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收稿日期:2001-6-6。
基金项目:山东省人民政府可持续发展科技示范工程“山区生态资源保护及综合开发利用技术的研究与示范”项目资助
作者简介:张连忠,男,(1954- ),副教授,长期从事果树栽培、果树栽培生理的教学和研究工作.