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    商帅帅, 宋明华, 王春梅, 邱景琮, 王鑫晴, 王诗淇, 崔佳一. 长期多形态氮添加对温带人工辽东栎林土壤N2O排放的影响[J]. 北京林业大学学报, 2022, 44(6): 63-73. DOI: 10.12171/j.1000-1522.20220136
    引用本文: 商帅帅, 宋明华, 王春梅, 邱景琮, 王鑫晴, 王诗淇, 崔佳一. 长期多形态氮添加对温带人工辽东栎林土壤N2O排放的影响[J]. 北京林业大学学报, 2022, 44(6): 63-73. DOI: 10.12171/j.1000-1522.20220136
    Shang Shuaishuai, Song Minghua, Wang Chunmei, Qiu Jingcong, Wang Xinqing, Wang Shiqi, Cui Jiayi. Effects of long-term polymorphic nitrogen addition on soil N2O emission in temperate artificial Quercus liaotungensis forests[J]. Journal of Beijing Forestry University, 2022, 44(6): 63-73. DOI: 10.12171/j.1000-1522.20220136
    Citation: Shang Shuaishuai, Song Minghua, Wang Chunmei, Qiu Jingcong, Wang Xinqing, Wang Shiqi, Cui Jiayi. Effects of long-term polymorphic nitrogen addition on soil N2O emission in temperate artificial Quercus liaotungensis forests[J]. Journal of Beijing Forestry University, 2022, 44(6): 63-73. DOI: 10.12171/j.1000-1522.20220136

    长期多形态氮添加对温带人工辽东栎林土壤N2O排放的影响

    Effects of long-term polymorphic nitrogen addition on soil N2O emission in temperate artificial Quercus liaotungensis forests

    • 摘要:
        目的  研究长期氮沉降对森林土壤可利用氮的浓度和土壤N2O排放的影响,对于控制土壤温室气体排放、提高区域碳源汇评估的准确度等具有重要的意义。
        方法  本文以温带森林土壤为研究对象,通过长期(11年)野外氮添加控制试验,采用静态箱/气相色谱法分析3种氮素添加水平(对照、低水平:50 kg/(hm2·a)、高水平:150 kg/(hm2·a))和3种氮素化学形态(硝态氮:NaNO3;铵态氮:(NH4)2SO4和混合态氮:NH4NO3)对温带人工林土壤N2O排放通量的影响。
        结果  (1)氮素形态和氮添加水平引起土壤NH4+-N和NO3-N的显著累积,且NO3-N的累积效应远远高于NH4+-N;(2)不同水平和形态的氮添加均促进了N2O排放。低水平和高水平NaNO3、(NH4)2SO4、NH4NO3添加分别使土壤N2O年累积排放量增加了87.39%和146.79%、86.13%和74.91%、98.67%和50.50%。长期氮添加对土壤N2O排放的促进态势有所改变,高水平NH4+-N和NH4NO3对土壤N2O排放的促进效应低于低水平添加;(3)结合前期研究结果推测,硝化反应是温带人工林土壤N2O排放的主导过程,NH4+-N比NO3-N转化为N2O的效率更高。
        结论  本研究强调了长期野外监测的重要性,氮添加对土壤N2O排放的影响具有阶段性,如果试验时间短,氮添加对温带森林土壤N2O排放的促进效应可能会被高估。

       

      Abstract:
        Objective  Exploring the effects of long-term nitrogen deposition on the concentration of available nitrogen and soil N2O emissions in forest soil is important for controlling soil greenhouse gas emissions and improving the accuracy of regional carbon source sink assessment.
        Method  The effect of N addition at different levels (control, 50 kg/(ha·year), 150 kg/(ha·year)) and forms (nitrate N: NaNO3; ammonium N: (NH4)2SO4 and mixed N: NH4NO3) on N2O emission from temperate plantation soils was analyzed by a field N addition control experiment using static chamber/gas chromatography.
        Result  (1) The forms and levels of N addition caused significant accumulation of soil NH4+-N and NO3-N. The accumulation effect of NO3-N was much higher than that of NH4+-N. (2) Soil N2O emissions were promoted by different forms and levels of N additions. Low and high levels of NaNO3, (NH4)2SO4, and NH4NO3 additions increased annual cumulative soil N2O emissions by 87.39% and 146.79%, 86.13% and 74.91%, 98.67% and 50.50%, respectively. (3) Combined with the results of our previous study, we speculated that nitrification reaction was the dominant process of N2O emission from temperate plantation soils, and NH4+-N was more efficiently converted to N2O than NO3-N.
        Conclusion  The effect of long-term nitrogen addition on soil N2O emissions is stage-specific. Therefore, we emphasize the importance of long-term field monitoring, and the contribution effect of N addition on soil N2O emissions from temperate forests may be overestimated if the experimental period is short.

       

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