Increases in organic carbon and nitrogen concentrations in boreal forested catchments — Changes driven by climate and deposition

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Ahti Lepistö, Antti Räike, Tapani Sallantaus, Leena Finér. Increases in organic carbon and nitrogen concentrations in boreal forested catchments — Changes driven by climate and deposition. Science of The Total Environment 780 (2021), 146627, ISSN 0048-9697. https://doi.org/10.1016/j.scitotenv.2021.146627

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Title: Increases in organic carbon and nitrogen concentrations in boreal forested catchments — Changes driven by climate and deposition
Author: Lepistö, Ahti; Räike, Antti; Sallantaus, Tapani; Finér, Leena
Publisher: Elsevier
Date: 2021
Language: en
Belongs to series: Science of The Total Environment 780 (2021), 146627
ISSN: 0048-9697
DOI: https://doi.org/10.1016/j.scitotenv.2021.146627
URI: http://hdl.handle.net/10138/334927
Abstract: Brownification, caused by increasing dissolved organic carbon (DOC) concentrations is a threat to aquatic ecosystems over large areas in Europe. The increasing concentrations of DOC in northern boreal streams and lakes have attracted considerable attention with proposed important drivers such as climate, deposition and land-use, and complex interactions between them. Changes in total organic N (TON) concentrations have received less attention, even though carbon and nitrogen losses are highly related to each other. We used long-term (1990–2019) monitoring records of 12 small data-rich headwater forested catchments in a large gradient of climate and deposition. We found that total organic carbon (TOC) concentrations were significantly increasing in almost all study catchments. The mean air temperature and change in sulphate concentrations had a strong, significant correlation to TOC change-%. Both explained, alone, more than 65% of the change in TOC concentrations, and, together, up to 83% of the variation. Sulphur deposition has already decreased to low levels, our results indicate that its importance as a driver of TOC leaching has decreased but is still clearly detected, while the impact of climate warming as a driver of TOC leaching will be even more pronounced in the future. A positive correlation was found between drainage-% and increases in TON, suggesting also importance of land management. TON trends were tightly connected to changes in TOC, but not directly linked to decreasing S deposition.
Description: Highlights • Brownification is an increasing threat to aquatic ecosystems. • Reasons behind changes in C and N concentrations in forested streams were studied. • TOC and TON concentrations increased significantly in 7–10 of 12 forested catchments in 30 yrs. • Air temperature and sulphate concentrations explained 83% of the TOC variation. • TON trends were connected to TOC and linked to climatic factors and drainage-%.
Subject: brownification
TOC
TON
temperature
S deposition
forest management
Subject (ysa): aikasarjat
orgaaninen aines
humus
typpi
rikki
laskeumat
liuennut orgaaninen hiili
lämpötila
metsänhoito
metsätalous
Suomi
Rights: https://creativecommons.org/licenses/by-nc-nd/4.0/


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