节水农业文献数据库主题检索系统的建立

主题标引是建立“节水农业文献数据库”主题检索系统的关键工作。它以《汉语主题词表》及相关专业词表为基础，依据节水农业文献的专题综合性、地域性和服务性的特点，优选词表内的主题词，并增补专指性较高的主题词，共计 ３１０６个主题词。又按既定的一套主题标引规范，实施科学标引，以便提高本文献数据库的检全率和检准率，满足用户主题检索的需要，利于节水农业文献资源的开发利用。

A study on development and utilization of water-saving agriculture literature resources

Subject indexing is the key step in creating subject retrieval system of watersaving agriculture literature database. On the basis of Chinese thesaurus and related specialty thesaurus, and according to the special topic characteristic of comprehension, locally and service, some subject words were selected from thesaurus, and added others with higher indication into italtogether 3106 words was scientific indexing also put into effect according to a fixed subject indexing regulation so as to increase the recall ration and accuracy ratio of the literature in the database, satisfy the user's needs to search subjects, benefit the development and utilization of water-saving agriculture literature resources.