Characteristics of root decomposition based on in situ experiments in a tropical rainforest in Sarawak, Malaysia: impacts of root diameter and soil biota
Characteristics of root decomposition based on in situ experiments in a tropical rainforest in Sarawak, Malaysia: impacts of root diameter and soil biota
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DOI：
10.1007/s11104-018-03929-3
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发表时间：
2019-03
期刊：
影响因子：
4.9
通讯作者：
M. Ohashi;N. Makita;Ayumi Katayama;T. Kume;Kazuho Matsumoto;T. Kumagai;I. Endo;L. Kho
中科院分区：
文献类型：
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作者：
M. Ohashi;N. Makita;Ayumi Katayama;T. Kume;Kazuho Matsumoto;T. Kumagai;I. Endo;L. Kho
目标热带森林对全球碳（C）平衡的稳定做出了重大贡献；然而，人们对热带雨林根凋落物分解知之甚少。在这项研究中，我们的目的是（1）表征土壤深度、根系直径和土壤生物对根凋落物分解的影响，以及（2）估计根系分解对马来西亚婆罗洲热带雨林土壤二氧化碳（CO2）流出的贡献。方法我们在不同土壤深度培养装有细根和粗根凋落物袋的土室。土壤室覆盖有不同目数的网，在培养过程中从每个土壤室的顶部监测CO2流出。结果我们的结果表明，粗根比细根分解得更快。土壤深度没有影响，但从实验开始后398天起，土壤动物和真菌对粗根分解有显着影响。土壤CO2流出量随着根系分解造成的碳损失呈线性增加，表明40%的CO2流出量来自根凋落物。结论根系分解速率的变化表明根凋落物在热带雨林土壤碳储存和排放中可能发挥作用。
AimsTropical forests contribute significantly to the stability of global carbon (C) balance; however, little is known about root litter decomposition in tropical rainforests. In this study, we aimed to (1) characterise the effect of soil depth, root diameter and soil organisms on root litter decomposition and (2) estimate the contribution of root decomposition to soil carbon dioxide (CO2) efflux in a tropical rainforest in Malaysian Borneo.MethodsWe incubated soil chambers with fine and coarse root litterbags at varying soil depths. Soil chambers were covered with nets of different mesh sizes, and CO2efflux was monitored from the top of each soil chamber during the incubation.ResultsOur results showed that coarse roots decomposed faster than fine roots. There was no impact of soil depth, but soil animals and fungi had a significant impact on coarse root decomposition from 398 days after the start of the experiment. Soil CO2efflux increased linearly with C loss from root decomposition, indicating that 40% of the CO2efflux originates from root litter.ConclusionsThe variation in root decomposition rates suggests the possible role of root litter in soil C storage and emission in a tropical rainforest.