Organic carbon stock and composition in 3.5-m core mangrove soils (Trat, Thailand)

Morimaru Kida, Ikumi Watanabe, Kazutoshi Kinjo, Miyuki Kondo, Shinpei Yoshitake, Mitsutoshi Tomotsune, Yasuo Iimura, Suthathip Umnouysin, Vilanee Suchewaboripont, Sasitorn Poungparn, Toshiyuki Ohtsuka, Nobuhide Fujitake*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Mangroves are increasingly recognized as an important component of regional and global carbon cycles especially for their high carbon storage capacity. Global estimation of mangrove soil organic carbon (SOC) storage requires detailed regional studies, but estimates of SOC data in deep soils are currently missing in many countries. Furthermore, little is explored on the molecular composition of mangrove SOC. Here, we assessed the SOC stock in a Trat mangrove forest (Thailand) by collecting deep soils (3.5 m) and analyzed the SOC composition for better understanding its potential sources and influencing factors. The Trat mangrove forest had four times higher SOC stock than has been considered for Thai mangrove forests, with the per-area SOC stock of nearly 1000 Mg C ha–1 which rivals that of Indo-Pacific mangrove forests. The SOC composition analyzed by C/N ratios and spectroscopic techniques differed by tree species and depth. Compositional data principal component analysis revealed that a biological factor (root abundance) had stronger influences than the soil texture (sand versus clay) on the abundance and composition of mangrove SOC. Although surface soil (~1 m) C density was largely controlled by the recent vegetation, deep soil C density reflected other historical processes. This study contributed to a refined estimate of Thailand mangrove SOC stock and revealed that factors influencing SOC abundance and composition differ by tree species and depth.

Original languageEnglish
Article number149682
JournalScience of the Total Environment
Volume801
DOIs
Publication statusPublished - 2021 Dec 20
Externally publishedYes

Keywords

  • Blue carbon
  • Carbon pool
  • Coastal vegetated ecosystem
  • DOM
  • Fluorescence
  • SOM

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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