Water Stress Dominates 21st‐Century Tropical Land Carbon Uptake
Water Stress Dominates 21st‐Century Tropical Land Carbon Uptake
复制标题
水资源压力主导 21 世纪热带土地碳吸收
DOI：
10.1029/2023gb007702
复制
发表时间：
2023
影响因子：
5.2
通讯作者：
Longo, Marcos
中科院分区：
文献类型：
--
作者：
Levine, Paul A.;Bloom, A. Anthony;Bowman, Kevin W.;Reager, John T.;Worden, John R.;Liu, Junjie;Parazoo, Nicholas C.;Meyer, Victoria;Konings, Alexandra G.;Longo, Marcos
水资源压力调节热带地区陆地-大气二氧化碳（CO2）交换；然而，由于辐射、温度和冠层动力学的混杂作用，其作用仍不清楚。特别是，不确定性源于植物可用水（供应）和大气水蒸气赤字（需求）作为光合碳（C）吸收变异的机械驱动因素的相对作用。利用卫星测量的重力、二氧化碳和荧光来约束2001年至2018年的机械碳水循环模型，我们发现水分胁迫对光合碳吸收的年际变化（IAV）比其他因素的综合影响大52%。令人惊讶的是，水分胁迫对碳吸收 IAV 的主导作用在潮湿的热带地区 (94%) 比在干燥的热带地区 (26%) 更大。植物可利用水供应和大气需求均对整个热带地区水分胁迫对光合碳吸收的 IAV 产生影响，但需求影响的 IAV 比供应影响的 IAV 大 21%（湿润热带地区高出 33%，干燥热带地区高出 6%）。我们发现，在整个热带地区，水分胁迫对碳吸收的IAV比其他因素组合的陆地-大气净碳汇的IAV大24%，在潮湿的热带地区大26%，在干燥的热带地区大7%。鉴于热带降水和大气湿度的最新趋势，我们的研究结果表明，来自供给和需求的水压力可能会在未来几十年内主导整个热带生态系统陆地碳汇的气候响应。
Water stress regulates land‐atmosphere carbon dioxide (CO2) exchanges in the tropics; however, its role remains poorly characterized due to the confounding roles of radiation, temperature and canopy dynamics. In particular, uncertainty stems from the relative roles of plant‐available water (supply) and atmospheric water vapor deficit (demand) as mechanistic drivers of photosynthetic carbon (C) uptake variability. Using satellite measurements of gravity, CO2and fluorescence to constrain a mechanistic carbon‐water cycle model from 2001 to 2018, we found that the interannual variability (IAV) of water stress on photosynthetic C uptake was 52% greater than the combined effects of other factors. Surprisingly, the dominance of water stress on C uptake IAV was greater in the wet tropics (94%) than in the dry tropics (26%). Plant‐available water supply and atmospheric demand both contributed to the IAV of water stress on photosynthetic C uptake across the tropics, but the IAV of demand effects was 21% greater than the IAV of supply effects (33% greater in the wet tropics and 6% greater in the dry tropics). We found that the IAV of water stress on C uptake was 24% greater than the IAV of the combination of other factors in the net land‐atmosphere C sink in the whole tropics, 26% greater in the wet tropics, and 7% greater in the dry tropics. Given the recent trends in tropical precipitation and atmospheric humidity, our findings indicate that water stress——from both supply and demand——will likely dominate the climate response of land C sink across tropical ecosystems in the coming decades.
登录
查看更多内容
影响因子：
16.2
作者：
S. Saatchi;M. Longo;Liang Xu;Yan Yang;H. Abe;Michel André;J. Aukema;N. Carvalhais;H. Cadillo-Quiroz;G. Cerbu;J. Chernela;K. Covey;L. M. Sánchez-Clavijo;Isai V. Cubillos;S. Davies;Veronique de Sy;F. De Vleeschouwer;Á. Duque;Alice Marie Sybille Durieux;Kátia De Avila Fernandes;Luis E. Fernandez;Victoria Gammino;D. Garrity;D. Gibbs;L. Gibbon;G. Y. Gowae;M. Hansen;Nancy Lee Harris;S. Healey;R. Hilton;C. Johnson;R. S. Kankeu;Nadine Therese Laporte-Goetz;H. Lee;T. Lovejoy;M. Lowman;R. Lumbuenamo;Y. Malhi;Jean-Michel M. Albert Martinez;C. Nobre;A. Pellegrini;J. Radachowsky;Francisco Román;D. Russell;D. Sheil;T. Smith;R. Spencer;F. Stolle;H. Tata;D. D. C. Torres-D.;R. Tshimanga;R. Vargas;M. Venter;Joshua West;A. Widayati;Sylvia N. Wilson;S. Brumby;A. Elmore
通讯作者：
S. Saatchi;M. Longo;Liang Xu;Yan Yang;H. Abe;Michel André;J. Aukema;N. Carvalhais;H. Cadillo-Quiroz;G. Cerbu;J. Chernela;K. Covey;L. M. Sánchez-Clavijo;Isai V. Cubillos;S. Davies;Veronique de Sy;F. De Vleeschouwer;Á. Duque;Alice Marie Sybille Durieux;Kátia De Avila Fernandes;Luis E. Fernandez;Victoria Gammino;D. Garrity;D. Gibbs;L. Gibbon;G. Y. Gowae;M. Hansen;Nancy Lee Harris;S. Healey;R. Hilton;C. Johnson;R. S. Kankeu;Nadine Therese Laporte-Goetz;H. Lee;T. Lovejoy;M. Lowman;R. Lumbuenamo;Y. Malhi;Jean-Michel M. Albert Martinez;C. Nobre;A. Pellegrini;J. Radachowsky;Francisco Román;D. Russell;D. Sheil;T. Smith;R. Spencer;F. Stolle;H. Tata;D. D. C. Torres-D.;R. Tshimanga;R. Vargas;M. Venter;Joshua West;A. Widayati;Sylvia N. Wilson;S. Brumby;A. Elmore
影响因子：
4.9
作者：
Bloom, A. A.;Williams, M.
通讯作者：
Williams, M.
影响因子：
6.7
作者：
A. Zhang;G. Jia
通讯作者：
A. Zhang;G. Jia
陆地碳循环预测的最优模型复杂度
影响因子：
4.9
作者：
Famiglietti C
通讯作者：
Famiglietti C
影响因子：
4.9
作者：
Levine, Paul A.;Randerson, James T.;Hoffman, Forrest M.
通讯作者：
Hoffman, Forrest M.