Root order and initial moisture status influenced root decomposition in a subtropical tree species Liquidambar formosana

Root order and initial moisture status influenced root decomposition in a subtropical tree species Liquidambar formosana
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根序和初始水分状态影响亚热带树种枫香的根分解

DOI:
10.1007/s11104-019-04248-x
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发表时间:
2019-08
期刊:
影响因子:
4.9
通讯作者:
Li Shuo
Li Shuo
中科院分区:
农林科学2区
文献类型:
--
作者:
Wang Peng;Liu Xiaoxue;Mou Pu;Guo Jin;Li Shuo

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根系分解在陆地生态系统的地球化学循环中起着重要的作用。然而,对于低阶根(较细)还是高阶根(较粗)衰减得更快仍然存在争议。以往的根系分解研究多采用干燥的根系样品,脱水过程会影响结果。在这项研究中,我们的目的是研究分解的低级和高级根,以及初始水分状况是否会影响他们的分解。对亚热带树种枫香的根系进行了为期一年的凋落物袋试验。分解的根分为低级(第1和第2阶)和高级(第3和第4阶)类,并在埋入土壤之前干燥或保持新鲜。我们发现,低阶根的分解速度较慢(在质量损失方面,高阶根的一半),可溶性碳水化合物的含量是主要的影响因素。我们还发现,干燥前分解促进分解的高阶根在早期的10%。我们的研究表明,凋落物碳质量,特别是可溶性碳水化合物含量,是根分解的主要驱动力,以前的研究使用干根样品可能高估了短期根分解。
Root decomposition plays an important role in biogeochemical cycles in terrestrial ecosystems. However, there is still controversy on whether low-order (finer) or high-order (coarser) roots decay faster. Previous studies on root decomposition often used dried root samples, and the dehydrating process may influence the results. In this study, we aimed to examine the decomposability of low- and high-order roots and whether initial moisture status would influence their decomposition. We carried out a one-year litterbag experiment for roots of a subtropical tree species Liquidambar formosana. Roots for the decomposition were divided into low- (1st and 2nd orders) and high-order (3rd and 4th orders) classes, and were dried or kept fresh before being buried into the soil. We found that low-order roots were decomposed slower (half the rate of high-order roots in terms of mass loss), and the content of soluble carbohydrates was the main influencing factor. We also found that drying prior to decomposition facilitated the decomposition of high-order roots during the early stage by 10%. Our study suggests that litter carbon quality, particularly soluble carbohydrate content, is the major driver for root decomposition, and that previous studies using dried root samples might have overestimated short-term root decomposition.
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