Root diameter controls the accumulation of humic substances in decomposing root litter
Root diameter controls the accumulation of humic substances in decomposing root litter
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根直径控制分解根凋落物中腐殖质的积累
DOI：
10.1016/j.geoderma.2019.04.016
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发表时间：
2019-08
期刊：
影响因子：
6.1
通讯作者：
Zhenfeng Xu
中科院分区：
文献类型：
--
作者：
Qun Liu;Liyan Zhuang;Rui Yin;Xiangyin Ni;Chengming You;Kai Yue;Bo Tan;Yang Liu;Li Zhang;Zhenfeng Xu
植物凋落物的腐殖化是陆地生态系统土壤有机质积累的关键步骤。然而，环境变化和底物质量如何影响根腐殖化仍然知之甚少。通过为期两年的凋落袋试验，研究了青藏高原东部两种常见亚高山乔木(云杉和冷杉)在海拔3037 m和3580 m的3个径级(0~2、2~5和5~10 mm)根部腐殖质残留量和腐殖质积累。不同海拔处理间腐殖质含量差异不显著。根质量损失和胡敏酸、胡敏酸、黄腐酸浓度均随根直径的增大而减小。腐殖酸浓度和腐殖化度均随根腐解的进行而降低，腐殖酸浓度则相反。我们的结果表明，腐殖质积累的直径差异明显大于分解根凋落物的海拔差异和种间差异。这些发现对在经历白雪覆盖的冬季的亚高山森林中通过根腐殖化进行碳固定具有重要意义。
The humification of plant litter is a crucial step for the buildup of soil organic matter in terrestrial ecosystems. Yet, how environmental change and substrate quality affect root humification still remains poorly understood. A two-year litterbag experiment was conducted to assess the root mass remaining and accumulation of humic substances in roots of three diameter classes (0–2, 2–5 and 5–10 mm) of two common subalpine tree species (Picea asperataandAbies faxoniana) at two elevations (3037 m and 3580 m) on the eastern Tibetan Plateau. No significant differences were found between elevation treatments in the concentration of humic substances. Both root mass loss and concentrations of humic substance, humic acid and fulvic acid decreased with increasing root diameter. Both fulvic acid concentration and humification degree declined as root decomposition progressed but humic acid concentration exhibited an opposite trend. Our results reveal that the diameter-associated variations in accumulation of humic substances were substantially stronger than altitudinal and interspecific differences in decomposing root litters. These findings have important implications for carbon sequestration via root humification in the subalpine forests experiencing snow-covered winter.
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