中文摘要：

基于旅游者环境友好行为的“利他主义”和“集体行动”属性，文章探讨了关系社会资本、集体社会资本、广义社会资本与旅游者环境友好行为意愿之间的理论关系．并以杭州西溪湿地为例，依据371位游客的抽样调查数据，实证检验了三个层面社会资本的核心要素（情感连带、群体规范、人际信任）对旅游者两层次环境友好行为意愿的影响。研究结果显示：（1）情感连带、群体规范对旅游者环境维护行为意愿、环境促进行为意愿均具有显著的正向影响；（2）人际信任对环境维护行为意愿具有显著的正向影响，对环境促进行为意愿的影响则不显著；（3）不同层面社会资本对环境友好行为意愿的影响强度具有差异性，集体社会资本下的群体规范对环境维护行为意愿的影响最强，而关系社会资本下的情感连带对环境促进行为意愿的影响最强。

英文摘要：

Sustainable tourists have attracted considerable attention from both scholars and practitioners in tourism. Unlike traditional tourists whose behaviors need to be ＂regulated＂ and ＂restrained＂, sustainable tourists spontaneously behave environmental-friendly during their visits, and even take proactive actions to contribute to destination＇ s environmental protection. Some scholars indicated that a relationship of ＂people-park symbiosis＂ exists between this kind of tourists and destinations. Tourists, thus, can be regarded as a form of ＂asset＂, rather than traditionally criticized ＂liability＂, for destination＇ s environmental protection. Fostering environment-friendly behavior of tourists was considered as the ＂best practice＂ in destination management for sustainable tourism. Therefore, investigating the driving forces of tourists＇ EFB has become a critical issue in sustainable tourism research. While considerable research has been directed toward the factors that may shape tourists＇ intention to exhibit EFB, most of them focused on individual-level variables. In the paper, we argue that tourists＇ EFB has the attributes of ＂altruism＂ and ＂collective action＂, thus a mere individual-level perspective could not provide an overall understanding of such behavior. Relational factors such as in- group norm, tourists＇ emotional tie with destinations and trust may also play significant roles in forming such behavior. Although previous research has directly or indirectly mentioned the altruistic and collective-action attributes of EFB and its relational facets, they scattered across different disciplines and were mostly not theory-based. To address this limitation, this paper applied the theoretical framework of social capital to integrate these scattered viewpoints, and further the discussion of tourists＇ EFB from a perspective of social interactions. Using the framework provided by Brounie, a theoretical model was developed to exam the influence of three variants of social ca