Short-term Effects of Nitrogen Additions and Increased Temperature on Wetland Soil Respiration, Sanjiang Plain, China
Short-term Effects of Nitrogen Additions and Increased Temperature on Wetland Soil Respiration, Sanjiang Plain, China
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DOI：
10.1007/s13157-013-0432-y
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发表时间：
2013-05
期刊：
影响因子：
2
通讯作者：
Baoxian Tao;C. Song;Yuedong Guo
中科院分区：
文献类型：
--
作者：
Baoxian Tao;C. Song;Yuedong Guo
氮沉降和全球变暖都有可能通过改变分解来改变土壤碳储量，但氮添加和温度对湿地土壤CO2产生的综合影响研究较少。在这项研究中，我们进行了实验室培养，以探讨这一问题，土壤从淡水沼泽在三江平原，中国。我们发现，氮添加量和温度有负面和正面的影响，CO2的生产，分别。尽管分解速率较低，但由于重质组分在土壤中的质量比例较大，对CO2的产生有显著的贡献。短期内，施氮量和温度的联合作用对CO2产生的影响呈拮抗作用。基于氮的有效性随着氮的添加和温度的升高而增加，额外的土壤来源的氮的释放可能进一步抑制CO2的产生。我们建议，短期土壤CO2生产的同时影响下的温度和氮添加可能会高估基于他们的单一影响在这个网站。
Nitrogen deposition and global warming each have potential to alter soil carbon storage via changing decomposition, but combined effects of N addition and temperature on CO2production in wetland soils are less studied. In this study, we conducted laboratory incubations to examine this problem using soil from a freshwater marsh in Sanjiang Plain, China. We found that N addition and temperature had a negative and positive effect on CO2production, respectively. Despite low decomposition rates, heavy fractions had a notable contribution to CO2production due to greater mass proportion in soil. Short-term combined effect of N addition and temperature on CO2production was antagonistic. Based on greater N availability as N addition and temperature increasing, extra release of soil-derived N may further suppress CO2production. We suggest that short-term soil CO2production under simultaneous influence of temperature and N addition may be overestimated based on their single effects in this site.