Less than half of anthropogenic carbon dioxide emissions remain in the atmosphere. While carbon balance models imply large carbon uptake in tropical forests, direct on-the-ground observations are still lacking in Southeast Asia. Here, using long-term plot monitoring records of up to half a century, we find that intact forests in Borneo gained 0.43 Mg C ha‾¹ per year (95% CI 0.14—0.72, mean period 1988-2010) above-ground live biomass. These results closely match those from African and Amazonian plot networks, suggesting that the world's remaining intact tropical forests are now en masse out-of-equilibrium. Although both pan-tropical and long-term, the sink in remaining intact forests appears vulnerable to climate and land use changes. Across Borneo the 1997-1998 El Niño drought temporarily halted the carbon sink by increasing tree mortality, while fragmentation persistently offset the sink and turned many edge-affected forests into a carbon source to the atmosphere.
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机译：不到一半的人为二氧化碳排放量保留在大气中。尽管碳平衡模型意味着热带森林中的大量碳吸收，但东南亚仍缺乏直接的实地观测。在这里，使用长达半个世纪的长期样地监测记录，我们发现婆罗洲的完整森林每年在地上生活的面积每年增长0.43 Mg C ha‾¹（95％CI 0.14-0.72，平均时期1988-2010）。生物质。这些结果与非洲和亚马逊地区的样地网络的结果非常吻合，表明世界上其余完整的热带森林现在总体上处于失衡状态。尽管既是泛热带的又是长期的，但仍保留在完整森林中的汇点似乎容易受到气候和土地利用变化的影响。在整个婆罗洲，1997-1998年的厄尔尼诺大旱通过增加树木死亡率而暂时阻止了碳汇，而碎片不断地抵消了碳汇，并使许多受边缘影响的森林成为大气中的碳源。
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