【摘要】 利用Dynamax茎流测量系统、JA2103N千分之一天平和自动气象站对毛乌素沙地优生灌木树种柠条锦鸡儿的液流变化、蒸腾速率及其周围的环境因子进行观测。结果表明:①柠条锦鸡儿茎干液流速率日变化趋势呈多峰曲线;液流启动时间为7:00,9:00左右达液流峰值,峰值大小168~450 g/h,20:00左右降为最低,晚间有明显的液流活动现象。②柠条锦鸡儿的茎干液流日变化曲线与叶片蒸腾速率日变化曲线并不吻合,实验测得的叶片蒸腾速率不能同步反映茎干液流的动态变化特征。③柠条锦鸡儿白天液流速率变化趋势与环境因子变化趋势相吻合。相关性分析表明,影响灌木液流变化的主因子依次是太阳有效辐射、土壤含水量、空气温度和相对湿度。更多还原

【Abstract】 In this study,the sap flow and transpiration rate of Caragana korshinskii,a well-growing shrub species,and their affecting environmental factors in the Mu Us Sandland in Ningxia Hui Autonomous Region,China,were tested and observed by using the Dynamax sap flow testing system,JA2103N millesimal balance and automatic meteorological station.The results are as follows:(1) The daily variation curve of sap flow velocity in Caragana korshinskii stem is in a multimodal distribution;the sap flow starts at 7:00,it is up to the highest around 9:00 and drops to the lowest around 20:00,its value varies in a range of 168~450 g/h,and the sap flow also flows at night;(2) Diurnal variation curve of sap flow does not accord with that of transpiration rate of Caragana korshinskii leaves,and the dynamic change of transpiration rate of Caragana korshinskii leaves can not be revealed by the measured values of sap flow;(3) The daily trend of sap flow velocity accords with that of environmental factors.The correlation analysis reveals that the main factors affecting the variation of sap flow in shrubs are the effective solar radiation,soil moisture content,air temperature and air relative humidity.更多还原