 |
| Titel |
Spatial patterns of some trace elements in four Swedish stream networks |
| VerfasserIn |
J. Temnerud, A. Düker, S. Karlsson, B. Allard, K. Bishop, J. Fölster, S. Köhler |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 3 ; Nr. 10, no. 3 (2013-03-01), S.1407-1423 |
| Datensatznummer |
250018132
|
| Publikation (Nr.) |
 copernicus.org/bg-10-1407-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Four river basins in southern Sweden, with catchment sizes from 0.3 to
127 km2 (median 1.9), were sampled in October~2007. The 243 samples
were analysed for 26 trace elements (Ag, As, Au, Ba, Be, Bi, Cd, Co, Cr, Cu,
Ga, Ge, In, La, Li, Mo, Ni, Pb, Sb, Se, Sn, Tl, Ti, U, V and Zn) to identify
spatial patterns within drainage networks. The range and median of each
element were defined for different stream orders, and relationships to
catchment characteristics, including deposition history, were explored. The
sampling design made it possible to compare the differences along 40 stream
reaches, above and below 53 stream junctions with 107 tributaries and between
the 77 inlets and outlets of 36 lakes. The largest concentration differences
(at reaches, junctions and lakes) were observed for lakes, with outlets
usually having lower concentration compared to the inlets for As, Ba, Be, Bi,
Cd, Co, Cr, Ga, Ge, Ni, Pb, Sn, Ti, Tl, U, V and Zn. Significantly lower
concentrations were observed for Cd and Co when comparing headwaters with
downstream sites in each catchment. Common factor analysis (FA) revealed that
As, Bi, Cr, Ga, Ge, Tl and V co-vary positively with Al, Fe and total organic
carbon (TOC) and negatively with La, Li and pH. The strong removal of a large
number of trace elements when passing through lakes is evident though in the FA,
where lake surface coverage plots opposite to many of those
elements. Forest volume does not respond in a similar systematic fashion and,
surprisingly, the amount of wetland does not relate strongly to either Fe or
TOC at any of the rivers. A better understanding of the quantitative removal
of organic carbon and iron will aid in understanding trace element fluxes
from landscapes rich in organic matter and iron. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|