Upturn in secondary forest clearing buffers primary forest loss in the Brazilian Amazon
Upturn in secondary forest clearing buffers primary forest loss in the Brazilian Amazon
复制标题
次生林砍伐的增加缓冲了巴西亚马逊地区原始森林的损失
DOI：
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发表时间：
2020
影响因子：
27.6
通讯作者：
D. Galbraith
中科院分区：
文献类型：
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作者：
Yunxia Wang;G. Ziv;M. Adami;C. Almeida;J. Antunes;A. Coutinho;J. Esquerdo;A. Gomes;D. Galbraith
巴西拥有亚马逊雨林的三分之二，是亚马逊森林损失最多的国家。自2004年以来，巴西亚马逊地区的原生林损失大幅减少，但次生林损失从未被量化。我们使用最近开发的高分辨率土地利用/土地覆盖数据集跟踪在巴西亚马逊超过14年的次生林，提供该地区的次生林损失的第一个估计。结果表明，2008 - 2014年，次生林损失增加了（187 ± 48）%。次生林占森林损失总量的比例从2000年的（37 ± 3）%上升到2014年的（72 ± 5）%。整个区域的次生林损失最近都在加速，这不仅仅是由于次生林面积的增加，而可能是有意识地倾向于清除很少受到保护的森林生态系统（次生林）。我们的研究结果表明，次生林的损失减轻了砍伐森林对原始森林的压力。然而，在我们的研究期间，这是以损失2.59-2.66 Pg C的碳封存机会为代价的。巴西亚马逊地区的森林砍伐既影响到较老的森林（原始森林），也影响到较年轻的森林（次生林）。这项研究发现，2008-2014年期间，大部分森林损失来自次生林，森林砍伐增加近190%，缓冲了原始林的损失。
Brazil contains two-thirds of remaining Amazonian rainforests and is responsible for the most Amazon forest loss. Primary forest loss in the Brazilian Amazon has declined considerably since 2004 but secondary forest loss has never been quantified. We use a recently developed high-resolution land use/land cover dataset to track secondary forests in the Brazilian Amazon over 14 yr, providing the first estimates of secondary forest loss for the region. We find that secondary forest loss increased by (187 ± 48)% from 2008 to 2014. Moreover, the proportion of total forest loss accounted for by secondary forests rose from (37 ± 3)% in 2000 to (72 ± 5)% in 2014. The recent acceleration in secondary forests loss occurred across the entire region and was not driven simply by increasing secondary forest area but probably a conscious preferential shift towards clearance of a little-protected forest ecosystem (secondary forests). Our results suggest that secondary forests loss has eased deforestation pressure on primary forests. However, this has been at the expense of a lost carbon sequestration opportunity of 2.59–2.66 Pg C over our study period. Deforestation in the Brazilian Amazon affects both older (primary) and younger (secondary) forests. This study finds that most forest loss over the period 2008–2014 was from secondary forests and that the almost 190% rise in deforestation buffered losses from primary forests.