马占相思人工林土壤温室气体排放日变化规律研究
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广州市森林碳汇计量与监测项目(GZFC-KT2)


Diurnal variations in greenhouse gas emissions from Acacia mangium plantation soil
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    【目的】探索马占相思Acacia mangium人工林土壤温室气体排放日变化规律,确定最佳观测时间。【方法】采用静态箱-气相色谱法,对华南地区马占相思人工纯林土壤3种温室气体CO2、CH4、N2O通量进行连续观测。【结果】马占相思人工林土壤3种温室气体具有明显的日变化特征,马占相思人工林土壤为CO2和N2O的排放源及CH4的吸收汇,其通量日变化幅度分别为:401.33~555.59 mg·m-2·h-1、24.50 ~ 34.2 μg·m -2·h-1 和-10.96~-41.88μg·m-2·h-1。地表CO2、CH4通量和5 cm深土壤温度呈极显著(P <0.01)或显著(P <0.05)相关,地表N2O通量同温度的相关性不显著。【结论】通过对矫正系数分析,综合考虑3种温室气体以及取样的可操作性,华南地区马占相思人工林雨季的最佳观测时间为09:00时左右。

    Abstract:

    【Objective】 In order to study the diurnal variations in fluxes of greenhouse gases including CO2, CH4 and N2O from Acacia mangium plantation soil, and determine the optimal observation time. 【Method】The emission fluxes of CO2, CH4 and N2O from A. mangium plantation soil in southern China were continually observed using static-chamber and gas chromatograph. 【Result】The fluxes of CO2, CH4 and N2O from A. mangium plantation soil had clear diurnal variations. The A. mangium plantation soil was a source of CO2 and N2O and a sink of CH4. The daily fluxes of CO2, N2O and CH4 ranged from 401.33 to 555.59 mg·m-2·h-1, 24.50 to 34.72 μg·m-2·h-1 and -10.96 to -41.88 μg·m-2·h-1 respectively. The fluxes of CO2 or CH4 from soil surface had highly significant (P<0.01) or significant (P<0.05) positive correlations with soil temperature at 5 cm depth, while CH4 flux from soil surface was not significantly correlated with soil temperature.【Conclusion】Based on the analysis of the correction coefficients of three greenhouse gases and manipulability of sampling, the optimal time for collection and observation of these three greenhouse gases from A. mangium plantation in southern China during rainy seasons is around 09:00.

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贾朋,魏龙,王燕,刘珊,高常军,周平,李吉跃.马占相思人工林土壤温室气体排放日变化规律研究[J].华南农业大学学报,2016,37(6):84-90

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  • 收稿日期:2016-01-10
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  • 在线发布日期: 2016-11-02