Characteristics of root decomposition based on in situ experiments in a tropical rainforest in Sarawak, Malaysia: impacts of root diameter and soil biota

Mizue Ohashi, Naoki Makita, Ayumi Katayama, Tomonori Kume, Kazuho Matsumoto, Tomo’omi Kumagai, Izuki Endo, Lip Khoon Kho

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Aims: Tropical 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 (CO 2 ) efflux in a tropical rainforest in Malaysian Borneo. Methods: We incubated soil chambers with fine and coarse root litterbags at varying soil depths. Soil chambers were covered with nets of different mesh sizes, and CO 2 efflux was monitored from the top of each soil chamber during the incubation. Results: Our 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 CO 2 efflux increased linearly with C loss from root decomposition, indicating that 40% of the CO 2 efflux originates from root litter. Conclusions: The variation in root decomposition rates suggests the possible role of root litter in soil C storage and emission in a tropical rainforest.

Original languageEnglish
Pages (from-to)439-448
Number of pages10
JournalPlant and Soil
Volume436
Issue number1-2
DOIs
Publication statusPublished - Mar 1 2019

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

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