Hammack School of Business, Oglethorpe University, 4484 Peachtree Rd NE, Atlanta, GA, 30319, USA.
Department of Agricultural, Environmental and Development Economics, The Ohio State University, 2120 Fyffe Road, Columbus, OH, 43210, USA.
J Environ Manage. 2020 Sep 15;270:110813. doi: 10.1016/j.jenvman.2020.110813. Epub 2020 Jun 5.
We develop a spatial-dynamic model of resource management in the presence of externalities, such as the spread of harmful invasive species, and show that ecological capacity constraints influence optimal management strategies across space. We use integer-programming methods to solve for optimal control strategies in both homogeneous and heterogeneous landscapes. Using the spread of gypsy moths as an application, our results show that optimal levels of control vary over space in landscapes with heterogeneous capacity constraints. Optimal outcomes depend on the marginal costs and damages associated with the externality and the emergence of spread externalities from relative differences in population levels between adjacent patches. In models with high degrees of heterogeneity, we show that a naïve policy assuming homogeneous carrying capacity results in a significantly higher welfare losses from the externality.
我们建立了一个存在外部性（如有害入侵物种传播）的资源管理空间动态模型，并表明生态容量约束会影响跨空间的最优管理策略。我们使用整数规划方法来解决同质和异质景观中的最优控制策略。以舞毒蛾的传播为例，我们的结果表明，在具有异质容量约束的景观中，控制水平在空间上是变化的。最优结果取决于与外部性相关的边际成本和损害，以及相邻斑块之间种群水平差异引起的传播外部性的出现。在高度异质的模型中，我们表明，假设同质承载能力的简单政策会导致外部性造成的福利损失显著增加。
