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生态学杂志 ›› 2004, Vol. ›› Issue (5): 46-52.

• 研究报告 • 上一篇    下一篇

长白山阔叶红松林土壤N2O排放通量的变化特征

肖冬梅1, 王淼1, 姬兰柱1, 韩士杰1, 王跃思2   

  1. 1. 中国科学院沈阳应用生态研究所, 沈阳, 110016;
    2. 中国科学院大气物理研究所, 北京, 100029
  • 收稿日期:2003-12-28 修回日期:2004-02-17 出版日期:2004-10-10
  • 通讯作者: 王淼
  • 基金资助:
    国家自然科学基金项目(303710681);中国科学院沈阳应用生态研究所创新资助项目(SCXZD0101-02)

Variation characteristics of soil N2O emission flux in broad-leaved Korean pine forest of Changbai Mountain

XIAO Dongmei1, WANG Miao1, JI Lanzhu1, HAN Shijie1, WANG Yuesi2   

  1. 1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2003-12-28 Revised:2004-02-17 Online:2004-10-10

摘要: 采用静态密闭箱/气相色谱分析方法对长白山阔叶红松林两个样地的N2O排放通量进行了测定。结果表明,凋落物对林地土壤N2O排放的影响是显著的,其对全年N2O排放的平均贡献率是36.89%。长白山阔叶红松林土壤是大气N2O一个重要的源,但在极少的天气状况下也能吸收大气中的N2O,而起着汇的作用。其排放通量的变化范围是-41.48~291.84μgN2O·m-2·h-1,平均通量是68.7μgN2O·m-2·h-1,高于其他类型林地的排放通量,且变动范围也较其他森林类型大。无凋落物林地土壤N2O排放通量变化范围是-23.24~93.75μgN2O·m-2·h-1,平均通量为33.79μgN2O·m-2·h-1。两个样地N2O排放通量的季节变化特征相似:夏季N2O的排放通量最高,春季次之,秋冬两季较低且趋于平稳。昼夜变化趋势也相似:N2O排放通量的最大值都出现在18:00,最小值都出现在12:00和14:00。研究还表明,林地土壤N2O的排放通量与地表温度和地下5cm温度的相关性较好,无凋落物的样地N2O的排放通量仅与地下5cm温度的相关性较好。

关键词: 固相微萃取, 美洲斑潜蝇, 挥发性有机物, 田间诱捕试验

Abstract: The soil N2O emission fluxes in the two plots of broad-leaved Korean pine forest were measured by static closed chamber-gas chromatograph in Changbai Mountain.The results showed that litter increased N2O emission flux of the forest soil by 36.89%.Broad-leaved & Korean pine forest soil of Changbai Mountain was an important source of atmospheric N2O .But in exceptional weather,it was the sink by absorbing N2O in the atmosphere.The N2O emission flux of the forest soil ranged from -41.48 to 291.84μg·m-2·h-1,with the mean of 68.7μg·m-2·h-1,which was much higher than other types of forest.Furthermore,its variation range was also broader.The N2O emission flux range of the litter-free soil was from -23.24 to 93.75μg·m-2·h-1,with an average of 33.79μg·m-2·h-1.The two plots showed similar seasonal variations with the highest emission flux in Spring,the higher in Summer and the lower in Autumn and Winter.The diurnal variation was also similar: The maxima of the two plots both occurred at 18 O'clock,and the minima appeared at 12 O'clock and 14 O′,clock.The results also indicated that N2O emission flux of the forest soil was positively correlated to soil temperatures at 0 cm and 5 cm depth,while N2O emission flux of the litter-free soil only had relation with the soil temperature at 5 cm depth.

Key words: Solid phase microextraction, Liriomyza sativae, Volatile organic compounds, Field trapping trials

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