多年生沙生植物如何响应和适应增温和降水变化是评估气候变化影响荒漠生态系统稳定性以及防沙治沙生态工程安全的关键。植物通过调整自身的物候和生物量分配是其响应和适应气候变化的重要策略。以往关于植物物候响应气候变化的研究只关注少数几个地上物候起始时间的变化，缺少对整个生活史地上和根系物候起始时间和持续期的同步研究，对植物响应和适应不同气候变化情境的资源分配过程和机理还缺乏认识。本项目将利用增温和降水变化梯度野外控制试验，结合定位观测、微根管技术和稳定性同位素示踪试验，通过对不同生活型沙生植物地上物候序列和根系物候的起始时间和持续期、不同器官的数量和形态特征及其生物量分配的研究，揭示沙生植物物候和生物量分配响应不同气候变化情景的生态学过程和机理，为预测和评估气候变化对温带荒漠沙生植被的影响提供基础数据和理论依据。

The response and adaption of perennial psammophytes to warming and precipitation change is the key to evaluate the effects of climatic change on desert ecosystem stability and the safety of desertification control and prevention ecological projects. Plants can adjust their phenology and biomass allocation to response and adapt to climatic change as an important strategy. However, most previous studies about how plant phenolgy respond to climatic change only focused on changes of the onset of several few phenological events, while synchronous studies about the onset and phenophase of both aboveground and root phenological events over the life history are in so much of a shortage. Moreover, it is unclear how psammophytes will adjust their resource allocation to respond and adapt to different climatic change scenarios. Based on a field warming and precipitation change gradients experiment, this study project will 1) monitor the onset and phenophase of different aboveground and root phenological events, 2) examine the dynamics of plant growing, the amounts and morphological characteristics of different plant organs and biomass allocation using traditional observation, minirhizotron and stable isotope trace technologies, with the final objectives to reveal the process and mechanism about how psammophytes will adjust their phenological events and biomass allocation to respond to climatic change. This study will provide fundamental data and theoretical evidences to evaluate and forecast the effects of different climatic change scenarios on psammophytic vegetation in the temperate desert .