文献类型：期刊文献

中文题名：城市林荫环境下紫外辐射的人体健康曝露时长测算

英文题名：Estimating human healthy exposure duration of ultraviolet radiation in urban tree shading environment

作者：孙睿霖[1] 王成[1] 韩文静[1] 边琦[1] 张淑菁[1]

第一作者：孙睿霖

机构：[1]中国林业科学研究院林业研究所,国家林业和草原局城市森林研究中心,北京100091

年份：2025

卷号：47

期号：7

起止页码：21-29

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划(2021YFE0193200)。

语种：中文

中文关键词：林下光环境;紫外辐射;红斑效应;维生素D缺乏;人体健康;郁闭度;城市森林

外文关键词：light environment under canopy;UV radiation;erythemal effect;vitamin D deficiency;human health;canopy closure;urban forest

分类号：S731

摘要：【目的】量化人体在林荫环境中通过日光紫外辐射安全合成维生素D(避免红斑效应危害)的最佳曝露时长,解析其关键影响因素,为健康导向的城市户外空间设计及居民户外活动时间规划提供科学依据。【方法】选取北京市11种典型城市乔木,实测四季、5个时段(08:00、10:00、12:00、14:00和16:00)的林荫下紫外辐射强度,并基于我国居民皮肤最小红斑剂量和维生素D最低合成剂量(10μg),计算人体曝露时长,对林荫紫外辐射与各林分结构特征进行相关性分析,筛选关键影响因子,最后采用多元线性回归模型构建林荫健康曝露时间估算模型。【结果】(1)林荫环境可使曝露时长增至林外的2~13倍,夏季延时效果最为明显,达林外的8倍以上;(2)林分郁闭度和叶面积指数是生长季影响林内红斑紫外辐射量,进而决定紫外线曝露时长的主要林分结构指标,郁闭度为0.4时,林内健康曝露时长约为林外的1.8倍,此后郁闭度每提高0.2,可延长约50%时间;(3)利用实测数据,建立了以日光紫外线指数和林分郁闭度估算林荫健康曝露时长模型(R^(2)=0.47)。【结论】林荫环境能够营造相对温和的紫外辐射环境,满足国人适度曝露于紫外线辐射的健康需求。通过合理规划城市林荫环境,可实现对日光紫外辐射健康效益与风险的协同调控,显著延长居民户外活动时间。
[Objective]This paper quantifies the optimal exposure duration for human body to synthesize recommended dose of vitamin D through sunlight ultraviolet(UV)radiation without inducing erythema in tree shade,and analyzes key influencing factors,so as to provide scientific basis for health-oriented urban open space design and residents’outdoor activity scheduling.[Method]Eleven typical urban tree species in Beijing were selected to measure UV radiation intensity under tree shade across 4 seasons and 5 time periods(08:00,10:00,12:00,14:00 and 16:00).Optimal exposure durations were calculated based on the minimum erythema dose(MED)for Chinese skin types and the minimum vitamin D synthesis dose(10μg).Correlation analysis was performed between UV radiation and forest structural characteristics to explore key influencing factors.A multiple linear regression model was used to establish an exposure duration estimation model.[Result](1)The optimal time for exposure in forest could be 2-13 times longer than that in the open.Summer had the most striking time extension effect,with the duration extendable by more than 8 times.(2)Canopy cover and leaf area index(LAI)were the main structural indicators affecting erythemal UV radiation(UVer)in the forest,thereby determining the duration of UV exposure during growing seasons.At a canopy cover of 0.4,exposure duration doubled compared with open areas;each 0.2 increase in canopy cover extended the duration by 50%.(3)A model(R^(2)=0.47)was developed to estimate the optimal exposure time in tree shade with the use of UV index(UVI)and canopy cover using experimental data.[Conclusion]Urban tree canopies create a mild UV radiation environment which tends to meet the health needs of Chinese people for moderate exposure to UV radiation.By wisely creating shaded environments with trees,it is possible to achieve a synergistic regulation of UV radiation health benefits and risks,and prolong residents’outdoor activity time significantly.