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植物研究 ›› 2015, Vol. 35 ›› Issue (1): 110-116.doi: 10.7525/j.issn.1673-5102.2015.01.017

• 论文 • 上一篇    下一篇

抚育对长白山西坡杨桦幼龄林土壤呼吸及碳储量密度的影响

    

  1. 1.东北林业大学,哈尔滨 150040;
    2.黑龙江生态工程职业学院,哈尔滨 150025
  • 出版日期:2015-01-15 发布日期:2015-03-11
  • 基金资助:
     

Effect of Thinning on Respiration Rate and Soil Carbon Density of Young-age Poplar-birch Stands in Western Changbai Mountains

    

  1. 1.Northeast Forestry University,Harbin 150040;
    2.Heilongjiang Vocational Institutes of Ecological Engineering,Harbin 150025
  • Online:2015-01-15 Published:2015-03-11
  • Supported by:
     

摘要: 在长白山林区杨桦幼龄林中实施3种不同强度的抚育间伐(对照T0,低强度T1,高强度T2),调查林分凋落物分解速率、土壤A、B层碳储量密度和土壤呼吸强度等指标,分析不同间伐强度对森林土壤碳汇的影响,探讨间伐对土壤碳积累影响机理。结果表明:抚育间伐有利于林分凋落物的分解,叶凋落物分解失重率平均值大小为T2>T0>T1,但T1强度间伐叶凋落物碳素释放量最大,是分解前总重量的34.73%,高于T0和T2处理,说明T1强度间伐促进叶凋落物碳素释放。不同间伐强度对土壤各层含碳率影响不显著,但是有增加林地土壤碳储量的趋势,T1间伐强度下土壤总碳储量最大,其A层碳储量占土壤总碳储量比例最大,达到了80.95%,远远高于T0和T2处理。土壤呼吸速率与土壤温度的回归关系不显著,但是间伐改变了土壤温度,随着间伐强度的增大,土壤呼吸速率有降低的趋势。不同间伐处理土壤呼吸速率对土壤温度变化的敏感程度不同,Q10值为T1<T2<T0。研究结果表明间伐加快了林地凋落物分解并且有降低土壤呼吸速率的趋势,适宜强度的抚育间伐有利于增加林分土壤碳汇。

关键词: 杨桦林, 间伐强度, 碳储量密度, 凋落物分解, 土壤呼吸

Abstract: We used young-age Poplar-birch stands to set three thinning treatments level to collect litter decomposition rate, carbon storage of soil Layer A and Layer B and soil respiration rate, analyzed the effect of differ thinning treatments of soil carbon storage, and discussed the theory of impact of soil carbon accumulation. Thinning was helpful to the accumulation and decomposition of forest litter, leaf litter decomposition weightlessness rate average size of T2>T0>T1, but at the end of litter decomposition T1 intensity carbon to release a quantity was the largest, 34.73% of the total weight before decomposition, higher than T0 and T2. Different thinning intensity was not significant effect on soil carbon content in each layer, but has a tendency to increase forest soil carbon, T1 thinning intensity of soil total carbon storage is largest and it’s Layer A of soil total carbon ratio reached 80.95%, higher than T0 and T2. The regression of the soil respiration rate and soil temperature relationship was not significant, but thinning changed the soil temperature with the increase of thinning intensity, and soil respiration rate had a tendency to reduce. Different thinning of sensitivity of soil respiration rate of soil temperature was different, Q10 value for T1<T2<T0. Thinning accelerated the decomposition of forest litter accumulation and had a tendency to reduce the soil respiration rate, so the appropriate intensity of tending thinning achieved the aim to increase the forest carbon fixed amount.

Key words: Poplar-birch stands, thinning intensity, carbon storage, litter decomposition, soil respiration

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