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DOI:	10.1371/journal.pone.0091204
论文题名:	Effects of Soil Warming and Nitrogen Addition on Soil Respiration in a New Zealand Tussock Grassland
作者:	Scott L. Graham; John E. Hunt; Peter Millard; Tony McSeveny; Jason M. Tylianakis; David Whitehead
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2014
发表日期:	2014-3-12
卷:	9, 期:3
语种:	英语
英文关键词:	Soil respiration ; Grasslands ; Biomass (ecology) ; Seasons ; Carbon dioxide ; Aquatic respiration ; Climate change ; Atmospheric chemistry
英文摘要:	Soil respiration (RS) represents a large terrestrial source of CO2 to the atmosphere. Global change drivers such as climate warming and nitrogen deposition are expected to alter the terrestrial carbon cycle with likely consequences for RS and its components, autotrophic (RA) and heterotrophic respiration (RH). Here we investigate the impacts of a 3°C soil warming treatment and a 50 kg ha−1 y−1 nitrogen addition treatment on RS, RH and their respective seasonal temperature responses in an experimental tussock grassland. Average respiration in untreated soils was 0.96±0.09 μmol m−2 s−1 over the course of the experiment. Soil warming and nitrogen addition increased RS by 41% and 12% respectively. These treatment effects were additive under combined warming and nitrogen addition. Warming increased RH by 37% while nitrogen addition had no effect. Warming and nitrogen addition affected the seasonal temperature response of RS by increasing the basal rate of respiration (R10) by 14% and 20% respectively. There was no significant interaction between treatments for R10. The treatments had no impact on activation energy (E0). The seasonal temperature response of RH was not affected by either warming or nitrogen addition. These results suggest that the additional CO2 emissions from New Zealand tussock grassland soils as a result of warming-enhanced RS constitute a potential positive feedback to rising atmospheric CO2 concentration.
URL:	http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0091204&type=printable
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/20113
Appears in Collections:	过去全球变化的重建影响、适应和脆弱性科学计划与规划气候变化与战略全球变化的国际研究计划气候减缓与适应气候变化事实与影响

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journal.pone.0091204.PDF（420KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	View Download

作者单位:

School of Biological Sciences, University of Canterbury, Christchurch, New Zealand;Landcare Research, Lincoln, New Zealand;Landcare Research, Lincoln, New Zealand;Landcare Research, Lincoln, New Zealand;Landcare Research, Lincoln, New Zealand;School of Biological Sciences, University of Canterbury, Christchurch, New Zealand;Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, Berkshire, United Kingdom;Landcare Research, Lincoln, New Zealand

Recommended Citation:

Scott L. Graham,John E. Hunt,Peter Millard,et al. Effects of Soil Warming and Nitrogen Addition on Soil Respiration in a New Zealand Tussock Grassland[J]. PLOS ONE,2014-01-01,9(3)

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