野生自然与热带农业之间的全球经济权衡。
Global economic trade-offs between wild nature and tropical agriculture.
作者信息
Carrasco Luis R, Webb Edward L, Symes William S, Koh Lian P, Sodhi Navjot S
机构信息
Department of Biological Sciences, National University of Singapore, Republic of Singapore.
Environment Institute, School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia.
出版信息
PLoS Biol. 2017 Jul 21;15(7):e2001657. doi: 10.1371/journal.pbio.2001657. eCollection 2017 Jul.
Global demands for agricultural and forestry products provide economic incentives for deforestation across the tropics. Much of this deforestation occurs with a lack of information on the spatial distribution of benefits and costs of deforestation. To inform global sustainable land-use policies, we combine geographic information systems (GIS) with a meta-analysis of ecosystem services (ES) studies to perform a spatially explicit analysis of the trade-offs between agricultural benefits, carbon emissions, and losses of multiple ecosystem services because of tropical deforestation from 2000 to 2012. Even though the value of ecosystem services presents large inherent uncertainties, we find a pattern supporting the argument that the externalities of destroying tropical forests are greater than the current direct economic benefits derived from agriculture in all cases bar one: when yield and rent potentials of high-value crops could be realized in the future. Our analysis identifies the Atlantic Forest, areas around the Gulf of Guinea, and Thailand as areas where agricultural conversion appears economically efficient, indicating a major impediment to the long-term financial sustainability of Reducing Emissions from Deforestation and forest Degradation (REDD+) schemes in those countries. By contrast, Latin America, insular Southeast Asia, and Madagascar present areas with low agricultural rents (ARs) and high values in carbon stocks and ES, suggesting that they are economically viable conservation targets. Our study helps identify optimal areas for conservation and agriculture together with their associated uncertainties, which could enhance the efficiency and sustainability of pantropical land-use policies and help direct future research efforts.
全球对农林产品的需求为热带地区的森林砍伐提供了经济诱因。大部分此类森林砍伐发生时,人们对森林砍伐的收益和成本的空间分布缺乏了解。为了给全球可持续土地利用政策提供信息依据,我们将地理信息系统(GIS)与生态系统服务(ES)研究的荟萃分析相结合,对2000年至2012年热带森林砍伐造成的农业收益、碳排放和多种生态系统服务损失之间的权衡进行空间明确分析。尽管生态系统服务的价值存在很大的内在不确定性,但我们发现一种模式支持这样的观点:除了一种情况,即在未来能够实现高价值作物的产量和租金潜力时,在所有情况下,破坏热带森林的外部性都大于当前从农业获得的直接经济收益。我们的分析确定了大西洋森林、几内亚湾周边地区和泰国是农业转换在经济上似乎有效的地区,这表明这些国家的减少森林砍伐和森林退化所致排放量(REDD+)计划的长期财政可持续性存在重大障碍。相比之下,拉丁美洲、东南亚岛屿地区和马达加斯加呈现出农业租金(ARs)较低且碳储量和生态系统服务价值较高的地区,这表明它们是在经济上可行的保护目标。我们的研究有助于确定保护和农业的最佳区域及其相关的不确定性,这可以提高泛热带土地利用政策的效率和可持续性,并有助于指导未来的研究工作。