论文题目:

Effect of continued nitrogen enrichment on greenhouse gas emissions from a wetland ecosystem in the Sanjiang Plain, Northeast China: A 5 year nitrogen addition experiment

英文论文题目:

Effect of continued nitrogen enrichment on greenhouse gas emissions from a wetland ecosystem in the Sanjiang Plain, Northeast China: A 5 year nitrogen addition experiment

第一作者:

宋长春

英文第一作者:

Song, C. C.

联系作者:

宋长春

英文联系作者:

Song, C. C.

外单位作者单位:

英文外单位作者单位:

发表年度:

2013

卷:

118

期:

2

页码:

741-751

摘要:

Mounting evidence supports that wetland ecosystems, one of the largest carbon pools on the earth, are exposed to ample nitrogen (N) additions due to atmospheric deposition or N loading from upstream agricultural fertilizer application. However, our understanding of how N enrichment affects the fluxes of greenhouse gases (GHGs) in wetlands is weak. A 5year N addition experiment was conducted to examine the responses of CH4 and N2O fluxes as well as ecosystem respiration from wetlands in the Sanjiang Plain, Northeast China, through 2005 to 2009. Four levels of N addition (control, 0kgN ha(-1)yr(-1); low-level, 60kgN ha(-1)yr(-1); medium-level, 120kgN ha(-1)yr(-1); high-level, 240kgN ha(-1)yr(-1)) were designed in this study. Overall, our results show that medium and high levels of N addition increased ecosystem respiration by 28% and 69% (P<0.05), respectively, while low-level N addition has no effect on ecosystem respiration (P>0.05). High-level N fertilization exerted stronger effects on ecosystem respiration in the initial year than the following years. It indicated that the effects of high-level N fertilization on CO2 might be overestimated by short-term observations. High-level N fertilization increased N2O emissions by 396% over the 5years (P<0.05), but the low- and medium-level-N addition did not exert any apparent effect on N2O emissions (P>0.05). N2O emission under high-level N addition in the first and fifth years showed stronger pronounced responses to N addition compared with that from the third and fourth years, indicating the importance of long-term field observation. Over the 5years, however, the low and medium-level N addition showed no effect on N2O emissions. The four levels of N addition exerted no effect on CH4 emissions (P>0.05). Furthermore, the relationship between GHGs and soil temperature or water table depth varied among different plots and experimental time. Our findings highlighted the importance of gas species, experimental time, and the amount of fertilizer N with regard to the responses of GHG emissions to N fertilization.

英文摘要:

刊物名称:

Journal of Geophysical Research-Biogeosciences

英文刊物名称:

Journal of Geophysical Research-Biogeosciences

论文全文:

英文论文全文:

全文链接:

其它备注:

英文其它备注:

学科:

英文学科:

影响因子:

第一作者所在部门:

英文第一作者所在部门:

论文出处:

英文论文出处:

论文类别:

英文论文类别:

参与作者:

英文参与作者:

Wang, L. L.; Tian, H. Q.; Liu, D. Y.; Lu, C. Q.; Xu, X. F.; Zhang, L. H.; Yang, G. S.; Wan, Z. M.