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'Oasis effect' in urban parks could contribute to greenhouse gas emissions, ASU study finds 新闻
来源平台:EurekAlert. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:9/0  |  提交时间:2020/11/20
Global CO2 emissions from dry inland waters share common drivers across ecosystems 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Keller, P. S.;  Catalan, N.;  von Schiller, D.;  Grossart, H-P;  Koschorreck, M.;  Obrador, B.;  Frassl, M. A.;  Karakaya, N.;  Barros, N.;  Howitt, J. A.;  Mendoza-Lera, C.;  Pastor, A.;  Flaim, G.;  Aben, R.;  Riis, T.;  Arce, M., I;  Onandia, G.;  Paranaiba, J. R.;  Linkhorst, A.;  del Campo, R.;  Amado, A. M.;  Cauvy-Fraunie, S.;  Brothers, S.;  Condon, J.;  Mendonca, R. F.;  Reverey, F.;  Room, E-, I;  Datry, T.;  Roland, F.;  Laas, A.;  Obertegger, U.;  Park, J-H;  Wang, H.;  Kosten, S.;  Gomez, R.;  Feijoo, C.;  Elosegi, A.;  Sanchez-Montoya, M. M.;  Finlayson, C. M.;  Melita, M.;  Oliveira Junior, E. S.;  Muniz, C. C.;  Gomez-Gener, L.;  Leigh, C.;  Zhang, Q.;  Marce, R.
收藏  |  浏览/下载:14/0  |  提交时间:2020/05/13
The fate of carbon in a mature forest under carbon dioxide enrichment 期刊论文
NATURE, 2020, 580 (7802) : 227-+
作者:  Sun, P. Z.;  Yang, Q.;  Kuang, W. J.;  Stebunov, Y. V.;  Xiong, W. Q.;  Yu, J.;  Nair, R. R.;  Katsnelson, M. I.;  Yuan, S. J.;  Grigorieva, I. V.;  Lozada-Hidalgo, M.;  Wang, F. C.;  Geim, A. K.
收藏  |  浏览/下载:70/0  |  提交时间:2020/05/13

Carbon dioxide enrichment of a mature forest resulted in the emission of the excess carbon back into the atmosphere via enhanced ecosystem respiration, suggesting that mature forests may be limited in their capacity to mitigate climate change.


Atmospheric carbon dioxide enrichment (eCO(2)) can enhance plant carbon uptake and growth(1-5), thereby providing an important negative feedback to climate change by slowing the rate of increase of the atmospheric CO2 concentration(6). Although evidence gathered from young aggrading forests has generally indicated a strong CO2 fertilization effect on biomass growth(3-5), it is unclear whether mature forests respond to eCO(2) in a similar way. In mature trees and forest stands(7-10), photosynthetic uptake has been found to increase under eCO(2) without any apparent accompanying growth response, leaving the fate of additional carbon fixed under eCO(2) unclear(4,5,7-11). Here using data from the first ecosystem-scale Free-Air CO2 Enrichment (FACE) experiment in a mature forest, we constructed a comprehensive ecosystem carbon budget to track the fate of carbon as the forest responded to four years of eCO(2) exposure. We show that, although the eCO(2) treatment of +150 parts per million (+38 per cent) above ambient levels induced a 12 per cent (+247 grams of carbon per square metre per year) increase in carbon uptake through gross primary production, this additional carbon uptake did not lead to increased carbon sequestration at the ecosystem level. Instead, the majority of the extra carbon was emitted back into the atmosphere via several respiratory fluxes, with increased soil respiration alone accounting for half of the total uptake surplus. Our results call into question the predominant thinking that the capacity of forests to act as carbon sinks will be generally enhanced under eCO(2), and challenge the efficacy of climate mitigation strategies that rely on ubiquitous CO2 fertilization as a driver of increased carbon sinks in global forests.


  
Influences of light and humidity on carbonyl sulfide-based estimates of photosynthesis 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (7) : 2470-2475
作者:  Kooijmans, Linda M. J.;  Sun, Wu;  Aalto, Juho;  Erkkila, Kukka-Maaria;  Maseyk, Kadmiel;  Seibt, Ulrike;  Vesala, Timo;  Mammarella, Ivan;  Chen, Huilin
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/27
carbonyl sulfide  photosynthesis  stomatal conductance  carbon cycle  
Shallow particulate organic carbon regeneration in the South Pacific Ocean 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (20) : 9753-9758
作者:  Pavia, Frank J.;  Anderson, Robert F.;  Lam, Phoebe J.;  Cael, B. B.;  Vivancos, Sebastian M.;  Fleisher, Martin Q.;  Lu, Yanbin;  Zhang, Pu;  Cheng, Hai;  Edwards, R. Lawrence
收藏  |  浏览/下载:12/0  |  提交时间:2019/11/27
biological pump  ocean carbon storage  oxygen-deficient zones  GEOTRACES  thorium  
Drivers and mechanisms of ocean deoxygenation 期刊论文
NATURE GEOSCIENCE, 2018, 11 (7) : 467-473
作者:  Oschlies, Andreas;  Brandt, Peter;  Stramma, Lothar;  Schmidtko, Sunke
收藏  |  浏览/下载:9/0  |  提交时间:2019/04/09
Allometric scaling of estuarine ecosystem metabolism 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (26) : 6733-6738
作者:  Nidzieko, Nicholas J.
收藏  |  浏览/下载:10/0  |  提交时间:2019/11/27
ecosystem metabolism  estuaries  primary production  allometric scaling  metabolic theory  
Contrasting carbon cycle responses of the tropical continents to the 2015-2016 El Nino 期刊论文
SCIENCE, 2017, 358 (6360)
作者:  Liu, Junjie;  39;Dell, Christopher W.
收藏  |  浏览/下载:0/0  |  提交时间:2019/11/27
Long-term pattern and magnitude of soil carbon feedback to the climate system in a warming world 期刊论文
SCIENCE, 2017, 358 (6359) : 101-104
作者:  Melillo, J. M.;  Frey, S. D.;  DeAngelis, K. M.;  Werner, W. J.;  Bernard, M. J.;  Bowles, F. P.;  Pold, G.;  Knorr, M. A.;  Grandy, A. S.
收藏  |  浏览/下载:8/0  |  提交时间:2019/11/27
Carbon dioxide sources from Alaska driven by increasing early winter respiration from Arctic tundra 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2017, 114 (21) : 5361-5366
作者:  Commane, Roisin;  Lindaas, Jakob;  Benmergui, Joshua;  Luus, Kristina A.;  Chang, Rachel Y. -W.;  Daube, Bruce C.;  Euskirchen, Eugenie S.;  Henderson, John M.;  Karion, Anna;  Miller, John B.;  Miller, Scot M.;  Parazoo, Nicholas C.;  Randerson, James T.;  Sweeney, Colm;  Tans, Pieter;  Thoning, Kirk;  Veraverbeke, Sander;  Miller, Charles E.;  Wofsy, Steven C.
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
carbon dioxide  Arctic  early winter respiration  Alaska  tundra