摘要
结合塔里木河下游英苏与阿拉干两个断面距河道 5 0m、10 0m与 2 0 0m处胡杨茎水势的测定资料 ,对胡杨茎水势进行均值比较与检验分析 ,结果表明 :胡杨茎水势变化既与地下水位有关 ,表现为在一定范围的地下水位条件下 ,胡杨茎水势变化随着地下水位的降低而升高 ;同时也与气候因子有联系 ,表现为在两个断面相应距离处的胡杨茎水势方差都没有显著差异。胡杨自身具有较强的抗旱性与适应性 ,能够在较深地下水位状态下 ,通过生理调节维持自身的水分需要而生存。
Combining with the mensurated materials about stems water potential of Populus euphratica being located about 50m?100m and 200m from riverway at Yingsu and Alagan sections at lower reaches of Tarim River ,this paper made an analysis about the distribution,average and variance for stems water potential of populus euphratica . Let us know that stems water potential of populus euphratica at Yingsu and that at Alagan are mutual independent and they submit to normal school. Otherwise,the changes of stems water potential of populus euphratica is related to groundwater level. To a certain extension,the lower groundwater level is,the higer stems water potential of populus euphratica is. Moreover,groundwater level at Yingsu is higher than that at Alagan,but stems water potential of Populus euphratica at Yingsu is less than that at Alagan. Furthermore,stems water potential of populus euphratica about 50m,100m and 200m from riverway at Yingsu or Alagan firstly minishes and increases subsequently. After intermittently transporting water five times,groundwater level at Yingsu and Alagan both reach about 4m in the range of about 200m away from riverway. Groundwater level primarily affects stems water potential of Populus euphratica in this range,however,outside about 200m from riverway stems water potential of Populus euphratica was mainly influenced by climate factor. In the extremely arid climate,the rising of plant weakens and most of lamina's pores close so as to reduce the loss of moisture.Concequently,When climate factor has a higher impact on stems water potential of Populus euphratica about 200m from riverway at Yinigsu than groundwater level,stems water potential is less than that of the other two distances. In the mean time, Populus euphratica has a strong quality of fighting a drought and adjustability. In the deeper groundwater level, Populus euphratica can regulate physiology and mantain the requirements to water in order to survive.
出处
《干旱区地理》
CSCD
北大核心
2004年第2期207-211,共5页
Arid Land Geography
基金
国家自然科学基金重点项目 (90 10 2 0 0 2 )
中国科学院知识创新重大项目 (KZCX1-0 8-0 3 )资助
关键词
地下水位
茎水势
塔里木河下游
新疆
胡杨
Populus euphratica
stems water potential
groundwater level
lower reaches of Tarim River.
