珠江口沉积物有机质特征、来源及其对碳存储的意义

doi:10.11978/2021142

Abstract

Abstract:

Estuarine sediment, as an important carrier of terrestrial and marine ecosystems, is one of the main forms of organic matter occurrence. In this study, we analyzed total organic carbon (TOC) concentration, total nitrogen (TN) concentration, soluble organic matter excitation emission matrix spectroscopy (EEMs), spatial differences and influencing factors in different areas. Carbon stable isotope (δ¹³C) was applied to estimate the contribution of sediment organic matter (SOM) in different regions of the Pearl River Estuary (PRE). The results are as follows. (1) Spatial variations of TOC and TN concentrations are similar. The concentrations of SOM in the inner estuary and mixed areas are significantly higher than those in the estuary mouth. Principal component analysis results show that SOM concentrations in the inner estuary and the mixed area are mainly affected by river flow input, and those in the estuary mouth, by ferric iron. (2) MixSIAR results show that SOM in the inner estuary and the mixed zone is still mainly from terrestrial sources, and that in the estuary mouth is primarily from marine sources. (3) Newly produced organic matter in the sediments, which can be quickly utilized, is highly enriched in the PRE. Terrestrial input induced the higher humification degree of SOM in the inner estuary and mixed areas, which is conducive to organic carbon storage processes. In contrast, low storage capability was implicated in the estuary mouth, due to the influence of marine sources and iron oxide-organic matter complex. This makes it unfavorable for the storage of organic carbon in the PRE. This study provides a supplementary reference for further understanding the biogeochemical process of SOM and carbon storage in estuaries.

Key words: Sediment organic matter, terrestrial input, fluorescence characteristics, organic carbon storage, Pearl River Estuary

CLC Number:

P736.41

SHANG Bowen, WU Yunchao, JIANG Zhijian, LIU Songlin, HUANG Xiaoping. Characteristics and sources of organic matter in sediments of the Pearl River Estuary: Carbon storage implications[J].Journal of Tropical Oceanography, 2022, 41(3): 16-28.

Figures/Tables 10

Fig. 1

Tab. 1

Environmental parameters of sediment and bottom water in the PRE"

区域	站位	深度/m		Mz/Φ		粉砂/%		黏土/%		Eh/mV		盐度/‰		DO/(mg·L^-1)
区域	站位	夏季	冬季	夏季	冬季	夏季	冬季	夏季	冬季	夏季	冬季	夏季	冬季	夏季	冬季
口内区	S1		14.0		7.1		62.0		29.7		-167		20.4		6.92
	S2	12.0	12.0	7.5	7.2	63.5	65.5	35.6	32.3	-230	-181	15.8	21.1	4.86	7.03
	S3	7.8	5.7	7.3	6.7	67.3	63.7	32.1	28.2	-233	-109	8.7	24.4	7.15	7.52
	S6	4.0	4.4	7.2	7.5	64.9	63.0	32.4	36.4	-203	-158	9.8	19.8	4.10	8.19
	平均	9.2±4.1		7.2±0.3		64.0±1.8		32.0±2.9		-188±44		17.6±6.0		6.54±1.48
混合区	S4	4.5	14.4	6.8	7.4	51.5	64.7	33.1	34.4	-155	-181	19.9	30.3	7.90	7.62
	S5	7.0	9.0	7.4	6.9	57.0	59.4	37.8	31.3	-126	-165	16.2	28.2	3.80	7.59
	S7	6.6	6.9	5.8	6.7	45.7	64.2	22.0	28.1	-155	-188	26.8	30.9	5.70	7.81
	S8	6.9	6.9	6.0	6.4	48.0	58.1	24.7	26.5	-158	-142	29.3	31.8	7.29	7.68
	S9	5.4	5.5	7.1	7.2	65.4	63.6	31.7	33.6	-170	-140	16.2	26.6	5.30	7.93
	S10	13.5	15.0	6.4	6.2	61.6	60.3	24.9	23.8	-240	-145	32.2	32.1	5.84	7.28
	S11	7.4	6.5	6.8	7.0	66.0	67.1	27.6	29.7	-195	-170	30.4	26.7	5.70	8.07
	S12	8.4	6.3	6.7	6.4	63.8	67.5	27.4	23.4	-190	-131	31.5	26.9	6.80	7.45
	平均	8.1±3.2		6.7±0.5		60.2±6.7		28.7±4.6		-165±29		27.3±5.3		6.86±1.23
口外区	S13	23.0	30.0	5.8	5.5	45.7	41.5	24.0	22.0	-188	-145	33.9	32.4	4.40	7.25
	S14	27.0	24.6	6.9	7.0	68.2	67.7	27.4	27.6	-130	-172	34.0	32.3	5.50	7.30
	S15	29.4	23.5	6.3	5.9	59.7	54.2	23.6	22.5	-121	-125	34.0	32.2	5.60	7.24
	S16	29.6	29.0	5.9	4.9	55.7	37.4	23.0	17.0	-177	-132	33.9	32.4	5.70	7.06
	S17	32.5	33.0	5.1	5.6	39.3	46.3	18.2	22.0	-134	-119	34.0	33.4	5.80	6.90
	S18	38.0	40.0	6.7	7.0	68.1	69.4	25.2	28.4	-144	-107	34.3	33.4	5.60	6.90
	S19	41.8	41.0	6.2	5.8	58.7	56.5	22.9	20.9	-116	-121	34.4	33.6	5.98	6.76
	S20	37.0	33.0	5.4	4.5	50.1	35.5	21.0	15.2	-180	-179	34.4	33.9	6.22	6.77
	平均	32.1±6.1		5.9±0.7		53.4±11.6		22.6±8.7		-143±27		33.5±0.8		5.86±0.84

