被子植物广泛分布于旱生生境中，其是否与裸子植物类似，具有分化的气孔调控类型，形成不同的气孔行为和水分利用策略，从而适应旱生生境中不同的降水分配模式，有待揭示。我国内蒙古和新疆北部多为旱生生境，内蒙古降水集中于夏秋，分配不均，植物频遭干旱胁迫；新疆北部降水季节分配基本均匀，春季融雪充分保障植物需水，夏秋植物持遇干旱胁迫。本项目拟以两地分布的被子植物为研究对象，以干旱胁迫和复水为研究手段，揭示被子植物适应内蒙古和新疆北部降水分配模式的气孔调控类型，基于气孔调控类型形成的气孔行为和水分利用策略。旨在深入认识被子植物适应两类降水分配模式的水分利用策略分异基础，完善进化过程中维管束植物抗旱性形成的理论体系。

Angiosperm species widely spread in arid areas in the world. However, whether angiosperm species, as gymnosperm species, have different stomatal regulation and behavior to adapt to different precipitation allocation patterns still need to be looked at in concert. Inner Mongolia have low precipitation (less than 350 mm in most areas), but with more than 70 % of the total annual precipitation occurring during the May–October growing season. Xinjiang Province have an annual precipitation of less than 250 mm, but similar precipitation throughout the year, and the accumulation of thick snow in winter results in high soil water availability in spring after the snow melts. However, this is followed by severe summer and autumn drought. This project will use angiosperm species from arid areas of Inner Mongolian Autonomous Region and north Xinjiang Province as materials to investigate whether an increase in ABA or a decrease in leaf water potential regulate stomatal closure under drought stress, to separate the interacting effects of ABA and water tension on stomatal closure to reveal the types of stomatal regulation, and to investigate the water use strategies of angiosperms species in the Inner Mongolian Autonomous Region and Xinjiang Province. The project proposal will not only aid in revealing stomatal behavior differentiation of angiosperm species, but also providing a deep insight into water use strategies of angiosperm species to adapt to different precipitation allocation pattern in the Inner Mongolian Autonomous Region and north Xinjiang Province.