九龙江流域大气氮干沉降 | Dry deposition of atmospheric nitrogen to Jiulong River watershed in southeast China
2006
陈能汪 | 洪华生 | 肖健 | 张珞平 | 王吉苹
对九龙江流域10个站位的大气氮干沉降量进行为期1a的连续观测。利用专用降尘缸湿法收集大气沉降氮,在获取各月氮组分浓度和相应水样体积后,求得各月氮沉降速率,再将各月数值相加得到全年的大气氮干沉降量。结果表明,九龙江流域大气氮干沉降表现出一定的时空差异性,总氮沉降量为3·41~7·63kgN/(hm2·a),铵氮为1·02~3·00kgN/(hm2·a),硝氮为0·76~1·76kgN/(hm2·a)。干沉降中氮的3种主要形态铵氮、硝氮与有机氮分别占总沉降量的31%、24%和45%。中游漳州地区的大气氮干沉降总量较大。上游龙岩地区与中游漳州地区具有较高的铵氮沉降量,硝态氮在上下游间无明显变化,而有机氮沉降量在中下游地区较高。在时间尺度上,大气氮干沉降呈现出夏秋两季比春冬两季略高的总体趋势,季节性差异显著(p<0·05)。大气氮干沉降时空差异主要与氮排放量和气象条件有关。 【英文摘要】 In this study, bulk samplers that use a water surface to collect dry deposition were used in ten sites throughout the Jiulong River watershed, an agriculture-dominated watershed located in southeastern China with a drainage area of 1.41×10~4 km~2. Bulk samples were collected monthly. On the day after collection, aliquots of water samples containing dry depositions were taken to the laboratory where different nitrogen species were measured followed by filtration through 0.45 μm Nucleopore membranes. Based on...
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