Tab. 1

Tab. 2

Fig. 2

Fig. 3

Fig. 4

Tab. 3

Tab. 4

Fig. 5

Fig. 6

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	季节		口内区	混合区	口外区
荧光强度	夏季	A峰	135.9±35.6^a	98.3±14.8^b	73.7±17.7^c
		C峰	139.9±21.9^a	86.3±12.4^b	68.9±16.2^c
		M峰	234.7±25.7^a	152.9±21.5^b	128.6±26.9^b
		B峰	14.1±2.6	11.7±1.8	12.2±2.8
		T峰	49.2±4.7^a	37.5±3.3^b	34.5±8.4^b
	冬季	A峰	113.2±20.5^a	80.0±19.7^b	64.3±26.4^b
		C峰	90.2±15.9^a	60.0±16.7^b	50.6±21.2^b
		M峰	155.8±15.3^a	104.5±27.9^b	94.0±35.8^b
		B峰	25.6±14.1	21.4±8.9	14.6±4.0
		T峰	49.3±14.6	39.9±7.6	37.5±11.1
荧光参数	夏季	FI	2.14±0.07^a	2.24±0.07^b	2.40±0.07^c
		β:α	0.79±0.02^a	0.87±0.04^b	1.15±0.04^c
		BIX	0.84±0.11^a	0.94±0.05^b	1.29±0.05^c
		HIX	0.66±0.05^a	0.62±0.03^ab	0.58±0.07^b
	冬季	FI	2.22±0.08^a	2.30±0.10^ab	2.39±0.08^b
		β:α	0.86±0.05^a	0.87±0.06^a	1.03±0.10^b
		BIX	0.93±0.07^a	0.94±0.07^a	1.13±0.11^b
		HIX	0.60±0.07	0.54±0.05	0.52±0.06

季节		Fe³⁺	A峰	C峰	M峰	B峰	T峰	TOC
夏季	Fe³⁺	1
	A峰	-0.505^*	1
	C峰	-0.471^*	-0.987^**	1
	M峰	-0.460^*	0.973^**	0.996^**	1
	B峰	-0.012	0.119	0.142	0.147	1
	T峰	-0.361	0.831^**	0.850^**	0.864^**	0.459^*	1
	TOC	-0.224	0.701^**	0.687^**	0.685^**	0.128	0.627^**	1
冬季	Fe³⁺	1
	A峰	-0.475^*	1
	C峰	-0.489^*	0.986^**	1
	M峰	-0.431	0.970^**	0.974^**	1
	B峰	-0.593^**	0.400	0.427	0.465^*	1
	T峰	-0.578^**	0.715^**	0.720^**	0.760^**	0.743^**	1
	TOC	-0.734^**	0.616^**	0.602^**	0.539^*	0.450^*	0.505^*	1

Characteristics and sources of organic matter in sediments of the Pearl River Estuary: Carbon storage implications

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