Aboveground forest biomass varies across continents, ecological zones and successional stages: refined IPCC default values for tropical and subtropical forests

Aboveground forest biomass varies across continents, ecological zones and successional stages: refined IPCC default values for tropical and subtropical forests
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地上森林生物量因大陆、生态区和演替阶段而异:热带和亚热带森林的IPCC默认值的精炼

DOI:
10.1088/1748-9326/ac45b3
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发表时间:
2022
影响因子:
6.7
通讯作者:
Rozendaal D
Rozendaal D
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Rozendaal D

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为了监测和报告森林碳储量和通量,许多热带和亚热带国家依赖政府间气候变化专门委员会(气专委)国家温室气体清单指南中森林地上生物量的默认值。IPCC森林AGB默认值源自2006年,是对每个大陆和生态区平均值的相对粗略估计。2006年的默认值是基于当时有限的地块数据,其推导方法并不完全清楚,也没有对演替阶段进行区分。作为2019年对《2006年IPCC温室气体清单指南》进行完善的一部分,我们根据来自天然林中> 25000个样地的AGB数据和没有样地数据的全球AGB地图更新了热带和亚热带森林的默认AGB值。我们计算了每个大陆,生态区和演替阶段的改进AGB默认值,并提供了一个衡量不确定性的标准。热带和亚热带森林中的AGB在大陆、生态区和演替阶段之间有一个数量级的差异。我们改进的默认值通常反映了热带地区的气候梯度,潮湿地区的AGB更多。AGB在古老的森林中一般高于次生林,在古老的次生林(再生>20年和退化/砍伐的森林)中高于年轻的次生林(> 20年)。虽然改进后的热带原始森林默认值与2006年以前的默认值基本相似,但新的默认值对于年轻的次生林要低4.0-7.7倍。因此,精确值将强烈改变估计的碳储量和通量,并强调原始森林保护的至关重要性。我们提供了一种可重复的方法,以促进未来的改进,并鼓励有针对性的努力,在数据空白的地区建立永久性的地块。
For monitoring and reporting forest carbon stocks and fluxes, many countries in the tropics and subtropics rely on default values of forest aboveground biomass (AGB) from the Intergovernmental Panel on Climate Change (IPCC) guidelines for National Greenhouse Gas (GHG) Inventories. Default IPCC forest AGB values originated from 2006, and are relatively crude estimates of average values per continent and ecological zone. The 2006 default values were based on limited plot data available at the time, methods for their derivation were not fully clear, and no distinction between successional stages was made. As part of the 2019 Refinement to the 2006 IPCC Guidelines for GHG Inventories, we updated the default AGB values for tropical and subtropical forests based on AGB data from >25 000 plots in natural forests and a global AGB map where no plot data were available. We calculated refined AGB default values per continent, ecological zone, and successional stage, and provided a measure of uncertainty. AGB in tropical and subtropical forests varies by an order of magnitude across continents, ecological zones, and successional stage. Our refined default values generally reflect the climatic gradients in the tropics, with more AGB in wetter areas. AGB is generally higher in old-growth than in secondary forests, and higher in older secondary (regrowth >20 years old and degraded/logged forests) than in young secondary forests (⩽20 years old). While refined default values for tropical old-growth forest are largely similar to the previous 2006 default values, the new default values are 4.0–7.7-fold lower for young secondary forests. Thus, the refined values will strongly alter estimated carbon stocks and fluxes, and emphasize the critical importance of old-growth forest conservation. We provide a reproducible approach to facilitate future refinements and encourage targeted efforts to establish permanent plots in areas with data gaps.
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