Riverine inputs of organic carbon and nitrogen to Norwegian coastal areas |
| |
Authors: | Helland Aud Holtan Gjertrud Jørgensen Per |
| |
Institution: | Department of Soil and Water Science, Agricultural University of Norway, Aas. aud.helland@niva.no |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|