塔里木河下游应急输水与生态改善监测评估

Monitoring and assessment of emergent water transportation and ecological improvement in the lower reaches of the Tarim River

通过对塔里木河下游5次应急输水各断面地表水水量、12个地下水监测断面观测数据和33个植被样地实测资料的统计分析,找寻应急输水地下水恢复与植被响应之间的关系。研究结果表明,塔里木河下游5次应急输水对该区域地下水恢复起到了积极的作用,沿河道横向1000m范围内地下水埋深平均抬升了4 0m,植被响应范围扩大到离河900m;沿河道纵向,阿拉干以上河段地下水埋深得到初步恢复,植被生长量有明显变化。阿拉干以下河段地下水水位受应急输水影响较弱,特别是依干不及麻断面以下地下水水位基本未得到恢复。

Through analyzing water quantity of surface water cross-sections, field data of 12 groundwater monitoring sections and 33 vegetation sample plots during the 5 times of emergent water conveyance in the lower Tarim River, the relationship between groundwater restoration and vegetation response is to be found out. It shows that the 5 emergent water transportations play an active part in the restoration of the groundwater. The groundwater level raises 4.0m averagely in a distance of 1?000?m across the river, and the distance of vegetation response extends to 900?m. Along the river, the groundwater level upstream of the Alagan section is preliminarily rehabilitated, and the growth of vegetation changes obviously. The groundwater level upstream is slightly affected by the emergent water transportation, and the groundwater level downstream of the Yilabujima section is hardly rehabilitated.