HR: 0830h
AN: H51C-1059    [PDF]
TI: Impact of Land-use and Climate on the Transport of TOC and Nutrients from Three Small Drainage Basins in North Europe
AU: * Arvola, L
EM: lauri.arvola@helsinki.fi
AF: University of Helsinki, Lammi Biological Station, Paajarventie, Lammi, Ham FIN-16900 Finland
AU: Hakala, I
EM: ilpo.hakala@helsinki.fi
AF: University of Helsinki, Lammi Biological Station, Paajarventie, Lammi, Ham FIN-16900 Finland
AU: Jarvinen, M
EM: marko.u.jarvinen
AF: University of Helsinki, Lammi Biological Station, Paajarventie, Lammi, Ham FIN-16900 Finland
AB: In this research we studied to what extent the concentrations and loads of carbon, nitrogen and phosphorus may vary seasonally and annually in three forested upstream rivers with slightly different land-use practices in the surrounding drainage area. The three drainage basins belong to the drainage area of Lake P„„j„rvi with a total area of 223 km$^{2}$. The data set consists of continuous discharge measurements in all rivers since early 1970's, and chemical analyses based on weekly sampling (or during a few winters biweekly or once a month) since autumn 1994. In the rivers the concentration of TOC, N and P varied seasonally up to 5-10 -fold, and their annual loads up to 4 fold. Within such a small geographical area the rivers behaved in a very coherent way both in terms of hydrology and nutrient concentrations. The results strongly support the hypothesis that besides land-use, climate is the key driving force which regulates not only short-term variability in nutrient concentrations and loads in boreal rivers, but very much also the annual loads of the nutrients. As a consequence of warmer winter conditions nutrient transportation to downstream lakes and seas from boreal drainage basins may substantially increase.
DE: 1803 Anthropogenic effects
DE: 1806 Chemistry of fresh water
DE: 1845 Limnology
DE: 1860 Runoff and streamflow
SC: Hydrology [H]
MN: 2003 Fall Meeting