胡杨枝直径生长对塔里木河下游应急输水的响应

胡杨枝年轮信息包含了塔里木河水量变化内容,通过胡杨枝生长量调查可以反映塔里木河应急输水规律.塔里木河应急输水后,受输水影响不同离河距离胡杨枝连年直径生长量出现突出增长,产生明显影响的开始时间大多起于2001年,有些枝直径增长量是输水前3.85倍.输水后与输水前胡杨枝直径生长量的比值与离河距离之间存在显著负相关.通过输水前后胡杨枝直径的变化关系可以推断出各输水断面胡杨对输水的响应范围,在2003年分布最远已经达到的离河900m.

Increment in Branch Diameter of Populus Euphratica in Response to Emergent water Transportation to Downstream Tarim River, China

The ring growth of the branches of Populus euphratica Oliv. reflected the changes in water flow of the Tarim River. We can thus find information about the emergent water transportation to the Tarim River through the investigation of the increment of the branch of P. euphratica. After the emergent water transportation the growth of P. euphratica branches in diameter increased significantly, mostly since the year 2001, in some cases up to 3.85 times the growth before the water transportation project was carried out. The ratio of the branch diameter after and before water transportation was negatively correlated to the distance between the tree and the river. The pattern of the change in branch diameter increment indicates that the extent of the influence of the emergent water transportation reached 900 m from the river in 2003.