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基于野外样点实测数据,分析了不同烈度火烧对大兴安岭呼中林区地上死木质残体碳储量的影响.结果表明:不同烈度的火烧会对地上死木质残体碳储量产生显著影响.兴安落叶松林和针阔混交林(落叶松与白桦)中死木质残体碳储量大小为重度火烧>轻度火烧>未火烧,而白桦林中死木质残体碳储量大小为重度火烧>未火烧>轻度火烧.火干扰能显著改变森林中死木质残体碳储量的组成百分比.随着火烧烈度的增加,枯立木比重显著增大,枯落物比重显著减小,而不同火烧烈度下倒木和树桩的碳储量比重变化不显著.不同烈度的火烧对死木质残体碳储量特征的影响不同,轻度火烧下死木质残体碳储量的空间变异性最高,重度火烧下空间变异性最弱.不同火烧烈度下大兴安岭森林死木质残体碳储量差异显著,在进行森林死木质残体碳储量估算时,需要充分考虑这种差异性.
Based on the data from field samples, the effects of fires with different intensities on the carbon stocks of dead woody debris in Huzhong forest area of Daxinganling were analyzed. The results showed that fires with different intensities had a significant effect on the carbon stocks of aboveground dead wood debris. The carbon stocks of dead woody debris in the pine and coniferous and broad-leaved mixed forests (Larix gmelinii and Betula platyphylla) were severe fire> mild fire> unburned while the carbon stocks of dead woody debris in the birch forest were severe fire> unfire> light Degree of fire.The fire disturbance can significantly change the composition percentage of carbon stock of dead wood debris in forest.With the increase of fire intensity, the proportion of dead wood increased significantly, the proportion of litter significantly decreased, while the burning wood and stump Of the total carbon stocks, the changes of the carbon stocks of insignificant changes were not significant.The effects of fires with different intensities on the carbon storage characteristics of dead wood residues were different, the spatial variability of carbon stocks of dead wood residues under mild fires was the highest, and the spatial variability was the weakest under severe fires. Under the fire intensity, there is significant difference in the carbon stocks of dead woody debris in the forest of Daxing’anling. When estimating the carbon stocks of dead woody debris in forest, this difference needs to be fully considered.