Pulse increase of soil N2O emission in response to N addition in a temperate forest on Mt Changbai, northeast China.
Pulse increase of soil N2O emission in response to N addition in a temperate forest on Mt Changbai, northeast China.
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长白山温带森林土壤 N2O 排放随氮添加的脉冲增加
DOI：
10.1371/journal.pone.0102765
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Han S
中科院分区：
文献类型：
--
作者：
Bai E;Li W;Li S;Sun J;Peng B;Dai W;Jiang P;Han S
自工业革命以来，全球氮沉降显著增加。以前的研究表明，氮沉积的气体排放的响应有争议的结果，指出系统的具体影响的N添加。在中国东北的温带天然林中进行了一个氮添加试验，以测试氮沉降的潜在变化如何改变土壤N2 O排放及其来源于硝化和反硝化作用。2012年7 - 10月，采用密闭箱法测定了土壤N2 O排放量，并采用乙炔抑制法进行了单独培养试验，以确定土壤反硝化通量以及硝化和反硝化对N2 O排放的贡献。NH 4 NO3添加50公斤N/公顷/年显着增加N2 O和N2的排放量，但他们的“脉冲排放”诱导的N添加只持续了两个星期。平均硝化衍生的N2 O到反硝化衍生的N2 O的比例为0.56在对照地块，表明在研究区的N2 O排放的反硝化作用的贡献较高，这个比例是不受N添加。对照区N2 O与（N2+ N2 O）的比值为0.41-0.55，在一个采样时间点通过N添加降低。基于这个短期的实验，我们提出，N2 O和反硝化速率可能会增加，增加氮沉降至少相同的倍，在未来，这将加剧全球变暖问题。
Nitrogen (N) deposition has increased significantly globally since the industrial revolution. Previous studies on the response of gaseous emissions to N deposition have shown controversial results, pointing to the system-specific effect of N addition. Here we conducted an N addition experiment in a temperate natural forest in northeastern China to test how potential changes in N deposition alter soil N2O emission and its sources from nitrification and denitrification. Soil N2O emission was measured using closed chamber method and a separate incubation experiment using acetylene inhibition method was carried out to determine denitrification fluxes and the contribution of nitrification and denitrification to N2O emissions between Jul. and Oct. 2012. An NH4NO3 addition of 50 kg N/ha/yr significantly increased N2O and N2 emissions, but their “pulse emission” induced by N addition only lasted for two weeks. Mean nitrification-derived N2O to denitrification-derived N2O ratio was 0.56 in control plots, indicating higher contribution of denitrification to N2O emissions in the study area, and this ratio was not influenced by N addition. The N2O to (N2+N2O) ratio was 0.41–0.55 in control plots and was reduced by N addition at one sampling time point. Based on this short term experiment, we propose that N2O and denitrification rate might increase with increasing N deposition at least by the same fold in the future, which would deteriorate global warming problems.
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影响因子：
10.1
作者：
Keesing, F
通讯作者：
Keesing, F
影响因子：
3.7
作者：
Butterbach-Bahl, K;Breuer, L;Papen, H
通讯作者：
Papen, H
影响因子：
4.2
作者：
Ambus, P
通讯作者：
Ambus, P
影响因子：
9.7
作者：
DEBOER, W;TIETEMA, A;LAANBROEK, HJ
通讯作者：
LAANBROEK, HJ
DOI：
10.1073/pnas.1121448109
发表时间：
2012-02-28
影响因子：
11.1
作者：
Bernal, Susana;Hedin, Lars O.;Buso, Don C.
通讯作者：
Buso, Don C.