中文导读 香港大学团队综合1980至2025年间大量研究，估算绿地接触的“剂量”与心理健康收益的关系：每周一次、约一小时的接触即可达到观测到的最大收益的约一半。研究10月13日由港大介绍，发表于《Journal of Environmental Psychology》。
正文 An HKU-led research team has offered a clearer answer to a simple question : how much time in green spaces may help mental health ? The study was published in the Journal of Environmental Psychology and summarised by the university on October 13. As cities have grown denser rates of depression and anxiety have climbed for many people . Researchers wanted practical numbers that ordinary city residents could use , not only the general claim that nature is good for us .
本段译文 香港大学牵头的研究团队，对一个简单问题给出了更清楚的回答：在绿地里待多久，可能有助于心理健康？该研究发表于《Journal of Environmental Psychology》，并由港大于10月13日作了介绍。随着城市变得更密，许多人报告抑郁与焦虑比例上升。研究者希望得到普通市民也能使用的实用数字，而不只是“亲近自然有益”这一笼统说法。
Professor Bin Jiang of HKU’s Faculty of Architecture led the work with colleagues including Peng Gong , Chris Webster , and Gunter Schumann . First author Jiali Li is a PhD student at HKU . Together they reviewed a huge body of research from 1980 to 2025. From 92,430 studies they distilled 78 dose-response curves and 756 data points on mental health outcomes such as mood stress depression , and anxiety . The main analysis focused on visit frequency and duration
本段译文 港大建筑学院蒋斌（Bin Jiang）教授主持这项工作，合作者包括龚鹏（Peng Gong）、克里斯·韦伯斯特（Chris Webster）与冈特·舒曼（Gunter Schumann）等。第一作者李佳丽（Jiali Li）是港大博士生。他们共同回顾了1980至2025年的大量研究。在92,430项研究中，提炼出78条剂量—反应曲线和756个数据点，覆盖情绪、压力、抑郁与焦虑等心理健康结果。主要分析关注人们造访绿地的频率与时长。
The mental health benefits followed an S-shaped curve Gains rose quickly at low doses , then levelled off . The team proposed three Estimated Dose Benchmarks . One visit and about one hour each week reached roughly 50 percent of the maximum observed benefit . Four visits and four hours a week reached about 90 percent . Six visits and about eight hours a week reached about 99 percent , close to the plateau of the curve
本段译文 心理健康收益呈S形曲线：在较低剂量时上升很快，随后趋于平缓。团队提出了三个“估计剂量基准”。每周造访一次、合计约一小时，可达到观测到的最大收益的约50%。每周四次、合计约四小时，约达90%。每周六次、合计约八小时，约达99%，接近曲线平台。
That pattern has a practical message for busy urban residents . The largest gains may come from the first small steps , such as walking through a park on the way to work or school . At higher doses returns become smaller . Policymakers and designers therefore need not chase extreme targets Modest , well - distributed access to green space may already deliver much of the measured benefit for public mental health planning
本段译文 这一模式对忙碌的城市居民有实际意义。最大的收益可能来自最初的小步骤，例如上班或上学路上穿过公园。剂量更高时，边际回报变小。因此，政策制定者与规划设计者不必追求极端目标。适度、分布良好的绿地可达性，或许已能带来公共心理健康规划中相当一部分已测收益。
The authors also set clear limits . The benchmarks are population averages , not personal prescriptions . Effects can vary with age , climate , the quality of the green space , and a person’s baseline mental health Evidence on very high doses remains thin , and a third question in their broader Dose of Nature project — how far people must travel to reach greenery — still needs more data . Still , with urbanisation expected to place more people in cities by 2050, the study gives planners , clinicians , and ordinary readers usable targets : nature helps , and a little weekly contact can go a long way .
本段译文 作者也标明了明确边界。这些基准是人群平均结果，不是个人处方。效应会随年龄、气候、绿地质量以及个人基线心理健康状况而变化。关于极高剂量的证据仍然薄弱；其更广泛的“自然剂量”项目中的第三个问题——人们需要走多远才能到达绿化——仍需更多数据。不过，随着城市化预计在2050年前让更多人住进城市，这项研究为规划者、临床工作者与普通读者提供了可用目标：自然有帮助，而每周一点点接触也可能走得很远。
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