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PLoS One. 2011;6(11):e27645. doi: 10.1371/journal.pone.0027645. Epub 2011 Nov 11.

The effects of warming and nitrogen addition on soil nitrogen cycling in a temperate grassland, northeastern China.

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1
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Xiangshan, Beijing, China.

Abstract

BACKGROUND:

Both climate warming and atmospheric nitrogen (N) deposition are predicted to affect soil N cycling in terrestrial biomes over the next century. However, the interactive effects of warming and N deposition on soil N mineralization in temperate grasslands are poorly understood.

METHODOLOGY/PRINCIPAL FINDINGS:

A field manipulation experiment was conducted to examine the effects of warming and N addition on soil N cycling in a temperate grassland of northeastern China from 2007 to 2009. Soil samples were incubated at a constant temperature and moisture, from samples collected in the field. The results showed that both warming and N addition significantly stimulated soil net N mineralization rate and net nitrification rate. Combined warming and N addition caused an interactive effect on N mineralization, which could be explained by the relative shift of soil microbial community structure because of fungal biomass increase and strong plant uptake of added N due to warming. Irrespective of strong intra- and inter-annual variations in soil N mineralization, the responses of N mineralization to warming and N addition did not change during the three growing seasons, suggesting independence of warming and N responses of N mineralization from precipitation variations in the temperate grassland.

CONCLUSIONS/SIGNIFICANCE:

Interactions between climate warming and N deposition on soil N cycling were significant. These findings will improve our understanding on the response of soil N cycling to the simultaneous climate change drivers in temperate grassland ecosystem.

PMID:
22096609
PMCID:
PMC3214076
DOI:
10.1371/journal.pone.0027645
[Indexed for MEDLINE]
Free PMC Article
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