Global estimates of boreal forest carbon stocks and flux
Global estimates of boreal forest carbon stocks and flux
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DOI：
10.1016/j.gloplacha.2015.02.004
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发表时间：
2015-05-01
影响因子：
3.9
通讯作者：
Warkentin, Ian G.
中科院分区：
文献类型：
--
作者：
Bradshaw, Corey J. A.;Warkentin, Ian G.
北方生态系统是全球重要的碳储存库，也是各种生物群落的避风港。那里的自然干扰动态历来是由火和昆虫驱动的，人类干预的干扰比全球其他生物群增加得更快。之前对北方地区总碳储量的研究和对其未来流量的预测表明，区域模式存在很高的不确定性。我们回顾并标准化了这些广泛的量化文献，以提供对北方森林全球碳平衡的最新和最全面的估计。我们还汇编了对碳预算流量的百年尺度预测。我们的审查和标准化证实了现有数据的高度不确定性，但有证据表明，该地区的总碳储量被低估了。我们发现了总的碳储量为3,673到1715.8加仑(10(15)克)，其中点(1095加仑)是之前任何平均估计的13到3.8倍。大多数北方碳存在于土壤和泥炭地中，尽管估计值高度不确定。我们发现有证据表明，在碳吸收速度至少从20世纪80年代开始下降后，该地区可能成为净碳源。考虑到北方地区可能构成世界上最大的陆地碳源，在全球变暖最迅速的地区之一(沃尔什，2014)，我们如何管理这些储量将对未来的气候动态产生影响。(C)2015爱思唯尔B.V.保留所有权利。
The boreal ecosystem is an important global reservoir of stored carbon and a haven for diverse biological communities. The natural disturbance dynamics there have historically been driven by fire and insects, with human-mediated disturbances increasing faster than in other biomes globally. Previous research on the total boreal carbon stock and predictions of its future flux reveal high uncertainty in regional patterns. We reviewed and standardised this extensive body of quantitative literature to provide the most up-to-date and comprehensive estimates of the global carbon balance in the boreal forest. We also compiled century-scale predictions of the carbon budget flux. Our review and standardisation confirmed high uncertainty in the available data, but there is evidence that the region's total carbon stock has been underestimated. We found a total carbon store of 3673 to 1715.8 Pg (10(15) g), the mid-point of which (1095 Pg) is between 13 and 3.8 times larger than any previous mean estimates. Most boreal carbon resides in its soils and peatlands, although estimates are highly uncertain. We found evidence that the region might become a net carbon source following a reduction in carbon uptake rate from at least the 1980s. Given that the boreal potentially constitutes the largest terrestrial carbon source in the world, in one of the most rapidly warming parts of the globe (Walsh, 2014), how we manage these stocks will be influential on future climate dynamics. (C) 2015 Elsevier B.V. All rights reserved.