Department of Economics and Resource Management, Norwegian University of Life Sciences, N-1432 Ås, Norway.
Proc Natl Acad Sci U S A. 2010 Nov 16;107(46):19639-44. doi: 10.1073/pnas.0912014107. Epub 2010 Jul 19.
Policies to effectively reduce deforestation are discussed within a land rent (von Thünen) framework. The first set of policies attempts to reduce the rent of extensive agriculture, either by neglecting extension, marketing, and infrastructure, generating alternative income opportunities, stimulating intensive agricultural production or by reforming land tenure. The second set aims to increase either extractive or protective forest rent and--more importantly--create institutions (community forest management) or markets (payment for environmental services) that enable land users to capture a larger share of the protective forest rent. The third set aims to limit forest conversion directly by establishing protected areas. Many of these policy options present local win-lose scenarios between forest conservation and agricultural production. Local yield increases tend to stimulate agricultural encroachment, contrary to the logic of the global food equation that suggests yield increases take pressure off forests. At national and global scales, however, policy makers are presented with a more pleasant scenario. Agricultural production in developing countries has increased by 3.3-3.4% annually over the last 2 decades, whereas gross deforestation has increased agricultural area by only 0.3%, suggesting a minor role of forest conversion in overall agricultural production. A spatial delinking of remaining forests and intensive production areas should also help reconcile conservation and production goals in the future.
在土地租金(von Thünen)框架内讨论了有效减少森林砍伐的政策。第一组政策旨在通过忽视推广、营销和基础设施、创造替代收入机会、刺激密集型农业生产或改革土地保有权来降低粗放农业的租金。第二组政策旨在提高采伐或保护森林租金,更重要的是,建立机构(社区森林管理)或市场(环境服务付费),使土地使用者能够获得更大份额的保护森林租金。第三组政策旨在通过建立保护区直接限制森林转换。这些政策选择中的许多都带来了森林保护和农业生产之间的地方输赢局面。当地产量的增加往往会刺激农业的侵占,这与全球粮食方程式的逻辑相悖,该逻辑表明,产量的增加会减轻森林的压力。然而,在国家和全球范围内,政策制定者面临着一个更为乐观的局面。过去 20 年来,发展中国家的农业生产每年增长 3.3-3.4%,而森林砍伐仅增加了 0.3%的农业面积,这表明森林转换在总体农业生产中作用不大。将剩余森林和密集生产区在空间上脱钩也有助于在未来协调保护和生产目标。