Full text not available from this repository.

Abstract

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 11.3 µg N g−1 day−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 Type:	Article
Authors/Creators:	Ruttig, T and Hovenden, MJ
Keywords:	nitrogen cycle, nitrification, nitrogen mineralisation, elevated carbon dioxide, FACE, experimental warming, global change, elevated CO2, warming, gross mineralization, gross nitrification, nutrient limitation
Journal or Publication Title:	Biogeochemistry
Publisher:	Kluwer Academic Publ
ISSN:	0168-2563
DOI / ID Number:	https://doi.org/10.1007/s10533-019-00627-9
Copyright Information:	Copyright 2019 The Authors
Related URLs:	Google Scholar: Hovenden, MJ UTAS Profile: Hovenden, MJ
Item Statistics:	View statistics for this item

Actions (login required)

Item Control Page