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首页> 外文期刊>Agricultural and Forest Meteorology >Testing an energy exchange and microclimate cooling hypothesis for the effect of vegetation configuration on urban heat
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Testing an energy exchange and microclimate cooling hypothesis for the effect of vegetation configuration on urban heat

机译：测试能源交换和微气候冷却假设，以实现植被配置对城市热的影响

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While an effect of urban vegetation configuration on land surface temperature (LST) has been identified worldwide, the mechanism underlying configuration-LST relationships remains unclear as most urban LST data only resolve to neighborhood scales. Here we ask: does urban vegetation provide more cooling arranged in fewer and larger patches or more numerous but smaller patches in the Phoenix metropolitan area, Arizona, USA? We hypothesized the combination of energy exchanges between adjacent patches and microclimate cooling induced by vegetation are key processes determining how configuration affects LST. Using high resolution thermal data (7 m), we evaluated predictions from this hypothesis through a multiple scale analysis spanning from within individual patches to among neighborhoods. We found tree cover is the dominant factor influencing urban cooling and that tree and grass configurations also substantially affect cooling, with effects generally exceeding 40% that of tree cover. The effects of tree and grass cover and configuration on LST were scale-dependent and reflect differences from within individual patches to among neighborhoods. In general, greater edge density and shape complexities of vegetation patches cool the landscape but may warm individual vegetation patches. Conversely, increasing individual vegetation patch size and reducing shape complexity may lead to cooler vegetation patches but a hotter landscape. Our findings suggest more edge area strengthens energy exchanges between vegetation and surroundings and more vegetation core area lead to greater cooling within individual patches. Through applications of high resolution thermal remote sensing, we are able to more directly connect effects of land cover composition and configuration to LST distributions that can help cities plan and evaluate local climate adaptation strategies.
机译：虽然在全球范围内发现了城市植被配置对陆地温度（LST）的影响，但基础-LST关系的机制仍不清楚，因为大多数城市LST数据只能解决邻里尺度。在这里，我们问：城市植被提供更多的冷却，在亚利桑那州凤凰城大都会地区，美国凤凰城大都市区内或更小的斑块排列我们假设相邻斑块与植被引起的微气候冷却之间的能量交换的组合是确定配置如何影响LST的关键过程。使用高分辨率热数据（7米），我们通过从各个贴片内的多种规模分析到邻域中的多种规模分析评估了这一假设的预测。我们发现树木封面是影响城市冷却的主要因素，树木和草配置也大大影响冷却，效果通常超过树木覆盖的40％。树木和草覆盖和配置在LST上的影响是依赖尺度的，并反映了各个补丁中的差异到邻里。通常，植被斑块的更大的边缘密度和形状复杂性冷却景观，但可能是温暖的个体植被斑块。相反，增加个体植被贴片尺寸和减小形状复杂度可能导致较冷的植被斑块，但景观更热。我们的研究结果表明更多的边缘区域加强植被和周围环境之间的能量交换，并且更多的植被核心区域导致各个贴片内的更大冷却。通过高分辨率热遥感的应用，我们能够更直接地将陆地覆盖成分和配置的影响与LST分布相连，可以帮助城市计划和评估当地的气候适应策略。

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