Re-evaluation of forest biomass carbon stocks and lessons from the world's most carbon-dense forests
Re-evaluation of forest biomass carbon stocks and lessons from the world's most carbon-dense forests
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DOI：
10.1073/pnas.0901970106
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发表时间：
2009-07-14
影响因子：
11.1
通讯作者：
Lindenmayer, David B.
中科院分区：
文献类型：
--
作者：
Keith, Heather;Mackey, Brendan G.;Lindenmayer, David B.
通过对已公布的全球原始森林站点生物量数据(n=136)的分析，我们发现：(I)世界上已知最高的总生物量碳密度(活的和死亡的)每公顷1,867吨碳(13个站点的平均值)出现在澳大利亚温带潮湿的雷根桉森林中，(Ii)采样的温带潮湿森林(n=44)的全球站点生物量数据的平均值高于采样的热带森林(n=36)和北方森林(n=52)(n是每个森林生物群的站点数)。政府间气候变化专门委员会生物群的空间平均缺省值低于我们温带湿润森林的平均立地值，因为温带生物群包含多种森林生态系统类型，这些类型支持一系列成熟的碳储存或具有长期的土地利用历史，减少了碳储存。我们描述了一个框架，用于根据造成高生物质碳密度的因素确定对碳储存重要的森林，这些因素包括：(1)相对较冷的温度和中等高的降水产生快速生长但分解缓慢的速率，以及(2)往往是多年生和多层的、经历了最少人类干扰的老森林。我们的成果与《联合国气候变化框架公约》下有关森林保护、管理和恢复的谈判有关。保护森林不受毁林和退化影响，储存大量生物质，可避免向大气排放大量碳，无论来源国如何，都应列入允许的缓解活动之列。同样，允许恢复森林的碳固存潜力的管理也应得到承认。
From analysis of published global site biomass data (n = 136) from primary forests, we discovered (i) the world's highest known total biomass carbon density (living plus dead) of 1,867 tonnes carbon per ha (average value from 13 sites) occurs in Australian temperate moist Eucalyptus regnans forests, and (ii) average values of the global site biomass data were higher for sampled temperate moist forests (n = 44) than for sampled tropical (n = 36) and boreal (n = 52) forests (n is number of sites per forest biome). Spatially averaged Intergovernmental Panel on Climate Change biome default values are lower than our average site values for temperate moist forests, because the temperate biome contains a diversity of forest ecosystem types that support a range of mature carbon stocks or have a long land-use history with reduced carbon stocks. We describe a framework for identifying forests important for carbon storage based on the factors that account for high biomass carbon densities, including (i) relatively cool temperatures and moderately high precipitation producing rates of fast growth but slow decomposition, and (ii) older forests that are often multiaged and multilayered and have experienced minimal human disturbance. Our results are relevant to negotiations under the United Nations Framework Convention on Climate Change regarding forest conservation, management, and restoration. Conserving forests with large stocks of biomass from deforestation and degradation avoids significant carbon emissions to the atmosphere, irrespective of the source country, and should be among allowable mitigation activities. Similarly, management that allows restoration of a forest's carbon sequestration potential also should be recognized.