基于生态安全的干旱区绿洲生态需水研究

Study on ecological water requirement of the arid area oasis based on the theory of ecological security

从绿洲生态安全的科学内涵出发,提出用于维护干旱区绿洲生态安全的3项指标,即适宜的绿洲规模、适宜的耕地面积和适宜的地下水位值。同时指出适宜的绿洲规模不仅是指面积指标,也应反映绿洲植被盖度指标。以民勤绿洲为研究区域,计算得出基于适宜绿洲规模的天然植被和人工植被生态需水量为1.27×108m3;基于适宜耕地面积的地下水入渗补给量为0.3234×108m3;基于适宜地下水位值的地下水位恢复的生态需水量,即人工补给回灌量为0.1892×108m3;最后得出基于生态安全的绿洲生态总需水量为1.46×108m3。这可为今后研究区生态恢复和治理提供一定的决策依据。

As a result of the analysis of the oasis＇ ecological status quo, the appropriate size of the oasis, farmland and the ground water table are the important indexes expressing the ecological security of oasis. Based on these three indicators, the ecological water demand in line with the actual development of oasis can be calculate. In the Minqin oasis region, the calculated ecological water demand is 1.46 ×10^8m^3, including the original and planted vegetation water demand 1.27 ×10^8m^3. and the ground water restoration demand 0.1892 ×10^8m^3.