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亚高山森林根系腐殖化是地下土壤形成和碳吸存的重要途径之一,并可能受到根系直径和物种类型的影响.对川西亚高山两个优势林木粗枝云杉(Picea asperata)和岷江冷杉(Abies faxoniana)细根(直径≤2 mm)、中根(直径2-5 mm)和粗根(直径5-10 mm)的腐殖化特征进行分析.结果表明:粗枝云杉和岷江冷杉腐殖质碳、富里酸碳、胡敏酸碳含量受根系径级的显著影响,并随根系径级增大而减少.表征腐殖化度的两个指标(Δlog K和E4/E6)在两个林木之间差异显著,粗枝云杉腐殖化程度高于岷江冷杉.单因素方差分析表明粗枝云杉和岷江冷杉腐殖化度受根系径级显著影响,随径级的增大呈减小趋势.两种林木细根、中根和粗根的腐殖化度分别为40.13%-41.66%、36.13%-38.86%、27.19%-27.51%.综上所述,川西亚高山森林林木细根更有利于腐殖化.
The root humification of subalpine forests is one of the important ways of soil formation and carbon sinks in the soil and may be affected by root diameter and species types.On the basis of the analysis of two dominant forest species, Picea asperata and Minjiang (Abies faxoniana) fine roots (diameter ≤ 2 mm), the middle root (diameter 2-5 mm) and coarse roots (diameter 5-10 mm) of humification characteristics were analyzed.The results show that: the rough spruce and Abies faxoniana The contents of humus carbon, fulvic acid and humic acid were significantly affected by the diameter of root system and decreased with the increase of root diameter.The two indicators (Δlog K and E4 / E6) Significant difference between the trees, the degree of remnant spruce humification higher than that of Minjiang fir.The single factor analysis of variance showed that the degree of root diameter of the rough spruce and Minjiang River firming degree significantly affected, with decreasing diameter class was reduced The trend of humification of fine root, middle root and coarse root were 40.13% -41.66%, 36.13% -38.86%, 27.19% -27.51%, respectively.In summary, the fine roots of subalpine forest in western Sichuan More conducive to humification.