腰坝绿洲地下水位动态特征及对植被变化影响

地下水资源是干旱半干旱地区绿洲主要的供水水源,随着绿洲发展规模的不断扩大,为了满足日益增长的供水需求,加大了对地下水资源的开采导致了地质环境生态问题。本文结合实地调查、访问与统测方法,收集相关资料,测定地下水位,分析地下水位动态年内与年际变化特征,认为腰坝绿洲地下水位动态变化主要受人工开采影响,总体趋势表现为持续下降,并在开采期局部地区形成地下水位降落漏斗,受地下水位动态变化影响,绿洲防护林及周边荒漠植被处于衰退阶段,出现退化或大面积死亡现象。

Groundwater Dynamic Characteristics And The Influence On Vegetation Variation in the Yaoba Oasis

Groundwater resource is the main source of water supply in oasis of the arid and semi-arid area.With the increasingly expanding of development scale of the oasis,the exploitation of groundwater has been increased in order to meet the growing demand for water supply,which leads to the geo-ecological environment problems.Combining the methods of field survey,accessing,unified test,we collected the related information,determined groundwater level and analyzed the annual and inter-annual change characteristics of groundwater level dynamic.It is concluded that the dynamic variation of groundwater level was mainly influenced by artificial exploitation and the general trend indicated continuous decline,the groundwater-table depression cones formed in local area during exploitation period.Under the influence of dynamic change of groundwater level,the shelter forest in oasis and desert vegetation in surrounding area are at the declining stage,degeneration and large-area deaths appeared.