首页|不同时间序列林火干扰对兴安落叶松林区土壤性质及温室气体通量的影响

不同时间序列林火干扰对兴安落叶松林区土壤性质及温室气体通量的影响

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
林火是森林生态系统的重要干扰因素之一。在内蒙古大兴安岭兴安落叶松（Larix gmelinii）林区，分别选取2014年、2006年、1995年、1986年的火烧区，以临近未过火区作为对照，研究在火烧发生0、8、19、28年后，4个不同时间序列下林火干扰对土壤温室气体通量和土壤性质的影响。结果表明：火烧发生0、8、19、28年后，土壤pH分别较对照增加了7.7%、2.0%、3.4%、4.0%；土壤有机质含量分别较对照降低了63.8%、26.6%、35.3%、11.3%，土壤全氮含量分别较对照降低了53.2%、19.7%、21.7%、16.2%；土壤有效氮含量在火烧发生0年和8年后分别较对照降低了28.1%和9.5%，火烧发生19年后较对照增加了16%；火烧发生28年后土壤有效氮含量与对照无显著差异。CH4平均吸收通量在火烧发生0、8、19年后，较对照分别下降了51.0%、45.0%、7.1%，火烧发生28年后与对照相比差异不显著。火烧发生当年，CO2通量较对照增加了64.5%，其他3个时间序列火烧对土壤温室气体通量的影响结果不一。火烧发生当年，N2O排放通量较对照增加了69.2%，达到最高排放量139.3μg·m-2·h-1。火烧发生8、19、28年后土壤N2O排放通量分别较对照减少了5.6%、14.6%、37.9%。温室气体通量和土壤性质的灰色关联分析表明，CH4和 CO2通量与土壤有机质含量关联度最大，N2O 排放通量与土壤全氮含量关联度最大。火灾发生当年土壤CH4的吸收下降，土壤CO2和N2O的排放增加，随着植被的演替和土壤生态系统的逐步恢复，火灾发生区与未过火区之间的土壤性质及温室气体通量的差异逐渐变小。
Effects of Forest Fire Disturbance in Different Time Series on Soil Properties and Greenhouse Gas Flux in Larix gmelinii Forest of Cold-temperate Zone
Fire is one of the most important disturbance factors in forest ecosystem. Four different areas with different disturbances series in Larix gmelinii forest were selected to determine the effects of forest fire on soil properties and greenhouse gas flux. The results showed that:Soil pH had increased 7.7%, 2.0%, 3.4%and 4.0%, soil organic matter had decreased 63.8%, 26.6%, 35.3%and 11.3%, soil total nitrogen content had decreased 53.2%, 19.7%, 21.7% and 16.2% after 0, 8, 19 and 28 years respectively when compared with their corresponding control. Soil available nitrogen content had decreased 28.1% and 9.5% after 0 and 8 years respectively, but increased 16% after 19 years when compared with their corresponding control, and there was no significant difference among the burned area and control when forest fire occurred 28 years later. CH4 absorbing flux had decreased significantly after fire, especially in the fire occurred year, this effect had disappeared 28 years later after fire occurred. CH4 absorbing flux decreased 51.0%, 45.0%, 7.1%after 0, 8 and 19 years respectively. CO2 flux had increased 64.5%after fire occurred when compared with the control, but no obvious uniformly results was found in other three different time series fire disturbance. Soil N2O emission flux had increased 64.5%after fire occurred year when compared with the control. Soil N2O emission had decreased 5.6%, 14.6%and 37.9% after fire occurred after 8, 19 and 28 years respectively. After analyzed grey correlation among soil properties and greenhouse gas flux, soil organic matter content had the highest correlation degree with CH4 flux and CO2 flux, N2O flux had the highest correlation degree soil total nitrogen. In conclusion, forest fire in Larix gmelinii areas decreased soil methane absorbing and increased soil CO2 and N2O emission obviously in the very year fire occurred, but this effect had been decreased and even disappeared with the succession of vegetation and soil after fire.

fire disturbanceLarix gmeliniiCH4CO2N2Osoil organic mattersoil total Nsoil available N

马秀枝、范雪松、舒常禄、李长生

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内蒙古农业大学林学院，内蒙古 呼和浩特 010019

内蒙古农业大学生态环境学院，内蒙古 呼和浩特 010019

内蒙古通辽市气象局，内蒙古 通辽 028000

林火干扰 兴安落叶松 CH4 CO2 N2O 土壤有机质 土壤全氮 土壤速效氮

由国家自然科学基金由国家自然科学基金内蒙古自然科学基金

31160117312601192014MS0319

2016

10.16258/j.cnki.1674-5906.2016.06.005

生态环境学报
广东省生态环境与土壤研究所 广东省土壤学会

生态环境学报

CSTPCDCSCD北大核心
影响因子：1.608
ISSN：1674-5906
年,卷(期)：2016.25(6)
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