании (например, инвестиции C в структурные ткани), а также по их реакции на изменения солености, глубины воды и концентрации DIN в воде. Изученные макрофиты находились в условиях доступности N и P, а фиксация С ингибировалась другими факторами..
Keywords: Najas, Halophila, Halodule, salinity, depth, DIN, phosphorus, соленость, глубина, фосфор
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