梭梭是干旱半干旱沙区主要的防风固沙优良树种，具有重要的生态价值和经济价值。梭梭的大面积栽植提高了沙区生态系统的防风固沙效应，同时增加了沙漠水资源的消耗，二者之间存在矛盾。因此，梭梭的水分利用与防风固沙效应的权衡机制及其对人为干扰的响应研究尤为迫切。本项目以乌兰布和沙漠东北部荒漠绿洲过渡带成熟龄人工梭梭为研究对象，对梭梭进行不同平茬处理。通过野外观测和稳定同位素技术，分析不同平茬处理后梭梭的水分利用来源、水分利用效率及蒸腾耗水特征，阐明梭梭水分利用变化；通过野外调查和风洞模拟实验，明确不同平茬处理后梭梭形态特征变化规律及防风固沙效应变化机理；基于以上研究，揭示梭梭水分利用与防风固沙效应的权衡机制，优选出水分需求最小、防风固沙效应最高的人为干扰方式。研究结果可为干旱半干旱沙区人工梭梭的优化管理提供理论基础和技术支撑，对沙区人工植被的可持续发展具有重要的理论和现实意义。

Haloxylon ammodendron is the main excellent tree species for windbreak and sand fixation in arid and semi-arid sandy area, which has important ecological and economic value. The large-scale cultivation of Haloxylon ammodendron has improved the windbreak and sand fixation effect of ecosystem in the sandy area, while the consumption of desert water resources has been also increasing, there is a contradiction between them. Therefore, it is particularly urgent to study the trade-off mechanism between water use and windbreak and sand fixation effect of Haloxylon ammodendron and its response to human disturbance. In this project, we will focus on the mature artificial Haloxylon ammodendron shrub in the desert-oasis transition zone of the northeast of Ulan Buh Desert, stumping the shrub with different patterns. By field observation and stable isotope technology, the change of water use will be clarified by analyzing the source of water use, water use efficiency and water consumption characteristics of transpiration of Haloxylon ammodendron in different stumping patterns. By field investigation and wind tunnel simulation experiments, the variation of morphological characteristics and the variation mechanism of windbreak and sand fixation effect of Haloxylon ammodendron in different stumping patterns will be clarified. Based on these researches, the trade-off mechanism between the water use and the effect of wind and sand fixation of Haloxylon ammodendron shrub will be revealed, and the human disturbance of minimal water requirement and highest windbreak and sand fixation effect will be optimized. This study will provide the theoretical basis and technical support for the optimal management of the artificial Haloxylon ammodendron and have important theoretical and practical significance for the sustainable development of artificial vegetation in arid and semi-arid sandy areas.