摘要
在1990～1998年,监测了挪威境内10条河流所传输的有机和无机物质。有机物在河流悬浮物中占40%～80%,其中的主要成分为C/N摩尔比值大于25的溶解有机碳。对于以森林为主的集水流域的河流,有机物的C/N比随流量的增加而增加,而对于以山地为主的集水流域的河流,有机物的C/N比并不受流量的影响。室内实验表明,当盐度增加到30时,仍有超过90%的溶解有机碳处于溶液中。在凝絮和固着物中有机物的含量低于5%,C/N比值介于6.7～12.4,与种植土壤和沿岸海洋沉积物的C/N比相似。从而证实了被河流携带入海的有机物中只有一少部分沉积在海岸带。
The transport of organic and inorganic material in 10 Norwegian rivers has been monitored from 1990 to 1998. The suspended material in the rivers consisted of 40–80% organic materials. A major part of this was DOC with a C/N mole ratio > 25. The C/N ratio of the organic material increases with increasing river flow when drained from forest-dominated catchments, in contrast to mountain dominated catchments where variation in runoff does not influence the C/N ratio. Laboratory experiments showed that more than 90% of the DOC remained in solution when salinity increased to 30. The flocculated and settled material contained less than 5% organic material with a C/N ratio of 6.7–12.4, comparable to C/N ratios in cultivated soils and coastal marine sediments. This confirms that only a minor amount of organic material carried to the sea by rivers settles in the coastal zone.
