【摘要】 通过对不同时段和不同监测点环境监测数据的对比分析 ,研究蓟运河干流地表水质的时空变化特征 .结果发现 ,在空间上 ,蓟运河干流自上游至下游 ,地表水质总体上表现为不断恶化的趋势 ;在时间上 ,除了 NH4- N浓度有增加的趋势外 ,其它各项监测指标的浓度 ,1 998年与 1 995年和 1 990年相比 ,没有明显的变化 .分析影响蓟运河地表水质变化的原因主要为 :土地利用结构变化 ,如耕地面积增加和林草地面积减少 ;城镇集中区大量工业废水和生活污水的排放 .更多还原

【Abstract】 The temporal and spatial characteristics of surface water quality in Jiyun river are analyzed based on environmental measurement data.It was found that ground water quality of Jiyun river is deterioration from upper to lower part.Compared to the 1995 and 1990,there is no obvious change for most pollutants content except for the content of ammonia nitrogen.The reasons inducing the temporal and spatial change of surface water quality in Jiyun river are following:the land use change,such as increase of agricultural land and decrease of woodland or grassland,discharge of industry wastewatep and domestic sewage.更多还原