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

作　　者：Linna Ma、Xiaotao Lv、Yang liu、Jixun Guo、Nanyi Zhang、Jianqin Yang、Renzhong Wang
影响因子：4.411
刊物名称：PLoS ONE
出版年份：2011
卷：6  期：11  页码：e27645

论文摘要：

 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.
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