期刊
NATURE
卷 458, 期 7241, 页码 1014-U87出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature07949
关键词
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资金
- UK Natural Environment Research Council
- UK Department for Environment, Food and Rural Affairs (Defra)
- UK Ministry of Defence (MoD) [GA01101, CBC/2B/0417_Annex C5]
- Swiss NCCR Climate
- NERC [earth010002] Funding Source: UKRI
- Natural Environment Research Council [earth010002, ceh010023] Funding Source: researchfish
Plant photosynthesis tends to increase with irradiance. However, recent theoretical and observational studies have demonstrated that photosynthesis is also more efficient under diffuse light conditions(1-5). Changes in cloud cover or atmospheric aerosol loadings, arising from either volcanic or anthropogenic emissions, alter both the total photosynthetically active radiation reaching the surface and the fraction of this radiation that is diffuse, with uncertain overall effects on global plant productivity and the land carbon sink. Here we estimate the impact of variations in diffuse fraction on the land carbon sink using a global model modified to account for the effects of variations in both direct and diffuse radiation on canopy photosynthesis. We estimate that variations in diffuse fraction, associated largely with the 'global dimming' period(6-8), enhanced the land carbon sink by approximately one-quarter between 1960 and 1999. However, under a climate mitigation scenario for the twenty-first century in which sulphate aerosols decline before atmospheric CO2 is stabilized, this 'diffuse-radiation' fertilization effect declines rapidly to near zero by the end of the twenty-first century.
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