Live fences and landscape connectivity in a neotropical agricultural landscape
Live fences and landscape connectivity in a neotropical agricultural landscape
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DOI：
10.1007/s10457-005-5831-5
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发表时间：
2006-09-01
影响因子：
2.2
通讯作者：
Harvey, Celia A.
中科院分区：
文献类型：
--
作者：
Leon, Mario Chacon;Harvey, Celia A.
活栅栏是新热带农业景观中常见的组成部分，通过增强景观的连通性，在生物多样性保护中发挥重要作用，但其数量和空间分布却知之甚少。本研究的目的是描述丰富和空间格局的活栅栏在一个破碎的景观为主的牧场在里约弗里奥，哥斯达黎加，以确定其贡献的景观结构和连接，并检查其作为工具的景观保护规划的作用。活栅栏占景观中所有栅栏的45.4%，平均密度为每公顷50.5延米。虽然活栅栏只覆盖了景观的一小部分总面积（< 2%），但它们对景观结构和连通性产生了重要影响，增加了树木总覆盖率，将牧场划分为较小的区域，创造了跨越景观的直线网络，并提供了与森林斑块的直接物理连接。模拟结果显示，将所有现有的木栅栏改为活栅栏将大大加强景观的连通性，使与森林生境直接连接的面积、密度和数量增加一倍以上，并减少树冠之间的平均距离。我们的研究表明，活栅栏发挥关键作用，在DE。这是新热带农业景观结构和组成的一个重要方面，值得在保护工作和旨在加强景观连通性和促进生物多样性保护的农业政策中加以考虑。活栅栏是新热带农业景观中常见的组成部分，通过增强景观的连通性，在生物多样性保护中发挥重要作用，但其数量和空间分布却知之甚少。本研究的目的是描述丰富和空间格局的活栅栏在一个破碎的景观为主的牧场在里约弗里奥，哥斯达黎加，以确定其贡献的景观结构和连接，并检查其作为工具的景观保护规划的作用。活栅栏占景观中所有栅栏的45.4%，平均密度为每公顷50.5延米。虽然活栅栏只覆盖了景观的一小部分总面积（< 2%），但它们对景观结构和连通性产生了重要影响，增加了树木总覆盖率，将牧场划分为较小的区域，创造了跨越景观的直线网络，并提供了与森林斑块的直接物理连接。模拟结果显示，将所有现有的木栅栏改为活栅栏将大大加强景观的连通性，使与森林生境直接连接的面积、密度和数量增加一倍以上，并减少树冠之间的平均距离。我们的研究表明，活栅栏在确定新热带农业景观的结构和组成方面发挥着关键作用，值得在保护工作和农业政策中加以考虑，以提高景观连通性和促进生物多样性保护。
Live fences are common elements in neotropical agricultural landscapes and could play important roles in the conservation of biodiversity by enhancing landscape connectivity, however, little is known about their abundance and spatial arrangement. The objectives of this study were to characterize the abundance and spatial patterns of live fences in a fragmented landscape dominated by pastures in Rio Frio, Costa Rica, to determine their contribution to landscape structure and connectivity and to examine their role as tools for landscape conservation planning. Live fences accounted for 45.4% of all fences in the landscape and occurred with a mean density of 50.5 linear meters per hectare. Although live fences covered only a small total area of the landscape (< 2%), they had an important effect on landscape structure and connectivity, increasing total tree cover, dividing pastures into smaller areas, creating rectilinear networks that cross the landscape and providing direct physical connections to forest patches. Simulations showed that the conversion of all existing wooden fences to live fences would greatly enhance landscape connectivity by more than doubling the area, density and number of direct connections to forest habitats, and reducing the average distance between tree canopies. Our study demonstrates that live fences play key roles in de. ning the structure and composition of neotropical agricultural landscapes and merit consideration in both conservation efforts and agricultural policies designed to enhance landscape connectivity and promote biodiversity conservation. Live fences are common elements in neotropical agricultural landscapes and could play important roles in the conservation of biodiversity by enhancing landscape connectivity, however, little is known about their abundance and spatial arrangement. The objectives of this study were to characterize the abundance and spatial patterns of live fences in a fragmented landscape dominated by pastures in Rio Frio, Costa Rica, to determine their contribution to landscape structure and connectivity and to examine their role as tools for landscape conservation planning. Live fences accounted for 45.4% of all fences in the landscape and occurred with a mean density of 50.5 linear meters per hectare. Although live fences covered only a small total area of the landscape (< 2%), they had an important effect on landscape structure and connectivity, increasing total tree cover, dividing pastures into smaller areas, creating rectilinear networks that cross the landscape and providing direct physical connections to forest patches. Simulations showed that the conversion of all existing wooden fences to live fences would greatly enhance landscape connectivity by more than doubling the area, density and number of direct connections to forest habitats, and reducing the average distance between tree canopies. Our study demonstrates that live fences play key roles in defining the structure and composition of neotropical agricultural landscapes and merit consideration in both conservation efforts and agricultural policies designed to enhance landscape connectivity and promote biodiversity conservation.