摘要
通过近几年对塔里木河下游3个典型断面的胡杨各项生态指标的实地监测,分析了输水恢复过程中胡杨生长对地下水位的响应程度。研究表明:(1)河岸胡杨林生长与地下水埋深有密切的关系,通过10次生态输水,下游河道沿岸的地下水得到补充,水位明显抬升,胡杨长势也随着地下水位的抬升有不同程度的好转。(2)地下水位愈深,胡杨的干旱胁迫程度愈强。横向上,胡杨对生态输水的响应随着河道距离的增加逐渐减弱;纵向上,从上段至下段胡杨生长对输水的响应范围逐渐减小。(3)在输水河道两侧过水湿润岸滩,虽有胡杨实生苗零星出现,但就目前输水方式,还无法实现胡杨大面积繁殖更新。
The positive response of Populus euphratica to the change of groundwater level was analyzed by monitoring different ecological parameters of P.euphratica on the three typical transects along the lower reaches of Tarim River.The results show that the growth of P.euphratica riparian forests correlated closely with the groundwater depth.The groundwater has been recharged and risen significantly after ten times of water diversion,and also the vitality of P.euphratica improved to different extent as the result of groundwater-recharging.P.euphratica drought-stress intensified with the rising of groundwater depth.As a result,the response of P.euphratica to ecological water diversion decreased gradually away from the river channel,and along the river,this response reduced gradually from the upper section to the lower section.Although P.euphratica seedlings have appeared sporadically in the wet area near the two sides of riverbank,the present water-recharging scheme is difficult to realize the reproduction and renewal of P.euphratica in large areas.
出处
《水土保持通报》
CSCD
北大核心
2011年第5期18-22,共5页
Bulletin of Soil and Water Conservation
基金
新疆维吾尔自治区自然科学基金项目"塔里木河下游生态输水过程中荒漠河岸林恢复监测"(2010211A05)
德国Robert-Bosch基金会项目"Vegetation and soil response to water diversion on the lower Tarim River
Xinjiang/China"(32.5.8003.0063.0)
关键词
胡杨
地下水水位
应急输水
塔里木河下游
Populus euphratica
groundwater level
emergency water diversion
lower reaches of the Tarim River
