NDLI: Combined climate factors alleviate changes in gross soil nitrogen dynamics in heathlands

Content Provider	Springer Nature Link
Author	Björsne, Anna Karin Rütting, Tobias Ambus, Per
Copyright Year	2014
Abstract	The ongoing climate change affects biogeochemical cycling in terrestrial ecosystems, but the magnitude and direction of this impact is yet unclear. To shed further light on the climate change impact, we investigated alterations in the soil nitrogen (N) cycling in a Danish heathland after 5 years of exposure to three climate change factors, i.e. warming, elevated CO2 (eCO2) and summer drought, applied both in isolation and in combination. By conducting laboratory 15N tracing experiments we show that warming increased both gross N mineralization and nitrification rates. In contrast, gross nitrification was decreased by eCO2, an effect that was more pronounced when eCO2 was combined with warming and drought. Moreover, there was an interactive effect between the warming and CO2 treatment, especially for N mineralization: rates increased at warming alone but decreased at warming combined with eCO2. In the full treatment combination, simulating the predicted climate for the year 2075, gross N transformations were only moderately affected compared to control, suggesting a minor alteration of the N cycle due to climate change. Overall, our study confirms the importance of multifactorial field experiments for a better understanding of N cycling in a changing climate, which is a prerequisite for more reliable model predictions of ecosystems responses to climate change.
Starting Page	191
Ending Page	201
Page Count	11
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	120
Issue Number	1-3
e-ISSN	1573515X
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-05-15
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	15N tracing Climate change Elevated CO2 Warming Summer drought Nitrogen cycle Biogeosciences Ecosystems Environmental Chemistry Life Sciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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