[Purpose/Significance]Hierarchical relationship reveals the inclusion between the concepts,The concept in different depths can describe topics with different range.It is an import research direction that how to determine the depth of hierarchical relationship and what kind of the law the level of hierarchical relationship follows.[Method/Process]The paper references the property of energy transformation in ecology and assumes that the hierarchical structure in thesaurus follow the rules of energy transfer in ecology.Finally, the result demonstrated the hypothesis that the hierarchical relationship accord with the energy transformation via counting the depth of hierarchical relationship in Chinese Thesaurus.[Result/Conclusion]The property of hierarchical relationship obeys the rule of energy transformation that "decreasing by one stage and flowing in one direction" and the depth of hierarchical relationship should remain in 3-5.The ecology property of hierarchical relationship provides a new way in constructing thesaurus.%[目的/意义]等级关系揭示了概念间的包含关系,不同深度的概念能够描述范围大小不同的主题,如何确定等级关系的层次深度,等级关系的层次遵循何种规律,成为知识组织系统的重要研究方向.[方法/过程]论文借鉴生态系统的能量流动规律,假设词族的等级结构符合生态系统能量流动的特点,并通过调研《汉语主题词表(工程技术卷)》的词族深度,发现词族等级关系深度与生态系统的营养级层次吻合,验证了等级关系生态属性的合理性.[结果/结论]等级关系遵循能量逐级递减的特性,且词族深度符合营养级3-5层的特征,等级关系的生态属性为叙词表等级关系的构建提供了新的思路.
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