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本文介绍了半干旱地区干草原地带天然灌木半灌木树种优若黎（Ｅｕｒｏｔｉａｃｅ－ｒａｔｏｉｄｅｓＬ．）和小叶绵鸡儿（ＣａｒａｇａｎａｍｉｃｒｏｐｈｙｌｌａＬ．）生长季的蒸腾速率、叶片扩散阻力、环境因子及叶水势的日进程，并按照土壤－植物－大气连续体理论，估算了土壤、植物、大气水势梯度。
This paper presents the daily process of transpiration rate, leaf diffusion resistance, environmental factors and leaf water potential during the growing season of natural shrubs and semi-shrubs Eurotiace-ratoides L. and Caraganamicrophylla L. in the semi-arid region. According to the theory of soil-plant-atmosphere continuum, the gradient of soil-plant-water potential is estimated.