Changes in dissolved organic matter composition and dynamics in a subtropical mangrove river driven by rainfall

Morimaru Kida, Mai Tanabe, Mitsutoshi Tomotsune, Shimpei Yoshitake, Kazutoshi Kinjo, Toshiyuki Ohtsuka, Nobuhide Fujitake

研究成果: Article

1 引用 (Scopus)

抄録

Dissolved organic matter (DOM) plays an important role in sustaining ecosystem services of mangrove forests through well-described biogeochemical and ecological functions. This study was conducted in the Fukido River (Ishigaki Island, Japan) to better understand the seasonal and episodic changes in DOM concentration and composition in a subtropical mangrove system. Water samples were collected seasonally along a headwater–mangrove–sea transect on 10 occasions from September 2014 through June 2016. DOM was fractionated based on hydrophobicity into two fractions (hydrophobic and hydrophilic) and also analyzed by excitation-emission matrix spectroscopy combined with parallel factor analysis (PARAFAC). Although seasonal changes in DOM concentration and composition were not observed, both hydrophobic and hydrophilic DOM concentrations and levels of the identified three PARAFAC components clearly increased during a typhoon event. It is suggested that episodic increases in freshwater input due to a typhoon caused enhanced leaching of DOM from mangrove litter and dissolution of mangrove soil organic matter (SOM), which was otherwise retained in the mangrove soil by salinity-induced aggregation. The aggregation–dissolution properties of SOM are crucial in determining the magnitude of DOM outwelling and possibly SOM accumulation rate by enhancing advective DOM exchanges. Future studies are needed to evaluate the size of the carbon pool and outwelling of DOM after classifying mangrove forests based on the hydrological regime that influences biogeochemical conditions in the forests. Regional Index Terms: Japan, Okinawa, Ishigaki, Fukido.

元の言語English
ページ(範囲)6-17
ページ数12
ジャーナルEstuarine, Coastal and Shelf Science
223
DOI
出版物ステータスPublished - 2019 7 31
外部発表Yes

Fingerprint

dissolved organic matter
mangrove
rain
rainfall
rivers
river
mangrove soils
soil organic matter
mangrove forests
typhoon
factor analysis
Japan
freshwater input
hydrological regime
ecological function
Ryukyu Archipelago
hydrophobicity
carbon sinks
accumulation rate
ecosystem service

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

これを引用

Changes in dissolved organic matter composition and dynamics in a subtropical mangrove river driven by rainfall. / Kida, Morimaru; Tanabe, Mai; Tomotsune, Mitsutoshi; Yoshitake, Shimpei; Kinjo, Kazutoshi; Ohtsuka, Toshiyuki; Fujitake, Nobuhide.

:: Estuarine, Coastal and Shelf Science, 巻 223, 31.07.2019, p. 6-17.

研究成果: Article

@article{b6e5fbffcf2c4200ad23df5c1a47c028,
title = "Changes in dissolved organic matter composition and dynamics in a subtropical mangrove river driven by rainfall",
abstract = "Dissolved organic matter (DOM) plays an important role in sustaining ecosystem services of mangrove forests through well-described biogeochemical and ecological functions. This study was conducted in the Fukido River (Ishigaki Island, Japan) to better understand the seasonal and episodic changes in DOM concentration and composition in a subtropical mangrove system. Water samples were collected seasonally along a headwater–mangrove–sea transect on 10 occasions from September 2014 through June 2016. DOM was fractionated based on hydrophobicity into two fractions (hydrophobic and hydrophilic) and also analyzed by excitation-emission matrix spectroscopy combined with parallel factor analysis (PARAFAC). Although seasonal changes in DOM concentration and composition were not observed, both hydrophobic and hydrophilic DOM concentrations and levels of the identified three PARAFAC components clearly increased during a typhoon event. It is suggested that episodic increases in freshwater input due to a typhoon caused enhanced leaching of DOM from mangrove litter and dissolution of mangrove soil organic matter (SOM), which was otherwise retained in the mangrove soil by salinity-induced aggregation. The aggregation–dissolution properties of SOM are crucial in determining the magnitude of DOM outwelling and possibly SOM accumulation rate by enhancing advective DOM exchanges. Future studies are needed to evaluate the size of the carbon pool and outwelling of DOM after classifying mangrove forests based on the hydrological regime that influences biogeochemical conditions in the forests. Regional Index Terms: Japan, Okinawa, Ishigaki, Fukido.",
keywords = "Aggregation, Blue carbon, Dissolution, DOM, Hydrological regime, SOM",
author = "Morimaru Kida and Mai Tanabe and Mitsutoshi Tomotsune and Shimpei Yoshitake and Kazutoshi Kinjo and Toshiyuki Ohtsuka and Nobuhide Fujitake",
year = "2019",
month = "7",
day = "31",
doi = "10.1016/j.ecss.2019.04.029",
language = "English",
volume = "223",
pages = "6--17",
journal = "Estuarine, Coastal and Shelf Science",
issn = "0272-7714",
publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Changes in dissolved organic matter composition and dynamics in a subtropical mangrove river driven by rainfall

