| 摘要: |
| 【目的】研究森林火灾后兴安落叶松林土壤有机碳储量的分布规律，为林火干扰后寒温带森林生态系统土壤碳库的研究提供参考。【方法】以内蒙古大兴安岭兴安落叶松林不同年份（2003年和2007年）火烧迹地为研究区，划分不同火烧程度（轻度和重度），于2010-07进行土壤调查取样，分析不同火烧年份和不同火烧程度对0～40 cm土层土壤碳储量的影响。【结果】1）与未过火区相比，轻度火灾后冻土区0～30 cm土层土壤碳储量均存在不同程度的损失，而30～40 cm土层土壤碳储量有不同程度的积累；而重度火灾后冻土区0～40 cm土层土壤碳储量均存在不同程度损失。2）在0～10 cm土层中，不同程度火烧迹地土壤碳储量的分布没有一致性规律，而在10～40 cm土层，土壤碳储量的分布表现出随土层深度增加而降低的一般性规律。3）在0～10 cm土层，2003年火烧迹地土壤碳储量相对2007年火烧迹地要低；而在10～40 cm土层则呈相反趋势。【结论】林火一定程度上切断了森林土壤有机质的来源，导致森林土壤碳储量下降，表层土壤碳储量受火烧年份影响差异明显，深层土壤碳储量受火烧程度影响差异明显。 |
| 关键词: 森林火灾 火烧迹地 碳储量 冻土区 大兴安岭 |
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| 基金项目:国家自然科学基金项目（30960317）；内蒙古自治区科技创新引导奖励资金项目（20101914） |
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| Distribution of permafrost carbon storage in burned forest of Larix gemelinii |
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LI Pan,LI Qi,ZHOU Mei,et al
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| Abstract: |
| 【Objective】To improve the research on soil carbon pool after forest fire disturbance,the regularities of soil organic carbon in burned forest of Larix gemelinii forest were studied.【Method】SOC was measured for different fire years (2003 and 2007) and burning intensities (lightly and severely) in burned areas of Inner Mongolia Great Xing’an Mountain Larix gemelinii forest in July 2010 to analyze the effects of forest year and intensity on soil carbon storage.【Result】1) Compared with unburned area,SOC decreased at the depth of 0-30 cm after light fire but increased at the depth of 30-40 cm,and SOC decreased at the depth of 0-40 cm after severe fire.2) The distribution of SOC was irregular at the depth of 0-10 cm in burned areas with different intensities,but the distribution of SOC at the depth of 10-40 cm decreased as the increase of soil layer depth.3) SOC of 2003 was lower than 2007 at the depth of 0-10 cm,but that of 2003 was higher than 2007 at the depth of 10-40 cm.【Conclusion】The sources of soil organic matter were cut off by forest fire,leading to low SOC.SOC of surface soil was influenced more by forest fire years while SOC of deep soil was influenced more by forest fire intensities. |
| Key words: forest fire burned area carbon storage permafrost area Great Xing’an Mountain |
