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大学・研究所にある論文を検索できる 「Organic matter degradation characteristics of coastal marine sediments collected from the Seto Inland Sea, Japan」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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Organic matter degradation characteristics of coastal marine sediments collected from the Seto Inland Sea, Japan

Asaoka, Satoshi Jadoon, Waqar Azeem Umehara, Akira Takeda, Kazuhiko Otani, Sosuke Ohno, Masaki Fujitake, Nobuhide Sakugawa, Hiroshi Okamura, Hideo 神戸大学

2020.09.10

概要

Organic matter in marine sediment is mainly categorized into three fractions depending on degradability: labile, semi labile and refractory. The degradability of coastal marine sediments depends on the properties of the organic matter contained in the sediments. The purpose of this study was to quantify labile and refractory organic matter in coastal marine sediments with different characteristics collected from the Seto Inland Sea, and to discover the factors controlling the degradability of organic matter. Refractory organic matter content in sediments ranged from 4.7–21.4 mg g−1, a percent composition equivalent to 72–97% of TOC. In contrast, labile and semi-labile content were 0.1–1.4 mg g−1 and 0.1–2.3 mg g−1, respectively, a percent composition equivalent to 0.5–12.9% and 1.8–17.1% of TOC, respectively. Approximately 93% of refractory organic matter was categorized into humin. Organic matter originated from marine phytoplankton settled on the surface of sediments and changed to humin or a refractory organic matter. This study contributes to a better understanding of the organic matter degradation characteristics of coastal marine sediments and provides important parameters for estimating carbon budget and carbon cycling in coastal sea systems.

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参考文献

UV-Humic like

<240

406

Stedmon 2003

UV-Humic

265

495

Coble 1998

UV-Humic

255

400-460

Coble 1998

Tyrosine-like, protein-like

250

307

Yamashita 2003

UV-Humic

245

467

Coble 1998

Tryptophan-like, protein-like

275

337

Yamashita 2003

TOC of humic, fulvic and humin (mg g-1)

25

●：Sum of humic acid, fulvic acid

and humin or humin after 90 days

(Y=1.08X, r=0.991)

■：Humin after 90 days

(Y=0.932X, r=0.988)

20

15

10

10

15

20

25

TOC of refractory organic matter (mg g-1)

Fig. S1 Correlations of between sum of humic acid, fulvic acid and

humin after 90 days and refractory organic matter.

18

St. A-1

St. A-2

St. HI-1

St. B-1

St. K-1

15

12

DOC concentration (mg L-1)

DOC concentration (mg L-1)

18

St. HA-1

St. HA-2

St. O-1

St. O-2

St. O-3

15

12

20

40

60

80

100

20

Time (day)

Fig. S2 Time course of DOC concentration in overlying water

Error bars are standard deviation (n=3)

40

60

Time (day)

80

100

St. A-1 (5 days)

St. A-1 (90 days)

RU

St. A-2 (90 days)

St. HI-1 (5 days)

St. HI-1 (90 days)

Excitation (nm)

St. A-2 (5 days)

Fig. S3 EEM of overlying water at 5 and 90 days at Sts. A-1, A-2 and HI-1

St. B-1 (5 days)

St. B-1 (90 days)

RU

St. HA-1 (90 days)

St. HI-2 (90 days)

Excitaion (nm)

St. HI-2 (5 days)

0.25

Excitaion (nm)

Excitation (nm)

St. HA-1 (5 days)

Fig. S3 EEM of overlying water at 5 and 90 days at Sts. B-1, HA-1 and HA-2

St. O-1 (90 days)

Excitaion (nm)

Excitation (nm)

St. O-1 (5 days)

RU

St. O-2 (90 days)

Excitation (nm)

Excitation (nm)

St. O-2 (5 days)

St. O-3 (90 days)

Excitation (nm)

St. O-3 (5 days)

Fig. S3 EEM of overlying water at 5 and 90 days at Sts. O-1, O-2 and O-3

RU

St. K-1 (5 days)

St. K-1 (90 days)

Fig. S3 EEM of overlying water both 5 and 90 days at Sts. K-1

3.0

SUVA (254 nm )

5 days

90 days

2.0

1.0

0.0

A-1

A-2

HI-1

B-1 HA-1 HA-2

Sampling Stations

Fig. S4 SUVA of overlying water

O-1

O-2

O-3

K-1

1.0

5 days

90 days

HIX

0.8

0.6

0.4

0.2

0.0

A-1

A-2

HI-1

B-1 HA-1 HA-2

Sampling Stations

O-1

O-2

O-3

Fig. S5 The humification index of overlying water

K-1

...

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