胡杨树干液流的时空变异性研究  

Spatial and Temporal Characteristics of Stem Sap Flow of Populus euphratica

作　　者：张小由[1] 龚家栋[1] 周茅先[1] 司建华[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《中国沙漠》2004年第4期489-492,共4页Journal of Desert Research

基　　金：中国科学院知识创新工程项目(KZCX1 10 03);国家重点基础研究规划发展项目(G199904230601);中国科学院知识创新工程方向性项目(KZCX3 SW 329)资助

摘　　要：应用热脉冲式液流测定系统(HPVR)、TDR和ICT自动气象站,对黑河下游额济纳绿洲的胡杨的液流变化及其与环境因子关系进行了1a的观测。结果表明,胡杨液流的日变化具有单峰的特征;在经向的不同位点上液流具有相同的变化趋势,流速随深度增加流速增大,在15mm为最大;在方位上,流速以南面(南、西)远远高于北面(北、东);在水分不足的条件下,树干液流有很大的波动特征;气象因子与树干液流之间的数量关系能较好地预测树干的蒸腾耗水量。The sap flow rate of Populus euphratica and its relationship with environmental factors has been observed for one year in Ejin oasis at lower Heihe river by using HPVR, TDR and ICT systems. The result showed the following regularities: the diurnal variation of sap flow rate of Populus euphratica appears single-peak; there is little sap flow rate in morning and night; there is the same variation trend at different points; the velocity increases with the depth increase, and there is the maximum at 15 mm depth; but the velocity decreases when the depth exceeds 15 mm. In the direction, the velocity in south and west is higher than in north and east. Due to water intimidation, sap flow rate has the character of fluctuation. With the relationship of sap flow rate with weather factor, the amount of evapotranspiration can be predicted.

关 键 词：胡杨 液流 时空变异性 热脉冲 

分 类 号：Q945.172[生物学—植物学]