关键词: 演替分析, 物种多样性, 黄土高原生态恢复, 退耕还林还草

Abstract

A research program on ultradry seed storage （supported by IBPGR） was carried out at the Beijing Botanical Garden from 1989-1993. Various kinds of seeds of more than 20 speices were used. Many significant rsults and findings were obtained, and some new concepts were derived from them. Based on a series of experiments, it was concluded that ultradry storage has the potential to be an alternative technique for germplasm conservation in gene banks. Advances of researches in detail were reported in this paper.

Key words: succession analysis, species diversity, ecological restoration of loess plateau, convert farmland to forest