A small subset of protected areas are a highly significant source of carbon emissions.
A small subset of protected areas are a highly significant source of carbon emissions.
复制标题
DOI：
10.1038/srep41902
复制
发表时间：
2017-02-10
影响因子：
4.6
通讯作者：
Mitchard ET
中科院分区：
文献类型：
--
作者：
Collins MB;Mitchard ET
保护区旨在保护多种生态系统服务。然而，并非所有人都受到良好保护。我们首次使用已发布的碳和森林损失地图，估计热带国家大型森林保护区的碳排放量（N = 2018）。我们发现PA树木中储存了36 ± 16 Pg C，占所有热带森林生物量碳的14.5%。然而，从2000年到2012年，保护区的森林损失率平均为0.18%。保护状况较低的地区经历了更高的森林损失（例如IUCN Cat III中的0.39% yr-1），但即使是最高保护状况的地区也损失了0.13% yr-1（IUCN Cat I）。排放量分布不均匀：80%的排放量来自8.3%的保护区（112 ± 49.5 Tg CO2 yr−1; n = 171）。毫无疑问，最大的排放量来自于以最大的森林总面积开始的保护区;考虑到起始森林面积并使用线性模型（r2 = 0.41）将其与碳损失相关联，我们发现1.1%的外围保护区（残差>2σ; N = 23），占保护区森林总面积的1.3%，但占所有保护区排放量的27.3%。这些结果表明，保护区是保护生物质碳的一种成功手段，但造成不成比例的高排放份额的子集应成为管理干预的紧急优先事项。
Protected areas (PAs) aim to protect multiple ecosystem services. However, not all are well protected. For the first time, using published carbon and forest loss maps, we estimate carbon emissions in large forest PAs in tropical countries (N = 2018). We found 36 ± 16 Pg C stored in PA trees, representing 14.5% of all tropical forest biomass carbon. However the PAs lost forest at a mean rate of 0.18% yr−1 from 2000–2012. Lower protection status areas experienced higher forest losses (e.g. 0.39% yr−1 in IUCN cat III), yet even highest status areas lost 0.13% yr−1 (IUCN Cat I). Emissions were not evenly distributed: 80% of emissions derived from 8.3% of PAs (112 ± 49.5 Tg CO2 yr−1; n = 171). Unsurprisingly the largest emissions derived from PAs that started with the greatest total forest area; accounting for starting forest area and relating that to carbon lost using a linear model (r2 = 0.41), we found 1.1% outlying PAs (residuals >2σ; N = 23), representing 1.3% of the total PA forest area, yet causing 27.3% of all PA emissions. These results suggest PAs have been a successful means of protecting biomass carbon, yet a subset causing a disproportionately high share of emissions should be an urgent priority for management interventions.