Fires increase Amazon forest productivity through increases in diffuse radiation
Fires increase Amazon forest productivity through increases in diffuse radiation
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DOI：
10.1002/2015gl063719
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发表时间：
2015-06
影响因子：
5.2
通讯作者：
A. Rap;D. Spracklen;L. Mercado;C. Reddington;J. Haywood;R. Ellis;O. Phillips;P. Artaxo;D. Bonal;N. R. Coupe;N. Butt
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文献类型：
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作者：
A. Rap;D. Spracklen;L. Mercado;C. Reddington;J. Haywood;R. Ellis;O. Phillips;P. Artaxo;D. Bonal;N. R. Coupe;N. Butt
大气气溶胶散射太阳辐射，增加了散射辐射的比例和光合作用的效率。我们量化了1998-2007年期间生物质燃烧气溶胶（BBA）对亚马逊河流域漫辐射和植物光合作用的影响。对观测到的气溶胶光学厚度的评价使我们能够提供较低和较高的BBA排放量估计。BBA使亚马逊流域年平均漫射辐射增加3.4-6.8%，净初级生产力增加1.4- 2.8%，引用的范围由BBA排放的不确定性驱动。亚马逊河流域NPP增加78-156 Tg C a−1相当于生物质燃烧产生的年度区域碳排放量的33-65%。这种净初级生产力的增加发生在旱季，抵消了干旱对热带生产的一些影响。我们估计，这种NPP增强中有30-60 Tg C a-1发生在木质组织中，占亚马逊成熟森林观测到的碳汇的8-16%。
Atmospheric aerosol scatters solar radiation increasing the fraction of diffuse radiation and the efficiency of photosynthesis. We quantify the impacts of biomass burning aerosol (BBA) on diffuse radiation and plant photosynthesis across Amazonia during 1998–2007. Evaluation against observed aerosol optical depth allows us to provide lower and upper BBA emissions estimates. BBA increases Amazon basin annual mean diffuse radiation by 3.4–6.8% and net primary production (NPP) by 1.4–2.8%, with quoted ranges driven by uncertainty in BBA emissions. The enhancement of Amazon basin NPP by 78–156 Tg C a−1 is equivalent to 33–65% of the annual regional carbon emissions from biomass burning. This NPP increase occurs during the dry season and acts to counteract some of the observed effect of drought on tropical production. We estimate that 30–60 Tg C a−1 of this NPP enhancement is within woody tissue, accounting for 8–16% of the observed carbon sink across mature Amazonian forests.