Abstract: Selenium is a vital trace element.The selenium content of foods is lower than the need of maintenance,growth and reproduction for human being.It is an important approach to search for natural food being rich in selenium.68 wild vegetables with high or low selenium content were presented in this paper.The results showed that the average content of them is 00853?mg kg-1 in dry sample,which is lower than that in cultivated vegetables.Among them,8 species were separated into high selenium content,34 species into the lower and 26 species into the lowest.

Key words: Wild vegetable

摘要： 以香格里拉县的吉沙村为研究点，基于社区调查、关键人物访谈和可持续生计分析，对当地的林业、农业及畜牧业用地使用变化作了调查研究，并对变化的驱动因素做了分析。研究结果认为国家资源利用政策和市场经济是促使当地土地利用发生变化的最根本原因。但是当地社区对土地利用变化的反应和村民的生计策略往往受到宗教、文化、家庭的经济条件、劳动力等影响。

关键词: 土地利用变化, 驱动因子, 藏族社区, 香格里拉县