民勤绿洲边缘植被恢复与重建初探  

A Study on the Rehabilitation of Vegetation Around Minqin Oasis

作　　者：常兆丰[1] 汪杰[1] 王耀琳[1] 李昌龙[1] 

机构地区：[1]甘肃省治沙研究所,武威733000

出　　处：《干旱区资源与环境》2006年第2期171-175,共5页Journal of Arid Land Resources and Environment

基　　金：国家"十五"重点攻关项目:内陆河下游绿洲型防沙治沙综合技术体系研究(2002BA517A-09);甘肃省重点科技攻关项目:绿洲边缘退化植被恢复;重建技术研究与示范资助

摘　　要：干旱缺水是导致民勤绿洲边缘植被退化的根本原因,也是民勤绿洲边缘退化植被恢复与重建的关键限制因子。恢复存在着一个过去时间的参照系,要恢复民勤绿洲边缘植被到过去某一时期的状态是不可能的;提取地下水灌溉恢复退化植被只能加速植被的进一步退化;采用滴灌灌溉目前还不具备条件;集流降水也于事无补;而目前尚无抗逆性更强的植物种用以取代退化植被。目前只能做到:⑴实施封育保护,使其进入退化→自然稀疏→沙丘活化→储存降水→自然演替的过程,使其形成在现有水资源条件下的植物群落或植被;⑵破坏土壤表面结皮,储存有限降水提高沙丘水分;⑶充分利用农田边缘和渠道渗漏剩余水;⑷农业节水是根本。Water shortage, a fundamental cause leading to the degradation of vegetation around the Minqin oasis, is a pivotal factor to the rehabilitation of vegetation around the Minqin oasis. There is a frame of reference on time background to the rehabilitation, it is almost impossible to restore the vegetation to a state of certain times in the past, Pumping groundwater to restore the vegetation will contribute to further worsening of vegetation. The application of drip irrigation is beyond the reach of farmers in this area. It can hardly expect to rain collect. Moreover there is no more adversity-resistant plant species to replace the current ones. At present what can be done includes （1） closing off to form a vegetation or flora under the existing moisture condition through the process of degradation - natural thinning-dune activation-storing rainfall-natural evolvement; （2） break the crust of soil to improve the moisture in dunes; （3） making use of percolating water from canals and the fringe of farmland; （4） water saving in agriculture being an essential way.

关 键 词：沙漠 绿洲边缘 植被 恢复 重建 民勤 

分 类 号：X171.4[环境科学与工程—环境科学]