摘要
198 9- 0 5～ 1 990 - 0 4期间在罗纳河下游近入海口处按月采集溶解及颗粒态样品 ,分析了其中的营养盐、铝及常量元素含量。结果表明 ,罗纳河中硝酸盐、磷酸盐、硅酸盐的平均浓度分别为65.7,3.8,79.8μmol/ dm3。研究的周年内变化范围大 ,其含量明显高于世界上其它受人文活动冲击较小的河流。而在同样的时间尺度下 ,河流中溶解态铝的含量变化较大 ,其含量先随流量的增加而增加 ,其后则由于高流量的稀释作用而下降 ;颗粒态铝的含量则保持在一个较为稳定的水平上。研究结果表明 ,河流中的铝主要来自岩石风化 ,人为活动对其影响较小。通过溶解态铝与营养盐含量的统计分析表明 ,罗纳河中的溶解态铝与初级生产之间不存在相关关系 ,它的含量主要受界面吸附过程控制。通过对常量元素的分析表明 ,罗纳河中常量阴阳离子的含量顺序为 HCO-3 >Ca2 +>SO2 -4 >Na+>Cl->Mg2 +>K+,流域内溶解态组份的含量主要受碳酸盐的溶蚀控制。
Dissolved nutrients, aluminum, major elements and suspended matter samples from the Rhne River were monthly collected from the lower reaches (30km inland from the river mouth) from May, 1989 to April, 1990. The results show that the concentrations of nitrate, phosphorus and silicate are highly variable during the field observations, the mean concentrations being 65.7, 3.8 and 79.8μmol/dm3, respectively. The dissolved aluminum concentration changed considerably during the period, depending upon water discharge, while the particulate aluminum concentration showed a somewhat stable distribution. The result shows that the contribution from anthropogenic activities is limited. Weathering and erosion accounts for the most of the dissolved aluminum in the drainage basin. Statistical data analysis shows that there is no correlation between the dissolved aluminum and nutrients, the most important process controlling the concentration of aluminum is dominated by the adsorption/desorption reaction between the interfaces. The concentration order of the major elements is HCO-_3>Ca 2+>SO 2-_4>Na+>Cl->Mg 2+>K+, which is controlled by the weathering and erosion of carbonates.
出处
《青岛海洋大学学报（自然科学版）》
CSCD
北大核心
2002年第6期993-1000,共8页
Journal of Ocean University of Qingdao
基金
国家重点基础研究专项经费 ( G1999043705)
国家自然科学基金 ( 4952560 9
40036010 )资助
