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Sensitivity of Canopy Phenology to Local Urban Environmental Characteristics in a Tropical City
Ecosystems ( IF 3.7 ) Pub Date : 2020-10-13 , DOI: 10.1007/s10021-020-00571-y
Peter Kabano , Angela Harris , Sarah Lindley

Canopy phenology is sensitive to variability in local environmental settings. In temperate climates, urban phenological processes and their determinants are relatively well understood. Equivalent understanding of processes in tropical urban settings is, however, less resolved. In this paper, we explore the influence of local urban environmental characteristics (that is, degree of urbanization, land cover and urban climate) on canopy phenology of two deciduous tree species (Jacaranda mimosifolia, n = 48, and Tabebuia rosea, n = 24) in a tropical city (Kampala, Uganda). Our study design involved ground monitoring and field sampling in 2017, with a focus on the dry season. We found that both species experienced significantly higher rates of canopy cover decline in heavily built-up neighborhoods (p < 0.05 for both species). Moreover, Jacaranda was more sensitive to differences in the degree of urbanization than Tabebuia, both in terms of total percentage tree canopy cover (p < 0.01) and net leaf loss (p < 0.05). Total percentage tree canopy cover for Jacaranda declined with increasing proportion of impervious cover (that is, roads and paved cover) and was positively related to relative humidity (p < 0.01), a variable correlated with soil moisture. Net leaf loss in Jacaranda increased with the decreasing proportion of pervious land cover and as nighttime air temperature increased (p < 0.01). In contrast, land cover and urban climate had no significant influence on either measure of phenological traits for Tabebuia. These results provide new evidence of the effect of urbanization on canopy phenology of different tree species in the tropics. Such knowledge offers new insights into the spatial and temporal differences in the physiological functional traits of trees and also serves as a proxy for possible species responses under future climate change.



中文翻译:

热带城市冠层物候对当地城市环境特征的敏感性

冠层物候对本地环境中的变化敏感。在温带气候下,人们对城市物候过程及其决定因素的理解相对较好。然而,对热带城市环境中的过程的同等理解却难以解决。在本文中,我们探讨了当地城市环境特征(即城市化程度,土地覆盖和城市气候)对两种落叶树种(Jacaranda mimosifolian  = 48和Tabebuia rosea,n)的树冠物候学的影响。 = 24)位于一个热带城市(乌干达坎帕拉)。我们的研究设计包括2017年的地面监测和田间采样,重点是旱季。我们发现,在物种密集的社区中,这两种物种的冠层覆盖率均显着提高( 两种物种的p <0.05)。此外,蓝花楹是在城市化比的程度的差异更敏感风铃木属,无论是在总百分比树篷盖(而言p  <0.01)和净叶损失(p  <0.05)。蓝花anda的树冠总覆盖率随着不透水覆盖物(即道路和铺路覆盖物)的比例增加而下降,并且与相对湿度呈正相关(p  <0.01),与土壤湿度相关的变量。蓝花car的净叶片流失量随透水覆盖率的降低和夜间气温的升高而增加(p  <0.01)。相比之下,土地覆盖和城市气候对Tabebuia的任一物候性状指标均无显着影响。这些结果为城市化对热带地区不同树种的树冠物候学影响提供了新的证据。这些知识为树木的生理功能特征的时空差异提供了新的见解,并为未来气候变化下可能的物种反应提供了代理。

更新日期:2020-10-13
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