城市绿地提供了丰富的生态系统服务，是居民锻炼身体、接触自然、社会交往的重要场所。绿地类型多样，包括公园、风景林地、社区花园、校园绿地等。其中，校园绿地指高校内部的绿色空间，是大学生日常学习生活环境的重要组成部分，对学生的身心健康具有重要的作用。大学校园的绿地面积有限，人口相对密集。深入理解校园绿地为学生提供的生态系统服务，以及学生对于绿地的需求，有助于充分发挥绿地的作用，更好地服务于学生。为此，本研究以北京师范大学为例，从学生的角度出发，分析校园绿地生态系统服务的供求。具体选取遮荫降温、观赏、休闲三个正向生态系统服务和致敏的负向服务进行评估。同时通过问卷调查了解学生的绿地满意度和需求。主要结论如下：

（1）校园内绿地共18处，总面积9.27公顷，每年提供的服务价值分别为遮荫降温217万元，观赏服务76万元、休闲服务77万元。（2）校园绿地共有乔木14种、1235棵，其中致敏树木9种、980棵，占树木总量的79%。其中悬铃木的致敏性最高，共143棵，占15%。（3）学生的绿地需求以休闲和观赏服务为主，分别占79%和70%。学生对于校园绿地满意度整体较高，71%的受访者表示对校园绿地“非常满意”。他们对于常去绿地满意度较整体满意度略高。

结果表明，校园绿地提供的服务类型能够匹配学生的主要需求。在清洁管理和绿地配套设施方面，仍有较大的改善空间。建议：

（1）通过增加座椅等设施，使绿地更便于停留和开展多种活动；（2）完善学十六北广场绿化，增加植被以供观赏。（3）在管理方面，保持校园绿地长椅无污渍、地面整洁无乌鸦排泄物，修剪乔木以控制花粉传播等。

Urban green space can provide rich ecosystem services for residents, which is important for residents to exercise, contact nature and socialize. There are various types of green space, including parks, scenic woodland, community gardens, campus green space, etc. Among them, campus green space is green space inside the university, but also an important part of students' learning and living environment, especially important for students' physical and mental health. Some campuses are limited in area and densely populated. Deeply understanding the ecosystem services provided by campus green space and the needs of students for green space is helpful to give full play to the role of green space and better serve students. Therefore, this study takes Beijing Normal University as an example to analyze the supply and demand of campus green space ecosystem services from the perspective of students. Three positive ecosystem services, shade and cooling, viewing and leisure, and negative sensitization services were selected for evaluation. At the same time, this study surveys students' needs and satisfaction through questionnaires. The main conclusions are as follows:

(1) There are 18 green spaces in the campus, with a total area of 9.27 hectares. The annual service value provided is 2.17 million yuan for shade and cooling, 760,000 yuan for viewing and 770,000 yuan for leisure. (2) There are 1,235 trees of 14 kinds in the campus green space, among which 980 trees of 9 kinds are allergenic, accounting for 79% of the total trees. Among them, Chinese parasol (sycamore) had the highest sensitization with 143 trees, accounting for 15%. (3) Students' demand for green space is mainly leisure and viewing services, accounting for 79% and 70% respectively. Students' satisfaction with campus green space is generally high, with 71% respondents saying they are "very satisfied" with campus green space. They are slightly more satisfied with frequent visits to green spaces than the overall satisfaction.

The results show that the types of services provided by campus green space can match the main needs of students. In terms of clean management and green facilities, there is still much room for improvement. Suggestions:

(1) Make the green space more convenient to stay and carry out a variety of activities by adding seats and other facilities; (2) Improve the greening of the square on the north side of Student 16 apartment and increase vegetation for viewing. (3) In terms of management, keep the bench stain-free and ground clean and free of crow excrement, trim trees to control pollen spread.