There is evidence that institutions related to climate change and natural resource influence each other's performance, and that local settings also affect policy outcomes. We examine how policy implementation processes and institutional interactions shape the Reducing Emissions from Deforestation and Forest Degradation (REDD+) programme in Cameroon. While institutional and governance features of REDD+ have been extensively studied, research on REDD+ implementation has primarily focused on resource tenure, benefit-sharing and participation. Less attention has been given to how implementation typology determines the highly influential factors for REDD+ outcomes, and how preexisting forest institutions affect REDD+. We apply a policy implementation framework and a theory for institutional interaction to examine how REDD+ implementation typologies, and interactions with forestry regulations influence the outcomes of three REDD+ pilot projects in South and West Cameroon. Drawing from four focus group discussions with project beneficiaries and thirteen interviews with local stakeholders and land-users, we find that REDD+ projects epitomise political implementation in the South and experimental implementation in the West. We also indicate how project outcomes have been affected by rules regarding community forests, reforestation and timber processing. Our findings suggest that cultural understanding and local knowledge as well policy designers' ability to satisfy community preferences is important for projects'outcomes in the South, while resource availability and social capital are pivotal in the West. Incentives to promote local timber processing, rethink and expedite the decentralisation of forest governance would improve REDD+ project implementation in Cameroon.

有证据表明，与气候变化和自然资源相关的制度会影响彼此的绩效，当地环境也会影响政策结果。我们研究了政策实施过程和机构互动如何影响喀麦隆的减少森林砍伐和森林退化所致排放量 (REDD+) 计划。虽然 REDD+ 的制度和治理特征已得到广泛研究，但对 REDD+ 实施的研究主要集中在资源保有权、利益共享和参与方面。较少关注实施类型如何确定对 REDD+ 结果的高度影响因素，以及先前存在的森林机构如何影响 REDD+。我们应用政策实施框架和制度互动理论来研究 REDD+ 实施类型，与林业法规的相互作用影响了喀麦隆南部和西部的三个 REDD+ 试点项目的结果。通过与项目受益者的四次焦点小组讨论以及与当地利益相关者和土地使用者的十三次访谈，我们发现 REDD+ 项目是南方政治实施和西方实验性实施的缩影。我们还指出了有关社区森林、重新造林和木材加工的规则如何影响项目结果。我们的研究结果表明，文化理解和当地知识以及政策设计者满足社区偏好的能力对南方的项目结果很重要，而资源可用性和社会资本在西方则至关重要。鼓励当地木材加工，