寒温带杜香兴安落叶松林土壤CH_4通量研究
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摘要
本研究利用静态箱-气相色谱法对寒温带兴安落叶松林生长盛季及冻融期森林土壤CH_4通量进行原位观测和研究。结果表明:
该地区在生长盛季森林土壤总体表现为大气CH_4的吸收,CH_4日平均通量为(Mean±SE)-0.05±0.01mg·m~(-2)·h~(-1),且峰值出现在0:00和16:00左右。在生长盛季整体上原状林地土壤和无凋落物覆盖不同处理对土壤CH_4通量的影响无显著差异,但在变化幅度和时间分布上有一定差异,无凋落物处理下土壤的CH_4吸收通量变化幅度大于原状林地土壤。观测期间土壤CH_4通量与温度具有一定的正相关关系,但线性相关系数较小,而与湿度相关性不显著,表明该地区在生长盛季土壤温度在控制土壤CH_4通量中表现出重要性。
在冻融期,该地区土壤CH_4通量日变化曲线表现出不同的特征,CH_4仍表现出吸收状态。土壤CH_4通量日变化整体上呈现双峰曲线,且峰值出现的时间也各异,表现出不规则变化曲线。
冻融期原状林地土壤和无凋落物覆盖不同处理下森林土壤CH_4通量的变化特征表现不一,不同处理间土壤CH_4通量表现出显著性差异,即无凋落物处理CH_4通量显著高于原状林地土壤。
Flux of soil CH_4 was measured by closed static chamber-gas chromatograph technique in larix gmelinii forest of Great Hingan mountains during the peak of growing season, then, the flux of soil CH_4 was measured during the freezing-thawing period in cold temperate zone.
The results showed that the soil of this region was a sink of CH_4 to the atmosphere as a whole during the peak of growing season,the daily mean soil CH_4 flux(mean±SE) was -0.05±0.01 mg·m~(-2)·h~(-1) during the observation period and the peak values appeared at about 0:00 and 16:00 respectively. Removal of surface litter had no significant effect on CH_4 flux during the observation period,but there are some differences in the scale and time distribution.the Iitter-free plot has larger scale than the plot with Iitters. CH_4 flux was obviously correlated with soil temperature,but the liner correlation coefficient is relatively small.However,CH_4 flux was not correlated with soil moisture,which indicated that soil temperature was a main factor to control the CH_4 flux during the peak of growing season in this region.
The diurnal variation of CH_4 flux showed different characteristics in larix gmelinii forest of Great Hingan mountains during the freezing-thawing period. It was a absorption of CH_4 flux as a whole. the diurnal variation of CH_4 flux showed double peak curves, the time of the peak occurring was different and exhibited irregular curves.
Removal of surface litter had different effect on CH_4 flux during the freezing-thawing period. There was significant effect on CH_4 flux.CH_4 flux of the Iitter-free plot was larger than the plot with Iitters.
该地区在生长盛季森林土壤总体表现为大气CH_4的吸收,CH_4日平均通量为(Mean±SE)-0.05±0.01mg·m~(-2)·h~(-1),且峰值出现在0:00和16:00左右。在生长盛季整体上原状林地土壤和无凋落物覆盖不同处理对土壤CH_4通量的影响无显著差异,但在变化幅度和时间分布上有一定差异,无凋落物处理下土壤的CH_4吸收通量变化幅度大于原状林地土壤。观测期间土壤CH_4通量与温度具有一定的正相关关系,但线性相关系数较小,而与湿度相关性不显著,表明该地区在生长盛季土壤温度在控制土壤CH_4通量中表现出重要性。
在冻融期,该地区土壤CH_4通量日变化曲线表现出不同的特征,CH_4仍表现出吸收状态。土壤CH_4通量日变化整体上呈现双峰曲线,且峰值出现的时间也各异,表现出不规则变化曲线。
冻融期原状林地土壤和无凋落物覆盖不同处理下森林土壤CH_4通量的变化特征表现不一,不同处理间土壤CH_4通量表现出显著性差异,即无凋落物处理CH_4通量显著高于原状林地土壤。
Flux of soil CH_4 was measured by closed static chamber-gas chromatograph technique in larix gmelinii forest of Great Hingan mountains during the peak of growing season, then, the flux of soil CH_4 was measured during the freezing-thawing period in cold temperate zone.
The results showed that the soil of this region was a sink of CH_4 to the atmosphere as a whole during the peak of growing season,the daily mean soil CH_4 flux(mean±SE) was -0.05±0.01 mg·m~(-2)·h~(-1) during the observation period and the peak values appeared at about 0:00 and 16:00 respectively. Removal of surface litter had no significant effect on CH_4 flux during the observation period,but there are some differences in the scale and time distribution.the Iitter-free plot has larger scale than the plot with Iitters. CH_4 flux was obviously correlated with soil temperature,but the liner correlation coefficient is relatively small.However,CH_4 flux was not correlated with soil moisture,which indicated that soil temperature was a main factor to control the CH_4 flux during the peak of growing season in this region.
The diurnal variation of CH_4 flux showed different characteristics in larix gmelinii forest of Great Hingan mountains during the freezing-thawing period. It was a absorption of CH_4 flux as a whole. the diurnal variation of CH_4 flux showed double peak curves, the time of the peak occurring was different and exhibited irregular curves.
Removal of surface litter had different effect on CH_4 flux during the freezing-thawing period. There was significant effect on CH_4 flux.CH_4 flux of the Iitter-free plot was larger than the plot with Iitters.
引文
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