Five-year study of the effects of simulated nitrogen deposition levels and forms on soil nitrous oxide emissions from a temperate forest in northern China.
Five-year study of the effects of simulated nitrogen deposition levels and forms on soil nitrous oxide emissions from a temperate forest in northern China.
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模拟氮沉降水平和形式对中国北方温带森林土壤一氧化二氮排放影响的五年研究
DOI：
10.1371/journal.pone.0189831
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Yang X
中科院分区：
文献类型：
--
作者：
Xu K;Wang C;Yang X
很少有研究量化不同水平和形式的氮 (N) 沉降对温带森林土壤一氧化二氮 (N2O) 排放的影响。在中国北方西山实验林站，采用静态密闭室法，进行了为期5年的田间试验，研究了多种形式和水平的氮添加对土壤N2O排放的影响。实验包括对照（不添加 N），以及添加 NH4NO3、NaNO3 和 (NH4)2SO4，每种都有两个水平：50 kg N ha−1 yr−1 和 150 kg N ha−1 yr−1。对所有样地进行处理，以模拟每年生长季（3月至10月）期间逐月增加的氮沉降，并从2011年3月至2016年2月每月测量土壤N2O排放量。同时，还测量了土壤的温度、湿度和无机氮含量，以探讨影响土壤N2O排放的主要因素。结果表明，施氮类型和水平显着提高了土壤无机氮含量，且土壤NO3--N积累量显着高于土壤NH4+-N积累量。与对照相比，三种氮形态显着增加了平均 N2O 排放量（P < 0.05），顺序为 NH4NO3 > (NH4)2SO4 > NaNO3，分别增加了 355.95%、266.35% 和 187.71%。 NH4+-N添加对N2O排放的促进作用明显强于NO3--N添加，且高水平N添加效果强于低水平添加。氮添加对初始年份N2O累积排放量的影响显着较强，尤其是在N2O累积排放量增加达到最大的第三年。在后来的几年里，增长持续但有所减弱。增加无机氮浓度可使土壤由缺氮变为富氮，进而达到氮饱和，因此对土壤速效氮的促进作用先增大后减小。此外，土壤NH4+-N、NO3--N、温度和充水孔隙空间均与土壤N2O排放量呈正相关。这些发现表明，大气氮沉降可显着促进土壤N2O排放，温带森林的外源NH4+-N和NO3--N输入可对土壤N2O排放产生协同效应。在未来的研究中，应利用15N示踪方法在陆地生态系统的氮循环和平衡中更好地区分这两个方面。
Few studies have quantified the effects of different levels and forms of nitrogen (N) deposition on soil nitrous oxide (N2O) emissions from temperate forest soils. A 5-year field experiment was conducted to investigate the effects of multiple forms and levels of N additions on soil N2O emissions, by using the static closed chamber method at Xi Mountain Experimental Forest Station in northern China. The experiment included a control (no N added), and additions of NH4NO3, NaNO3, and (NH4)2SO4 that each had two levels: 50 kg N ha−1 yr−1 and 150 kg N ha−1 yr−1. All plots were treated to simulate increased N deposition on a monthly schedule during the annual growing season (March to October) and soil N2O emissions were measured monthly from March 2011 to February 2016. Simultaneously, the temperature, moisture, and inorganic N contents of soil were also measured to explore how the main factors may have affected soil N2O emission. The results showed that the types and levels of N addition significantly increased soil inorganic N contents, and the accumulation of soil NO3–-N was significantly higher than that of soil NH4+–N due to N addition. The three N forms significantly increased the average N2O emissions (P < 0.05) in the order of NH4NO3 > (NH4)2SO4 > NaNO3 by 355.95%, 266.35%, and 187.71%, respectively, compared with control. The promotion of N2O emission via the NH4+–N addition was significantly more than that via the NO3––N addition, while N addition at a high level exerted a stronger effect than at the low-level. N addition exerted significantly stronger effects on cumulative N2O emissions in the initial years, especially the third year when the increased cumulative N2O emission reached their maximum. In the later years, the increases persisted but were weakened. Increasing inorganic N concentration could change soil from being N-limited to N-rich, and then N-saturated, and so the promotion on soil available N effect increased and then decreased. Moreover, the soil NH4+–N, NO3–-N, temperature, and water-filled pore space were all positively correlated with soil N2O emissions. These findings suggest that atmospheric N deposition can significantly promote soil N2O emission, and that exogenous NH4+–N and NO3–-N inputs into temperate forests can have synergic effects on soil N2O emission. In future research, both aspects should be better distinguished in the N cycle and balance of terrestrial ecosystems by using 15N tracer methods.
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影响因子：
3.7
作者：
Gundersen, P;Emmett, BA;Tietema, A
通讯作者：
Tietema, A
中国亚热带氮饱和森林溶解有机氮大量流失
影响因子：
3.7
作者：
Fang, Yunting;Zhu, Weixing;Yoh, Muneoki
通讯作者：
Yoh, Muneoki
影响因子：
4
作者：
Fang, Huajun;Yu, Guirui;Luo, Yiqi
通讯作者：
Luo, Yiqi
DOI：
10.2136/sssaj1992.03615995005600010015x
发表时间：
1992-01-01
影响因子：
2.9
作者：
DAVIDSON, EA
通讯作者：
DAVIDSON, EA
长白山温带森林土壤 N2O 排放随氮添加的脉冲增加
影响因子：
3.7
作者：
Bai E;Li W;Li S;Sun J;Peng B;Dai W;Jiang P;Han S
通讯作者：
Han S