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Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland


Ruttig, T and Hovenden, MJ, Soil nitrogen cycle unresponsive to decadal long climate change in a Tasmanian grassland, Biogeochemistry, 147, (1) pp. 99-107. ISSN 0168-2563 (2020) [Refereed Article]

Copyright Statement

Copyright 2019 The Authors

DOI: doi:10.1007/s10533-019-00627-9


Increases in atmospheric carbon dioxide (CO2) and global air temperature affect all terrestrial ecosystems and often lead to enhanced ecosystem productivity, which in turn dampens the rise in atmospheric CO2 by removing CO2 from the atmosphere. As most terrestrial ecosystems are limited in their productivity by the availability of nitrogen (N), there is concern about the persistence of this terrestrial carbon sink, as these ecosystems might develop a progressive N limitation (PNL). An increase in the gross soil N turnover may alleviate PNL, as more mineral N is made available for plant uptake. So far, climate change experiments have mainly manipulated one climatic factor only, but there is evidence that single-factor experiments usually overestimate the effects of climate change on terrestrial ecosystems. In this study, we investigated how simultaneous, decadal-long increases in CO2 and temperature affect the soil gross N dynamics in a native Tasmanian grassland under C3 and C4 vegetation. Our laboratory 15N labeling experiment showed that average gross N mineralization ranged from 4.9 to 11.3gNg−1day−1 across the treatment combinations, while gross nitrification was about ten-times lower. Considering all treatment combinations, no significant effect of climatic treatments or vegetation type (C3 versus C4 grasses) on soil N cycling was observed.

Item Details

Item Type:Refereed Article
Keywords:nitrogen cycle, nitrification, nitrogen mineralisation, elevated carbon dioxide, FACE, experimental warming, global change, elevated CO2, warming, gross mineralization, gross nitrification, nutrient limitation
Research Division:Biological Sciences
Research Group:Other biological sciences
Research Field:Global change biology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Hovenden, MJ (Professor Mark Hovenden)
ID Code:136871
Year Published:2020
Funding Support:Australian Research Council (DP0984779)
Web of Science® Times Cited:6
Deposited By:Plant Science
Deposited On:2020-01-21
Last Modified:2020-03-10

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