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林业科学 ›› 2021, Vol. 57 ›› Issue (8): 13-23.doi: 10.11707/j.1001-7488.20210802

• 论文与研究报告 • 上一篇    下一篇

寒温带冻土区火烧木管理方式对土壤呼吸及其组分的影响

王梓璇1,王鼎2,赵鹏武3,4,张岐岳3,杨磊3,周梅3,4,*   

  1. 1. 甘肃省治沙研究所 兰州 730070
    2. 甘肃农业大学资源与环境学院 兰州 730070
    3. 内蒙古农业大学林学院 呼和浩特 010019
    4. 内蒙古赛罕乌拉森林生态系统国家定位研究站 赤峰 024000
  • 收稿日期:2020-01-25 出版日期:2021-08-25 发布日期:2021-09-30
  • 通讯作者: 周梅
  • 基金资助:
    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)

Effects of Management Methods of Burned Wood on Soil Respiration and Its Components in the Permafrost Region of Cold Temperate Zone

Zixuan Wang1,Ding Wang2,Pengwu Zhao3,4,Qiyue Zhang3,Lei Yang3,Mei Zhou3,4,*   

  1. 1. Gansu Desert Control Research Institute Lanzhou 730070
    2. College of Resources and Environment Sciences, Gansu Agricultural University Lanzhou 730070
    3. College of Forestry, Inner Mongolia Agricultural University Hohhot 010019
    4. Saihanwula National Forest Ecosystem Research Station Chifeng 024000
  • Received:2020-01-25 Online:2021-08-25 Published:2021-09-30
  • Contact: Mei Zhou

摘要:

目的: 研究大兴安岭冻土区兴安落叶松林火烧迹地不同火烧木管理方式对土壤呼吸速率及组分的影响,探讨土壤呼吸与土壤温度和含水率的相关性,旨在为火烧后森林恢复与重建提供理论依据。方法: 以寒温带冻土区兴安落叶松林2009年火烧迹地为对象,使用LI-8100土壤呼吸速率测定系统,于2016和2017年生长季观测土壤呼吸速率,同时测定10 cm深处土壤温度和含水率季节变化,比较不同火烧木管理样地(火烧木皆伐,2009C;火烧木择伐,2009S;火烧木未伐,2009N)与对照样地(未火烧未采伐,2009CK)的土壤温度和含水率变化对土壤呼吸速率的影响。结果: 观测期内,4类样地土壤呼吸速率(RS)与土壤异养呼吸速率(RH)表现为2009S>2009N>2009CK>2009C;土壤自养呼吸速率(RA)2016年表现为2009N>2009S>2009CK>2009C,2017年表现为2009CK>2009N>2009S>2009C。4类样地均呈土壤异养呼吸速率贡献率(CH)大于自养呼吸速率贡献率(CA)。CA在对照样地最大(23.75%),在火烧木皆伐样地最小(16.04%),表现为2009CK>2009N>2009S>2009C。4类样地RS及其组分与10 cm深处土壤温度(T10)极显著正相关(P < 0.01)。火干扰降低了RS及其组分与10 cm深处土壤温度的敏感系数。结论: 在冻土区兴安落叶松林,火烧增加了RSRH,火烧木择伐进一步增加了RSRHP > 0.05)。火烧木皆伐会降低RS及其组分,且2009C样地的土壤RA显著低于2009CK(P < 0.05)。火干扰降低了土壤自养呼吸速率贡献率,火烧木采伐对此进一步降低,且采伐强度越大时降低越多。4类样地土壤呼吸速率及其组分与10 cm深处土壤温度显著正相关(P < 0.01)。3类火烧木管理样地的土壤呼吸速率及其组分对温度的敏感度均低于对照样地。火烧迹地土壤呼吸速率及其组分与10 cm深处土壤含水率的正相关性不显著。

关键词: 兴安落叶松林, 火烧迹地, 火烧木管理, 土壤呼吸, 土壤呼吸组分

Abstract:

Objective: The effects of different management methods of burned wood on soil respiration and its composition in the burned area of Larix gmelinii forest in the Daxing'anling permafrost region were investigated to understand the relations of soil respiration to soil temperature and moisture content, and to provide a theoretical basis for the restoration and reconstruction of the burned forest. Method: The burned area of L. gmelinii forest in 2009 in the cold temperate zone permafrost region were investigated using LI-8100 soil respiration measurement system to detect soil respiration rate in 2016 and 2017, while the seasonal variation of soil temperature and moisture content were also measured at the same time. The effects of soil temperature and moisture content changes on soil respiration rate were investigated and made a comparison among the sample plots of burned wood management (2009C for clear-cutting of burned wood, 2009S for selective cutting, and 2009N for no-cutting) and the control plots (2009CK for no-fire and no-cutting). Result: During the observation period, soil respiration rate (RS) and soil heterotrophic respiration rate (RH) in four models of sample plots were ranked as 2009S > 2009N > 2009CK > 2009C. In 2016, soil autotrophic respiration rate (RA) was ranked from large to small as 2009N > 2009S > 2009CK > 2009C. In 2017, it was 2009CK > 2009N > 2009S > 2009C. Four types of sample plots displayed that the soil heterotrophic respiration contribution ratio (CH) was larger than the soil autotrophic respiration contribution ratio (CA). The greatest CA was in the control plot (23.75%), while the minimum was in 2009C (16.04%), with a rank of 2009CK > 2009N > 2009S > 2009C. Soil respiration and its components were positively correlated with T10 in four sample plots (P < 0.01). Fire interference reduced the sensitivity coefficient of soil respiration and its components to the temperature. Conclusion: In the L. gmelinii forest in the Daxing'anling permafrost region, burning increased soil respiration rate, and soil heterotrophic respiration rate, which were further increased by selective cutting. However, all the increases were not significant (P > 0.05). Cutting the burned wood restricted the soil respiration rate and its components, and the soil autotrophic respiration rate of the 2009C significantly decreased from 2009CK (P < 0.05). Burning interference also diminished the contribution ratio of soil autotrophic respiration rate and cutting of the burned wood further reduced the CA, the higher the cutting intensity, the greater the decrease. The soil respiration and its components in the four types of sample plots revealed strongly significant positive correlation with 10 cm soil temperature (P < 0.01). The sensitivity of soil respiration and its components to soil temperature in the three sample plots of burned wood was lower than that in the control plots. There were no significant positive relations between soil respiration with its components and the 10 cm soil moisture content in the burned area of L. gmelinii forest permafrost region (P > 0.05).

Key words: Larix gmelinii forest, burned area, management of burned wood, soil respiration, soil respiration components

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