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首页> 外文期刊>Urban ecosystems >Rainfall interception by six urban trees in San Juan, Puerto Rico
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Rainfall interception by six urban trees in San Juan, Puerto Rico

机译：波多黎各圣胡安的六棵城市树木拦截降雨

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Rainfall interception is an important part of the urban hydrological cycle. Understanding is limited about the role of urban trees and other vegetation in the interception process. This study quantified interception losses by six trees in the Caribbean coastal city of San Juan, Puerto Rico, three representing a broadleaf evergreen, and three representing a broadleaf deciduous species. Rainfall was partitioned into throughfall for 13 storms to compare the results between tree types. Total rainfall ranged from 2.9 to 72.4mm, and storm duration spanned 1h to several days. Six of the storms analyzed were characterized by maximum hourly intensity rainfall rates categorized as heavy ( 7.6mm/h). Strong northeasterly winds brought rain in sustained gusts up to 35km/h. Average interception losses totaled 19.7% for both tree types, 22.7% for the deciduous trees, and 16.7% for the evergreen trees. Throughfall exceeded 90% of total rainfall for each of the six trees on one or more occasions, and heavy intensity storms produced negative interception losses in one individual. The effect of tree type on interception was significant for storms of low and moderate intensity, but not heavy intensity. Differences in interception losses between storms of similar intensity and between the two tree types were influenced by leaf area and wind. Results suggest that individual urban tree canopies function as spatio-temporally dynamic storage reservoirs whose interception capacity can vary as micro-meteorological conditions change. These findings help advance understanding about interception processes in humid tropical urban settings.
机译：降雨拦截是城市水文循环的重要组成部分。关于城市树木和其他植被在拦截过程中的作用的了解有限。这项研究量化了波多黎各加勒比沿海城市圣胡安的六棵树的拦截损失，其中三棵代表常绿阔叶树，三棵代表阔叶落叶树。降雨被分为13次暴风雨的穿透降雨，以比较树木类型之间的结果。总降雨量在2.9至72.4毫米之间，风暴持续时间长达1小时至数天。所分析的六场风暴的最大小时强度降雨率被分类为强（> 7.6mm / h）。强烈的东北风带来阵雨，持续阵风高达每小时35公里。两种树的平均拦截损失总计为19.7％，落叶树为22.7％，常绿树为16.7％。六次或以上六次中，每棵树的穿透量都超过了总降雨量的90％，而强风暴对一个人造成了负面的拦截损失。对于低强度和中等强度的风暴，树木类型对拦截的影响是显着的，但是对于强强度的风暴却没有。相似强度的风暴之间以及两种树木之间的拦截损失差异受叶面积和风的影响。结果表明，单个城市树冠层起着时空动态储层的作用，其拦截能力会随着微气象条件的变化而变化。这些发现有助于进一步了解潮湿的热带城市环境中的拦截过程。

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