Gas exchange characteristics of Gulf of Mexico coastal marsh macrophytes |
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| Institution: | 1. Natural Resources Institute Finland, University of Oulu, P.O. Box 413, FI-90014, Oulu, Finland;2. Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014, Helsinki, Finland;3. Natural Resources Institute Finland, Latokartanonkaari 9, 00790, Helsinki, Finland;4. Department of Ecology, University of Oulu, FI-90014, University of Oulu, Finland;1. 2020 Horns Point Road, Horn Point Laboratory, Center for Environmental Science, University of Maryland, Cambridg, MD, 21613, USA;2. Midshore Riverkeeper Conservancy, Easton, MD, 21601, USA;3. EarthData Inc., Centreville, MD, 21617, USA;1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Changchun University, Changchun 130022, PR China;1. CIRAD, UMR G-EAU, Tunis, Tunisia;2. G-EAU, AgroParisTech, Cirad, IRD, IRSTEA, MontpellierSupAgro, Univ Montpellier, Montpellier, France;3. Géosciences Environnement Toulouse (GET), CNRS, IRD, Université de Toulouse, Toulouse, France;4. Kenya Water Towers Agency, Nairobi, Kenya;5. UMR “Patrimoines locaux et gouvernance” (PALOC), IRD, MNHN, 57 rue Cuvier, CP 51, 75005 Paris, France;6. IRD, UMR LISAH, 34060 Montpellier, France;1. Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 599-8531, Japan;2. Teshio Experimental Forest, Hokkaido University, Horonobe, 098-2943, Japan;1. Jiangxi Province Key Laboratory of the causes and control of Atmospheric pollution, School of Water Resources and Environmental Engineering, Key Laboratory of Nuclear Resources and Environment (Ministry of Education), East China University of Technology, Nanchang 330013, China;2. Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China |
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| Abstract: | Gas exchange characteristics of three major Louisiana Mississippi River deltaic plain marsh species, Spartina patens (Ait.) Muhl., Spartina altemiflora Lois., and Panicum hemitomon Shult., was studied under controlled environment conditions. The optimum temperature for maximum photosynthesis was ≈ 36 °C for S. patens, 27 °C for S. alterniflora, and 28 °C for rP. hemitomon. Net photosynthesis rates at optimum temperature averaged 20.1 μmol · mt-2 · st-1 in S. patens, 22.8 μmol · m−2 · s−1 in S. alterniflora, and 11.4 μmol · m−2 · s−1 in P. hemitomon. Photosynthetic light saturation occurred ≈720, 530, and 750 μmol · m−2 · s−1 in S. patens, S. alterniflora, and P. hemitomon, respectively. Only S. patens had a midday depression of stomatal conductance, but net photosynthesis was not reduced by the depression. Maximum stomatal conductances were 285 mmol · m−2 · s−1 in S. patens, 238 mmol · m−2 · s−1 in S. alterniflora, and 335 mmol · m−2 · s−1 in P. hemitomon. In contract, net photosynthesis values were lower in P. hemitomon compared with the Spartina species, indicating a greater degree of water use efficiency of photosynthesis for both Spartina species. |
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