The luxury of vegetation and the legacy of tree biodiversity in Los Angeles, CA
The luxury of vegetation and the legacy of tree biodiversity in Los Angeles, CA
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DOI：
10.1016/j.landurbplan.2013.04.006
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发表时间：
2013-08-01
影响因子：
9.1
通讯作者：
Davila, Antonio
中科院分区：
文献类型：
--
作者：
Clarke, Lorraine Weller;Jenerette, G. Darrel;Davila, Antonio
城市植被覆盖和生物多样性为城市居民提供生态系统服务，尽管对不同城市土地利用中影响管理植被覆盖和生物多样性的机制还没有很好的了解。为了评估影响城市植被覆盖和树木生物多样性的竞争机制，我们收集了来自加利福尼亚州洛杉矶市350个地块的数据。阿尔法（阿尔法）和贝塔（贝塔）树的生物多样性进行了量化使用基于样本的稀疏曲线。独立的气候，土地利用，奢侈和遗产效应的假设进行了评估与残差回归分析和最佳模型选择使用AIC。住宅用地在所有采样尺度上的α生物多样性最高，但β多样性最低，可能表明管理人员的植物库有限。增加家庭收入中位数独立相关的每一种类型的植被覆盖，支持奢侈的效果。解释覆盖率变化最大的回归模型还包括人口密度。相反，树种丰富度只与房龄呈正相关，支持遗产效应。收入中位数对树木生物多样性没有独立的影响，这与其他干旱城市的模式形成对比。然而，年龄和收入具有交互作用。最高的阿尔法树和贝塔树多样性被发现在古老的高收入地区。管理植被提供的生态系统服务应优先考虑低收入社区，以增加覆盖率，而管理生物多样性应保持旧社区的现有多样性，并鼓励新社区的新物种。(C)2013爱思唯尔有限公司版权所有。
Urban vegetation cover and biodiversity provide ecosystem services to city residents, though the mechanisms affecting managed vegetation cover and biodiversity across varying urban land uses are not well understood. To evaluate competing mechanisms influencing urban vegetation cover and tree biodiversity, we collected data from 350 plots in the City of Los Angeles, CA. Alpha (alpha) and beta (beta) tree biodiversity were quantified using sample based rarefaction curves. Hypotheses of independent climate, land use, luxury and legacy effects were evaluated with residual regression analysis and best models were chosen using AIC. Residential land use had the highest alpha biodiversity at all sampling scales, but the lowest beta diversity, possibly indicating a limited plant pool for managers. Increased median household income was independently related to each type of vegetation cover, supporting a luxury effect. Regression models explaining the most variation in cover also included population density. In contrast, tree species richness was only positively related to housing age, supporting the legacy effect. Median income had no independent effect on tree biodiversity, which contrasts with patterns in other arid cities. However, age and income had an interactive effect. The highest alpha and beta tree diversity were found in old, high-income locations. Managing for ecosystem services provided by vegetation should prioritize low income neighborhoods for increasing cover, while managing for biodiversity should maintain existing diversity in older neighborhoods and encourage new species in newer neighborhoods. (C) 2013 Elsevier B.V. All rights reserved.