中文摘要：

在干旱、半干旱的区域的水赤字影响整个植物的树液流动和叶级的水关系。这研究的目的是澄清 Calligonum arborescens 的树液流动怎么对不同干旱压力条件作出回应并且理解它的环境适应机制到干旱环境。一个地实验为 C 被进行。arborescens 在成长季节期间抛弃高速公路沿着 Tarim 在防风林在箱子树液流动的每日、季节的变化上评估赤字灌溉的效果， Xinjiang，中国。三不同的水政体(2,380， 1,960 和 1,225 m3/hm2 ) 在植物生长的不同阶段被使用。从 5 月 1 日到 2007 年 10 月 30 日，一个热平衡茎流动计量器被用来监视 C 的树液流动动力学。在不同的水政体下面的 arborescens。为差别的大气的蒸发需求和土壤潮湿条件灌溉了 C。arborescens 也被监视。结果显示出展出的那树液流动一清楚日报模式不管处理；日报树液流动和蒸汽压力赤字的模式在不同的水政体和成长季节下面是很类似的，当这关联的线性回归的斜坡证实了增加时，流水政体。树液流动在减少的水政体下面减少了，不管水政体有夜的树液流动，它主要被贡献夜的蒸发和水再装。树液流动在午夜前达到顶点并且比在另外的季节在夏天与显然更高的价值以后落下。它被推测 C 的水消费。arborescens 能在夜里通过树液流动在日子期间被补充，它与增加灌溉数量增加了。网放射是在不同的水政体下面影响了树液流动速度和蒸发的最重要的相关因素(R 2 > 0.719 ) 。与通常练习的水政体相比， C 的生长。arborescens 在压力赤字灌溉是显著地更慢的，然而并非与那显著地不同在中等赤字灌溉。中等赤字灌溉不影响防风林的稳定性并且与当前的流水数量相比是水资源的更有效的使用。

英文摘要：

Water deficit in arid and semiarid regions affects whole-plant sap flow and leaf-level water relations. The objectives of this study were to clarify how sap flow of Calligonum arborescens responds to different drought stress conditions and to understand its acclimation mechanism to drought environments. A field experiment was conducted for C. arborescens during the growing season to evaluate the effects of deficit irrigation on the daily and seasonal variations of trunk sap flow in the shelterbelt along the Tarim Desert Highway, Xinjiang, China. Three dif- ferent water regimes （2,380, 1,960 and 1,225 m3/hm2） were applied at different stages of plant growth. From 1 May to 30 October 2007, a heat-balance stem flow gauge was used to monitor the sap flow dynamics of C. arborescens under different water regimes. Atmospheric evaporation demand and soil moisture conditions for differentially irri- gated C. arborescens were also monitored. The result showed that sap flow exhibited a clear diurnal pattern re- gardless of treatments; the diurnal patterns of sap flow and vapour pressure deficit were very similar under different water regimes and growing seasons, while the slope of the linear regression of this correlation confirmed an in- creasing water regime. The sap flow decreased under reduced water regimes and there was nocturnal sap flow regardless of water regimes, which was mainly contributed to nocturnal transpiration and water recharge. The sap flow peaked before midnight and dropped afterwards with obviously higher values in summer than in other seasons. It is speculated that the water consumption of C. arborescens during the day can be supplemented through the sap flow at night, which increased with increasing irrigation amount. Net radiation was the most significant correlated factor that influenced sap flow velocity and transpiration under different water regimes （R2〉0.719）. Compared with the commonly practiced water regime, the growth of C. arborescens was significantly slower in the stress deficit