河西走廊疏勒河灌区地下水特征现状分析

依据实际观测的1984-2013年地下水水位资料、2013年地下水水质化验及2011年水利普查有关成果, 对甘肃省河西走廊疏勒河灌区地下水特征现状进行了分析. 结果表明: 疏勒河灌区地下水开发利用以农业用水为主, 1984-2013年30 a来地下水水位变化总体特征为稳中下降, 个别地方地下水位略有上升; 地下水埋深在1.30～80.00 m之间, 年内地下水水位随灌溉制度变化显著, 年调节能力强. 地下水水质均超Ⅲ类, 由于农业生产大量使用氮肥, 氨氮指标最大值超Ⅲ类标准0.7倍, 是造成灌区地下水面源污染的主要因素.

Groundwater in the Shule River irrigation area of Hexi Corridor: Characteristics and current situation

According to the observed groundwater table data from 1984 to 2013, groundwater quality analysis in 2013 and census for water in 2011, the groundwater resources characteristics and current situation in the Shule River irrigation area were analyzed. The results showed that exploitation and utilization of groundwater was mainly for agricultural irrigation, the groundwater table had been in steady state with a little decline in the 30 years, but groundwater table rose slightly in some places. The groundwater depth varied in between 1.30-80.00 m. Groundwater table changed with the irrigation system significantly within the year. The groundwater quality exceeded Class III. Due to using a large amount of nitrogen fertilizer in agriculture, maximum ammonia nitrogen index was 0.7 times more than that of Class III, which was the dominant factor causing groundwater pollution.