Surrounding habitats mediate the trade-off between land-sharing and land-sparing agriculture in the tropics
Surrounding habitats mediate the trade-off between land-sharing and land-sparing agriculture in the tropics
复制标题
DOI：
10.1111/1365-2664.12284
复制
发表时间：
2014-10-01
影响因子：
5.7
通讯作者：
Edwards, David P.
中科院分区：
文献类型：
--
作者：
Gilroy, James J.;Edwards, Felicity A.;Edwards, David P.
1. 为了减轻农业扩张对生物多样性的影响，经常提倡两种策略：一种是在农田内整合野生动物友好栖息地（土地共享），另一种是加强农业生产，以抵消自然保护区（土地节约）。它们在生物多样性保护方面的相对优点一直受到很多争论，但之前没有研究调查过这两种策略之间的权衡是否取决于农业地区与大片自然栖息地的接近程度。我们在一个受威胁的地方性热点地区——哥伦比亚可可-安第斯山脉——的连续森林和农业景观（低强度养牛场）中对鸟类和蜣螂进行了采样。我们检验了这一假设，即两种策略的相对生物多样性效益部分取决于农田与大片连续森林隔离的程度。我们发现，距离森林的距离调节了农田内许多物种的发生。对大多数物种而言，在农田的发生取决于与森林的隔离程度和农场景观内小规模野生动物友好栖息地的比例覆盖，这两个变量对发生概率的总体影响程度相似。模拟结果表明，随着与森林距离的增加，土地共享的生物多样性效益显著下降，但土地节约效益保持一致。位于大型连片森林附近的农场管理单位(
1. Two strategies are often promoted to mitigate the effects of agricultural expansion on biodiversity: one integrates wildlife-friendly habitats within farmland (land sharing), and the other intensifies farming to allow the offset of natural reserves (land sparing). Their relative merits for biodiversity protection have been subject to much debate, but no previous study has examined whether trade-offs between the two strategies depend on the proximity of farmed areas to large tracts of natural habitat.2. We sampled birds and dung beetles across contiguous forests and agricultural landscapes (low-intensity cattle farming) in a threatened hotspot of endemism: the Colombian Choco-Andes. We test the hypothesis that the relative biodiversity benefits of either strategy depend partially on the degree to which farmlands are isolated from large contiguous blocks of forest.3. We show that distance from forest mediates the occurrence of many species within farmland. For the majority of species, occurrence on farmland depends on both isolation from forest and the proportionate cover of small-scale wildlife-friendly habitats within the farm landscape, with both variables having a similar overall magnitude of effect on occurrence probabilities.4. Simulations suggest that the biodiversity benefits of land sharing decline significantly with increasing distance from forest, but land sparing benefits remain consistent. In farm management units situated close to large contiguous forest (