共同体身份是个体与共同体之间的认同，建构了特定的社会文化、政治或心理特征。随着语言学范式的后现代转向，社会建构主义视角来探讨共同体身份的建构被广为采用。

社交媒体话语中的亲和关系具有周遍性，参与者不一定直接互动，而是基于共同的价值观进行交流。通过概念-态度耦合，周遍性亲和关系在参与者中形成异质的价值定位。 通过将概念意义和态度意义结合起来，周遍性参与者能够在上下文中建立和识别不一致之处，这种现象在社交化过程中被称为联结。人们利用亲和关系系统来实现社交互动， 通过概念-态度耦合而无需进行实时回应和非语言交流，从而最大限度地提升交际影响力。

本研究从周遍性亲和关系的角度探讨了在线书评中共同体身份的话语构建，自建好读网《寂静的春天》的 300 个在线书评语料库，采用定量和定性方法进行分析。首先，使用潜在狄利克雷分配主题模型揭示了四种共同体身份：基本信息提供者、环境破坏反思者、环境保护措施提出者和环境保护倡导者。其次，使用UAM Corpus Tool进行手动标注，分析了共同体身份通过基于概念-态度耦合和周遍性亲和关系的话语策略进行构建。

主要研究结果如下：首先，所有四种共同体关注化学品的不良影响。基本信息提供者关注该书的重要性，环境破坏反思者表达个人对环境破坏的感受，环境保护措施提出者提供保护环境的建议，环境保护倡导者通过描绘过去人类错误行为的后果来吸引读者。

其次，身份构建使用指称策略、预测策略、视角化策略和论证策略。指称策略在构建内部和外部群体起重要作用，通过概念和呼叫资源来实现，预测策略根据评价资源给社会行为者分配正面或负面特征，视角化策略关注书评者通过定位资源定位自己的观点，论证策略通过调节资源来支持正面和负面的归因。

本研究从周遍性亲和关系的角度探讨了共同体身份的话语构建。希望能够揭示周遍性亲和关系在在线书评中的作用方式，并促进生态写作中生态观念的传播。

Community identity is the identity between an individual and the community, which constructs specific socio-cultural, -political or -psychological characteristics. It reflects the belonging relationship between them. With the post-modern turn of paradigm in linguistics, the social constructionist view is taken by more to delve into the construction of community identity.

Affiliation in social media discourse is ambient in the sense that audiences do not necessarily directly interact but instead commune around values. Values are heteroglossically positioned with the ambient audience by means of the modulation of ideation-attitude couplings. The ambient audience establishes and recognizes inconsistencies in the context by combining attitudes and ideational meanings, referred to as “bonds” in socialization. The system of communion affiliation is utilized to account for social interaction on digital platforms, where individuals optimize their interpersonal impact by ideation-attitude couplings without repartee and paralanguage.

From the perspective of ambient affiliation, this study investigates the discursive construction of community identity in online book reviews. With a self-built corpus of 300 online reviews of Silent Spring on Goodreads, both quantitative and qualitative methods are adopted by the study. First, Latent Dirichlet Allocation topic modelling is applied to reveal four community identities including providers of basic information, reflectors of environmental disruption, proposers of environmental protection measures, and advocates of environmental protection. Second, the UAM Corpus Tool is used for manual annotation to analyze how community identities are constructed through ideation-attitude couplings and the communing affiliation system.

The major findings are as follows. First, reviews constructing all four communities focus on the adverse impact of chemicals. Reviews constructing providers of basic information are concerned with the significance of this book and reviews constructing reflectors of environmental disruption express personal feelings about environmental destruction. Reviews constructing proposers of environmental protection measures provide suggestions to protect the environment. Reviews constructing advocates of environmental protection appeal to readers by depicting the repercussions of past human misbehaviour.

Second, referential strategies, predicational strategies, perspectivation strategies and argumentation strategies are employed for identity construction. The use of referential strategies is instrumental in constructing both ingroups and outgroups, realized through ideations and convoking resources. Predicational strategies assign positive or negative traits to social actors based on appraisal resources, while perspectivation strategies focus on how reviewers position their opinions via finessing resources. Argumentation strategies are utilized to support positive and negative attributions through tempering resources.

This study explores the discursive construction of community identities from the perspective of ambient affiliation. It is hoped to shed light on the ways in which ambient affiliation operates in online book reviews and how it facilitates the dissemination of ecological ideas in ecological writing