Abstract: The climate change caused by global warming brings a huge challenge to the sustainable development of human society. Extensive university campuses are not only public building clusters that require urgent carbon reduction but also places for scientific research and social activities. They will set an example in research and action on carbon reduction. Currently, most existing studies focus on the calculation of carbon emission components on campuses as well as the analysis of influencing factors. However, it lacks a discussion on the distribution laws of carbon sink characteristics in campuses from a spatial perspective. Existing studies have limited guidance to low-carbon planning and design of campuses. In this study, the Wushan Campus, University City Campus, and International Campus of South China University of Technology (SCUT) were chosen as typical cases. The characteristics and spatial distribution patterns of carbon sequestration benefits in university campuses were discussed through field surveys. The three chosen campuses were compared to understand the influence of different campus types on numerical value, distribution characteristics and internal structure of carbon sequestration benefits in carbon sink spaces. 1) The carbon sequestration efficiency of green spaces in the Wushan Campus of SCUT was found to be at a relatively high level among global university campuses while being influenced by the mild and humid climate in subtropical regions. The carbon sequestration efficiency of green spaces in University City Campus and International Campus was also at a medium to high level. 2) The carbon sequestration capacity of campus green spaces was found to be lower than that of natural ecological green spaces and park green spaces, but higher than that of general urban green spaces. For old campuses, the role of campus green spaces in carbon storage can be fully developed in cities. For the newly built International Campus of SCUT, a field survey revealed that the planting density of greenery was relatively low due to appreciation and use functions of Greenland in the campus, thus resulting in a low carbon sequestration benefit level. 3) In campus planning and design, different forms of campus planning space layout can be combined with campus landscape design to create carbon sink space with a high carbon sequestration efficiency. (4) The carbon sinking and carbon sequestration benefits of green spaces on campus are mainly related to the vegetation community type and corresponding area of campus green spaces. Due to the tight land use on campus, the possibility of significantly increasing or reconstructing green space areas is very small. New green spaces should be added in accordance to campus landscape design. It could be achieved by making full use of the fifth facade of buildings, campus scraps and other open spaces, adding strip and scattered green spaces appropriately, establishing a three-dimensional and networked green space framework, and increasing the total amount of campus carbon sequestration effectively. The calculation of building carbon sequestration space in this study mainly focuses on campus environmental research due to the limitation in research conditions and research duration as well as the problem of incomplete data. Therefore, the influence of seasons on carbon sequestration efficiency should be considered in future studies on carbon sequestration efficiency of campus carbon sink spaces. The carbon sequestration efficiency of carbon sinks is influenced by size of the carbon sink space. Highly dense carbon sink spaces have higher carbon sequestration efficiency. In addition, the concept of urban green space with modern significance originates from the urban open space in Western countries. It corresponds to the Chinese term "urban green spaces". The coordinated development of green space and urban spatial structure is crucial. The combination of green space and urban spatial structure is a key concern in the field of green buildings and ecological cities at present. In this study, only qualitative research on the coupling relationship between the distribution pattern of carbon sink space and green space layout on the campuses of SCUT was carried out. The concept of physics coupling analysis which is commonly used in current urban research can be introduced in future to make a quantitative analysis of carbon sequestration benefits, green space ratio and green capacity ratio of carbon sink space. It could quantitatively disclose the coupling relationship between the distribution laws of carbon sink space and green spay layout on campus, and provide quantitative data supports to the influencing mechanism of planning schemes on vegetation coverage level and types. Hence, the influences of surrounding environmental greening on carbon sequestration efficiency of campus carbon sink space shall be taken into account in future studies. The combined coordination model also can be introduced for a quantitative analysis of the coupling relationship between campus greening and carbon sink space. Moreover, influences of basic differences in campus climate, vegetation types, and area size on the spatial distribution of campus carbon sinks shall be considered. Research conclusions are expected to provide decision-making references for carbon reduction design in university campus planning.

Key words: campus planning, South China University of Technology(SCUT), carbon sink, carbon sequestration benefits, space distribution

摘要： 全球变暖引起的气候变化对人类社会的可持续发展提出了巨大挑战，量大面广的大学校园既是亟需减碳的公共建筑组团类型又是科研和社会活动的场所，应该在碳减排的研究和行动方面做出表率。研究采用样地实测调查法，以华南理工大学三个校区为例，探讨大学校园绿地碳汇固碳效益特征及空间分布规律。研究结果表明：（1）受到亚热带地区温和湿润气候的影响，华南理工大学五山校区校园绿地碳汇固碳效益能力在全球大学校园中处于较高水平，华南理工大学大学城校区和华南理工大学国际校区的校园绿地碳汇固碳效益能力也处于中上水平；（2）校园绿地碳汇能力要低于自然生态绿地和公园绿地，但是高于一般城市绿地。对于历史年代悠久的老旧校园，在城市中可以充分发挥碳库的作用，对于新建的华南理工大学国际校区而言，基于实地调研发现，校园绿地的观赏与使用功能使得绿化的种植密度处于较低水平，这导致了华南理工大学国际校区较低的固碳效益水平；（3）在校园规划设计中，不同校园规划空间布局形式可以结合校园景观设计，打造高固碳效益的碳汇空间；（4）校园绿地碳汇固碳效益主要与校园绿地的植被群落类型及相应的面积相关，由于校园用地紧张，大量增加或改造校园绿地面积的可能性很小，新增绿地应该结合校园景观设计，充分利用建筑第五立面、校园边角料等空地，适当增加带状、分散式的绿地，建立立体、网络化的绿地骨架，有效提升校园碳汇总量。

关键词: 校园规划, 华南理工大学, 碳汇, 固碳效益, 空间分布