AU - Kida, Morimaru

AU - Tanabe, Mai

AU - Tomotsune, Mitsutoshi

AU - Yoshitake, Shimpei

AU - Kinjo, Kazutoshi

AU - Ohtsuka, Toshiyuki

AU - Fujitake, Nobuhide

PY - 2019/7/31

Y1 - 2019/7/31

N2 - Dissolved organic matter (DOM) plays an important role in sustaining ecosystem services of mangrove forests through well-described biogeochemical and ecological functions. This study was conducted in the Fukido River (Ishigaki Island, Japan) to better understand the seasonal and episodic changes in DOM concentration and composition in a subtropical mangrove system. Water samples were collected seasonally along a headwater–mangrove–sea transect on 10 occasions from September 2014 through June 2016. DOM was fractionated based on hydrophobicity into two fractions (hydrophobic and hydrophilic) and also analyzed by excitation-emission matrix spectroscopy combined with parallel factor analysis (PARAFAC). Although seasonal changes in DOM concentration and composition were not observed, both hydrophobic and hydrophilic DOM concentrations and levels of the identified three PARAFAC components clearly increased during a typhoon event. It is suggested that episodic increases in freshwater input due to a typhoon caused enhanced leaching of DOM from mangrove litter and dissolution of mangrove soil organic matter (SOM), which was otherwise retained in the mangrove soil by salinity-induced aggregation. The aggregation–dissolution properties of SOM are crucial in determining the magnitude of DOM outwelling and possibly SOM accumulation rate by enhancing advective DOM exchanges. Future studies are needed to evaluate the size of the carbon pool and outwelling of DOM after classifying mangrove forests based on the hydrological regime that influences biogeochemical conditions in the forests. Regional Index Terms: Japan, Okinawa, Ishigaki, Fukido.

AB - Dissolved organic matter (DOM) plays an important role in sustaining ecosystem services of mangrove forests through well-described biogeochemical and ecological functions. This study was conducted in the Fukido River (Ishigaki Island, Japan) to better understand the seasonal and episodic changes in DOM concentration and composition in a subtropical mangrove system. Water samples were collected seasonally along a headwater–mangrove–sea transect on 10 occasions from September 2014 through June 2016. DOM was fractionated based on hydrophobicity into two fractions (hydrophobic and hydrophilic) and also analyzed by excitation-emission matrix spectroscopy combined with parallel factor analysis (PARAFAC). Although seasonal changes in DOM concentration and composition were not observed, both hydrophobic and hydrophilic DOM concentrations and levels of the identified three PARAFAC components clearly increased during a typhoon event. It is suggested that episodic increases in freshwater input due to a typhoon caused enhanced leaching of DOM from mangrove litter and dissolution of mangrove soil organic matter (SOM), which was otherwise retained in the mangrove soil by salinity-induced aggregation. The aggregation–dissolution properties of SOM are crucial in determining the magnitude of DOM outwelling and possibly SOM accumulation rate by enhancing advective DOM exchanges. Future studies are needed to evaluate the size of the carbon pool and outwelling of DOM after classifying mangrove forests based on the hydrological regime that influences biogeochemical conditions in the forests. Regional Index Terms: Japan, Okinawa, Ishigaki, Fukido.

KW - Aggregation

KW - Blue carbon

KW - Dissolution

KW - DOM

KW - Hydrological regime

KW - SOM

UR - http://www.scopus.com/inward/record.url?scp=85064627546&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064627546&partnerID=8YFLogxK

U2 - 10.1016/j.ecss.2019.04.029

DO - 10.1016/j.ecss.2019.04.029

M3 - Article

VL - 223

SP - 6

EP - 17

JO - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

SN - 0272-7714

ER -