NDLI: Increased organic carbon concentrations in Estonian rivers in the period 1992

Content Provider	Springer Nature Link
Author	Pärn, Jaan Mander, Ülo
Copyright Year	2011
Abstract	There are 10,091 km2 of peatlands in Estonia and human activities may have changed the role of northern peatlands from global sinks to global sources of carbon. The aim of this work was to explain the changes in organic carbon exports from eleven Estonian rivers in the period 1992–2007 in terms of land use change, climate change quantified by trends in stream-water discharge and hydrological droughts and reductions in atmospheric sulfate quantified by change in water chemistry. Direct TOC (total organic carbon) measurements had been initiated in 1998. We used CODKMnO4 (permanganate oxygen consumed) as its surrogate for the whole time span (Spearman’s determination coefficient in six small northern Estonian rivers 0.95 > ρ2 > 0.72; p < 0.01). The Mann–Kendall test revealed significant trends in the TOC proxy in five small rivers in northern Estonia (M–K stat > 2.35; p < 0.05). The trends in the eleven investigated streams correlated closely with the increased 28 ratios of drought days (Spearman’s ρ2 = 0.68; p < 0.01). The correlations with land use compositions, decreases in water discharges and SO4 2− concentrations were insignificant (p > 0.05). We conclude that the main factor in the increase of organic carbon export is the deepening of droughts driven by climate change, magnified by man-made drainage.
Starting Page	351
Ending Page	358
Page Count	8
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	108
Issue Number	1-3
e-ISSN	1573515X
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-05-06
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Bog Catchment Climate change Landscape Mire Sulphate deposition Life Sciences Environmental Chemistry Biogeosciences Ecosystems
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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