Inferring CO2fertilization effect based on global monitoring land-atmosphere exchange with a theoretical model

Rising atmospheric CO2 concentration ([CO2]) enhances photosynthesis and reduces transpiration at the leaf, ecosystem, and global scale via the CO2 fertilization effect. The CO2 fertilization effect is among the most important processes for predicting the terrestrial carbon budget and future climate, yet it has been elusive to quantify. For evaluating the CO2 fertilization effect on land photosynthesis and transpiration, we developed a technique that isolated this effect from other confounding effects, such as changes in climate, using a noisy time series of observed land-atmosphere CO2 and water vapor exchange. Here, we evaluate the magnitude of this effect from 2000 to 2014 globally based on constraint optimization of gross primary productivity (GPP) and evapotranspiration in a canopy photosynthesis model over 104 global eddy-covariance stations. We found a consistent increase of GPP (0.138 ± 0.007% ppm-1; percentile per rising ppm of [CO2]) and a concomitant decrease in transpiration (-0.073% ± 0.006% ppm-1) due to rising [CO2]. Enhanced GPP from CO2 fertilization after the baseline year 2000 is, on average, 1.2% of global GPP, 12.4 g C m-2 yr-1 or 1.8 Pg C yr-1 at the years from 2001 to 2014. Our result demonstrates that the current increase in [CO2] could potentially explain the recent land CO2 sink at the global scale. © 2020 The Author(s). Published by IOP Publishing Ltd.

Ueyama M.1 , Ichii K.2, 3 , Kobayashi H.4 , Kumagai T.5, 6 , Beringer J.7 , Merbold L.8 , Euskirchen E.S.9 , Hirano T.10 , Marchesini L.B. 11, 12 , Baldocchi D.13 , Saitoh T.M.14 , Mizoguchi Y.15 , Ono K.16 , Kim J.17 , Varlagin A.18 , Kang M.19 , Shimizu T.20 , Kosugi Y.21 , Bret-Harte M.S.9 , MacHimura T.22 , Matsuura Y.1, 20 , Ohta T.24 , Takagi K.25 , Takanashi S.26 , Yasuda Y.20
Institute of Physics Publishing
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  • 1 Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-1, Gakuen-cho, Nakaku, Sakai, 599-8531, Japan
  • 2 Center for Environmental Remote Sensing, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
  • 3 Center for Global Environmental Change, National Institute for Environmental Studies, 16-2 Onokawa, Tsukuba, 305-8506, Japan
  • 4 Institute of Arctic Climate and Environment Change Research, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001, Japan
  • 5 Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
  • 6 Institute for Space-Earth Environmental Research, Nagoya University, Nagoya,Furo-cho, Chikusa-ku, 464-8601, Japan
  • 7 School of Agriculture and Environment, University of Western Australia, 35 Stirling Hwy, Crawley, Perth, WA 6009, Australia
  • 8 Mazingira Centre, International Livestock Research Institute (ILRI), PO Box 30709,00100, Nairobi, 30709, Kenya
  • 9 Institute of Arctic Biology, University of Alaska Fairbanks, 311 Irving 1 Building, Fairbanks, AK 757000, United States
  • 10 Research Faculty of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo, 060-8589, Japan
  • 11 Department of Sustainable Agro-ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
  • 12 Department of Landscape Design and Sustainable Ecosystems, Agrarian-Technological Institute, RUDN University, Miklukho-Maklaya str. 8/2, Moscow, 117198, Russian Federation
  • 13 Department of Environmental Science, Policy and Management, University of California, 345 Hilgard Hall, Office, Berkeley, CA 94720-3110, United States
  • 14 River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan
  • 15 Hokkaido Research Center, Forestry and Forest Products Research Institute, 7 Hitsujigaoka, Toyohira-ku, Sapporo, 062-8516, Japan
  • 16 Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, 3-1-3 Kannondai, Tsukuba, 305-8604, Japan
  • 17 Department of Landscape Architecture and Rural Systems Engineering, Interdisciplinary Program in Agricultural and Forest Meteorology, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
  • 18 A.N. Severtsov Institute of Ecology and Evolution Ras, Leninsky pr.33, Moscow, 119071, Russian Federation
  • 19 National Center for AgroMeteorology, 1, Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
  • 20 Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, 305-8687, Japan
  • 21 Graduate School of Agriculture, Kyoto University, Yoshidahonmachi, Kitasyirakawa oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
  • 22 Graduate School of Engineering, Osaka University, 1-1 Yamadaoka, Suita, 565-0871, Japan
  • 23 Center for International Partnerships and Research on Climate Change, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, 305-8687, Japan
  • 24 Nagoya University, Furo-cho, Chikua-ku, Nagoya, 464-8601, Japan
  • 25 Field Science Center for Northern Biosphere, Hokkaido University, Toikanbetsu, Horonobe-cho, Teshio-gun, 098-2943, Japan
  • 26 Kansai Research Center, Forestry and Forest Products Research Institute, 68 Nagaikyutarou, Momoyama-cho, 612-0855, Japan
Ключевые слова
Budget control; Constrained optimization; Evapotranspiration; Photosynthesis; Transpiration; Canopy photosynthesis; CO2 concentration; Concomitant decrease; Constraint optimizations; Global monitoring; Gross primary productivity; Theoretical modeling; Water-vapor exchange; Carbon dioxide; carbon dioxide; fertilizer application; global change; land-atmosphere interaction; theoretical study
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