民勤盆地生态环境需水优先次序和需水量

Ecological environment water requirement priority and ecological environment water demand in MinQin Basin

北方干旱地区由于水资源短缺,全面满足所有生态类型需水要求几乎是不可能的。因此提出应基于各生态类型的生态服务价值进行不同类型生态环境需水优先次序的划分,结合区域水资源及生态环境特点,优先满足生态服务价值高的生态类型需水要求,这将具有重要的现实意义。按照上述理论,将民勤盆地生态功能区和生态环境需水类型需水优先次序进行了划分,并根据盆地实际情况,制定了各生态环境需水类型需水量的需水原则。通过分析,认为目前民勤盆地首要满足的是绿洲边缘的防风固沙林带和盆地地下水位恢复两项生态环境需水类型所需水量。根据计算结果这两项合计为1.4682×108m3,其中防风固沙林带生态环境需水量为1.077×108m3,用于地下水位恢复的人工补给回灌量为0.3912×108m3。并通过与相关研究结果比较,认为本次计算结果趋于合理。

Based on ecological value of each ecological environment water requirement functions, this paper proposed that it should classify water requirement priorities of the ecological water requirement type to meet the character of water shortage in arid region. According to this theory, with studied on Minqin Basin ecological problems, it planned the principle of water requirement of every ecological environment type. Then after determined the priorities to every type, this paper suggested that the current problem is to meet the water requirement of the sand shifting control forests living at the edge of oasis and the grounder water level rising in basin. And calculated these two types＇ water demands quantity was 1. 4682 × 10^8m^3. which the living of sand shifting control forest demand 1. 077 × 10^8 m^3, the recovery of artificial recharge groundwater demand 0. 3912 × 10^8m^3. And compared with the relevant research results finally, it pointed that this calculation results was reasonable.