摘要
研究区浅层地下水中的NO-3质量浓度在时间分布上与降雨(包括降雨期、降雨量)和施肥(包括施肥期、施肥量)存在较大的相关性。同一年内9月份(丰水期末)浅层地下水中NO-3质量浓度大于5月份(枯水期末)的质量浓度。年际间总体变化趋势随年降雨量的变化而变化。在空间分布上主要受地下水水位埋深、水力坡度、含水层岩性及厚度的影响,水位埋深越大、含水层渗透性越强、水力坡度越小,浅层地下水中NO-3质量浓度增高的趋势越明显。为验证上述定性分析所得结论的可靠性,采用因子分析法对上述时空变量进行了定量评价。结果表明,研究区浅层地下水中的氮污染主要是上述时空变量共同影响的结果,其中降雨和水位埋深对其影响程度相对较大。
The nitrogen concentration in the shallow groundwater in the north high plain of Songhua River in Songnen Basin has an intimate relationship with precipitation and fertilization according to the temporal distribution. In the same year, the nitrogen concentration in the shallow groundwater in September (the end of bumper rain term) is higher than that in May (the end of withered rain term), and the nitrogen concentration changes with the variation of precipitation during many years. As for the spatial distribution, the nitrogen concentration depends mainly on the groundwater level depth, hydraulic gradient, lithology and thickness of the aquifer. In order to check whether the conclusions of the qualitative analysis discussed above are correct or not, factor analysis method was applied to evaluate quantitatively the temporal and spatial variables mentioned above. It was found that nitrogen pollution in sha-(llow) ground water is due to the comprehensive influences of the fertilizer, water level depth, precipitation, hydraulic gradient and lithology and thickness of the aquifer. Especially the precipitation and water level depth have more responsibilities for the nitrogen pollution in shallow groundwater.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2004年第2期231-235,共5页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(49572158)
