数字农科院2.0

China's fight to halt tree cover loss

文献类型： 外文期刊

作者： Ahrends, Antje;Chen, Huafang;Zomer, Robert J.;Wang, Mingcheng;Xu, Jianchu;Ahrends, Antje;Hollingsworth, Peter M.;Beckschaefer, Philip;Chen, Huafang;Zomer, Robert J.;Wang, Mingcheng;Xu, Jianchu;Zhang, Lubiao

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关键词： China;afforestation;deforestation;tree cover;biodiversity

期刊名称： PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

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收录情况： SCI

摘要： China is investing immense resources for planting trees, totalling more than US$ 100 billion in the past decade alone. Every year, China reports more afforestation than the rest of the world combined. Here, we show that China's forest cover gains are highly definition-dependent. If the definition of 'forest' follows FAO criteria (including immature and temporarily unstocked areas), China has gained 434 000 km(2) between 2000 and 2010. However, remotely detectable gains of vegetation that non-specialists would view as forest (tree cover higher than 5 m and minimum 50% crown cover) are an order of magnitude less (33 000 km(2)). Using high-resolution maps and environmental modelling, we estimate that approximately 50% of the world's forest with minimum 50% crown cover has been lost in the past approximately 10 000 years. China historically lost 1.9-2.7 million km(2) (59-67%), and substantial losses continue. At the same time, most of China's afforestation investment targets environments that our model classes as unsuitable for trees. Here, gains detectable via satellite imagery are limited. Conversely, the regions where modest gains are detected are environmentally suitable but have received little afforestation investment due to conflicting land-use demands for agriculture and urbanization. This highlights the need for refined forest monitoring, and greater consideration of environmental suitability in afforestation programmes.

分类号： Q

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