| 摘要: |
| 【目的】探讨森林火烧迹地皆伐后不同更新方式对土壤呼吸的影响，探明影响该区域土壤呼吸的主要因素，为科学评价不同更新方式对冻土区森林火烧迹地土壤碳通量的影响提供理论依据。【方法】以位于寒温带冻土区2003年发生火灾的内蒙古金河-根河森林为研究对象，设置天然乔木更新样地（NR）、人工乔木更新样地（AR）、人工促进乔木更新样地（AFR）和无乔木更新样地（NU）4种更新方式样地。于2017年和2018年植物生长季，使用LI 8100土壤呼吸测定系统对不同更新样地的土壤呼吸速率进行测定，同时测定10 cm深处的土壤温度（T10）和0~10 cm土层的土壤湿度（W10），分析土壤呼吸速率与T10和W10的关系。【结果】随着生长季时间的推移，不同更新样地土壤呼吸速率、T10总体上均呈先增大后降低的趋势。2018年不同更新样地乔木数量由多到少表现为NR＞AR＞AFR＞NU。2017年不同更新样地土壤呼吸速率由快到慢表现为NR＞AR＞NU＞AFR，2018年表现为NR＞NU＞AR＞AFR。2017年不同更新样地T10由高到低表现为AFR＞NR＞AR＞NU，2018年表现为AFR＞NR＞NU＞AR。2017年不同更新样地W10由大到小表现为NR＞AR＞AFR＞NU，2018年表现为NR＞AR＞NU＞AFR。土壤呼吸速率与T10的相关性较高，达极显著水平（P＜0.01）；与W10相关性不显著（P＞0.05）。【结论】NR样地土壤呼吸速率和乔木数量均大于其他3种类型，为火烧木皆伐迹地最好的更新方式。土壤温度对土壤呼吸速率影响较大，土壤湿度对土壤呼吸速率影响较小。 |
| 关键词: 冻土区 兴安落叶松林 火烧迹地 森林更新方式 土壤呼吸速率 水热因子 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目（41563006）；内蒙古自治区2018年博士科研创新项目（B2018111945） |
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| Soil respiration characteristics under different regeneration patterns of burned area of forest in the cold temperate zone |
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WANG Zixuan,WANG Ding,YANG Lei,et al
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| Abstract: |
| 【Objective】This study explored the effects of different regeneration patterns on soil respiration after clear cutting burned area and identified main influencing factors of soil respiration to provide basis for scientifical evaluation of the effects of regeneration patterns on soil carbon flux in burned areas in permafrost regions.【Method】 The Jinhe Genhe forest of Inner Mongolia that experienced fire in 2003 in permafrost region in the cold temperate zone was selected and sample plots were set in four regeneration patterns of natural regeneration (NR),artificial regeneration (AR),artificial forcing regeneration (AFR) and no regeneration (NU).The soil respiration rates in different plots were measured using Li-8100 soil respiration system in 2017 and 2018,10 cm soil temperature (T10) and 0-10 cm soil humidity (W10) were measured,and the relationships between them were analyzed.【Result】 With the passage of time,soil respiration rate and T10 in different regeneration sample plots increased first and then decreased.In 2018,the number of trees in different regeneration samples was in the order of NR>AR>AFR>NU.In 2017,soil respiration rate of different regeneration sample plots was in the order of NR>AR>NU>AFR and it was NR>NU>AR>AFR in 2018.In 2017,T10 of different regeneration sample plots was in the order of AFR>NR>AR>NU and it was AFR>NR>NU>AR in 2018.During 2017,W10 in different regeneration sample plots was in the order of NR>AR>AFR>NU,while in 2018 it was NR>AR>NU>AFR.The correlation between soil respiration rate and T10 was extremely significant (P<0.01),and the correlation with W10 was not significant (P>0.05).【Conclusion】The natural regeneration was the best pattern on burned wood clear cutting area with the highest soil respiration rate and number of trees.Soil temperature had large influence on soil respiration,while soil moisture had less effect. |
| Key words: permafrost region Larix gmelinii forest burned area forest regeneration patterns soil respiration rate hydrothermal factor |
