Abstract Knowledge about the impacts of urban heat islands (UHI) and associated thermal gradients on vegetation seasonality (i.e. phenology) is vital for understanding spatial patterns in vegetation ecosystem functions. However, in contrast to temperate cites, there is little evidence to show how UHI influences landscape phenological processes in the tropics. In this study, we examined vegetation phenological responses to urban form, distance from the city centre and surface temperatures, in the tropical city of Kampala, Uganda. Estimates of vegetation growing season length and land surface temperature were derived from MODIS satellite imagery for multiple years (2013–2015) and urban form was characterised using the Local Climate Zone (LCZ) classification. We showed that growing season length increased along the urban–rural gradient (p

中文翻译：

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城市热岛对热带城市植被生长季长度影响的证据

摘要 关于城市热岛 (UHI) 和相关热梯度对植被季节性（即物候）影响的知识对于理解植被生态系统功能的空间模式至关重要。然而，与温带城市相比，几乎没有证据表明 UHI 如何影响热带的景观物候过程。在这项研究中，我们研究了乌干达热带城市坎帕拉的植被物候对城市形态、距市中心距离和地表温度的响应。植被生长季节长度和地表温度的估计值来自多年（2013-2015 年）的 MODIS 卫星图像，城市形态使用当地气候区 (LCZ) 分类进行表征。我们发现生长季长度沿城乡梯度增加（p