生態學取向的宗教溝通的重要性不限於生態學論域本身。從宗教學的觀察角度來看，宗教系統的生態學溝通也是當代宗教現象，對相關現象的研究可以啟發有關宗教的理論性思維。本文應用盧曼系統理論的途徑來探討宗教系統生態學溝通「宗教性」的問題。就此途徑的功能論觀察角度而言，關鍵在於確定生態學溝通相關語意形式在宗教溝通系統封閉的運作網絡中所發揮的主要與次要功能。就各種宗教具體生態學溝通的例子而言，必須分析相關語意與宗教系統的「符碼」和個別宗教傳統「綱領」（教理、規範等）的關係。本文首先說明系統運作的兩種基本面向或層面：系統基本運作與語意。其次，闡明「功能」概念在宗教生態學溝通方面的涵義。最後，針對宗教生態學溝通的具體例子，指出系統理論途徑有助於分別宗教系統的生態學相關溝通所發揮的不同功能與作用。

The significance of eco-religious communication is not limited to the ecological and bioethical discourse. Within the context of the Science of Religion (Religious Studies), contributions by religious groups and individuals to the discussion of environmental issues as well as religious activities related to environmental concerns are treated as phenomena of contemporary religion that invite theoretical reflection and empirical research. This paper discusses the problem of determining the ＂religiousness＂ of eco-religious communication from the perspective of a Luhmannian systems theoretical approach to the study of religion. The paper explains the relevant concepts and premises of this approach, which will focus on the relation of eco-religious communication to the immanence/transcendence code of the religious system and the specific programs (teachings, regulations etc.) of particular religious traditions. According to the functionalist perspective of this approach, the religiousness of eco-religious communication is determined by its primary function within the self-referential network of communications. The paper first introduces the two dimensions of systems operation: basic operation and semantics. Next, the use of the concept ＂function＂ in the context of eco-religious communication will be explained. The fourth section briefly illustrates how the systems theoretical approach enables us to discern different functions and contributions of eco-religious communication in various contexts.