caa a22 4500 467885672 CHVBK 20180406152733.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s10021-006-0029-x doi (NATIONALLICENCE)springer-10.1007/s10021-006-0029-x Carbon Dioxide Dynamics and Controls in a Deep-water Wetland on the Qinghai-Tibetan Plateau [Elektronische Daten] [Mitsuru Hirota, Yanhong Tang, Qiwu Hu, Shigeki Hirata, Tomomichi Kato, Wenhong Mo, Guangmin Cao, Shigeru Mariko] To initially characterize the dynamics and environmental controls of CO2, ecosystem CO2 fluxes were measured for different vegetation zones in a deep-water wetland on the Qinghai-Tibetan Plateau during the growing season of 2002. Four zones of vegetation along a gradient from shallow to deep water were dominated, respectively by the emergent species Carex allivescens V. Krez., Scirpus distigmaticus L., Hippuris vulgaris L., and the submerged species Potamogeton pectinatus L. Gross primary production (GPP), ecosystem respiration (Re), and net ecosystem production (NEP) were markedly different among the vegetation zones, with lower Re and GPP in deeper water. NEP was highest in the Scirpus-dominated zone with moderate water depth, but lowest in the Potamogeton-zone that occupied approximately 75% of the total wetland area. Diurnal variation in CO2 flux was highly correlated with variation in light intensity and soil temperature. The relationship between CO2 flux and these environmental variables varied among the vegetation zones. Seasonal CO2 fluxes, including GPP, Re, and NEP, were strongly correlated with aboveground biomass, which was in turn determined by water depth. In the early growing season, temperature sensitivity (Q10) for Re varied from 6.0 to 8.9 depending on vegetation zone. Q10 decreased in the late growing season. Estimated NEP for the whole deep-water wetland over the growing season was 24 g C m−2. Our results suggest that water depth is the major environmental control of seasonal variation in CO2 flux, whereas photosynthetic photon flux density (PPFD) controls diurnal dynamics. Springer Science+Business Media, Inc., 2006 alpine ecosystem nationallicence aquatic plants nationallicence NEP nationallicence water depth nationallicence wetland nationallicence zonal vegetation nationallicence Hirota Mitsuru National Institute for Environmental Studies, Onogawa 16-2, 305-8506, Tsukuba, Ibaraki, Japan aut Tang Yanhong National Institute for Environmental Studies, Onogawa 16-2, 305-8506, Tsukuba, Ibaraki, Japan aut Hu Qiwu Northwest Plateau Institute of Biology, Chinese Academy of Science, 810001, Xining, People's Republic of China aut Hirata Shigeki Graduate School of Life and Environmental Sciences, University of Tsukuba, 305-8572, Tsukuba, Ibaraki, Japan aut Kato Tomomichi Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, 236-0001, Yokohama City, Kanagawa, Japan aut Mo Wenhong Institute of Biological Sciences, University of Tsukuba, 305-8572, Tsukuba, Ibaraki, Japan aut Cao Guangmin Northwest Plateau Institute of Biology, Chinese Academy of Science, 810001, Xining, People's Republic of China aut Mariko Shigeru Institute of Biological Sciences, University of Tsukuba, 305-8572, Tsukuba, Ibaraki, Japan aut Ecosystems Springer-Verlag; www.springer-ny.com 9/4(2006-06-01), 673-688 1432-9840 9:4<673 2006 9 10021 https://doi.org/10.1007/s10021-006-0029-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-006-0029-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hirota Mitsuru National Institute for Environmental Studies, Onogawa 16-2, 305-8506, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Tang Yanhong National Institute for Environmental Studies, Onogawa 16-2, 305-8506, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Hu Qiwu Northwest Plateau Institute of Biology, Chinese Academy of Science, 810001, Xining, People's Republic of China aut NATIONALLICENCE 700 1- Hirata Shigeki Graduate School of Life and Environmental Sciences, University of Tsukuba, 305-8572, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Kato Tomomichi Frontier Research Center for Global Change, 3173-25 Showa-machi, Kanazawa-ku, 236-0001, Yokohama City, Kanagawa, Japan aut NATIONALLICENCE 700 1- Mo Wenhong Institute of Biological Sciences, University of Tsukuba, 305-8572, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Cao Guangmin Northwest Plateau Institute of Biology, Chinese Academy of Science, 810001, Xining, People's Republic of China aut NATIONALLICENCE 700 1- Mariko Shigeru Institute of Biological Sciences, University of Tsukuba, 305-8572, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/4(2006-06-01), 673-688 1432-9840 9:4<673 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer