潮滩沉积物-水界面磷、铁的高分辨率分布特征及生物地球化学行为

潘峰; 郭占荣; 刘花台; 王博; 李志伟; 庄振杰

doi:10.3799/dqkx.2018.177

潮滩沉积物-水界面磷、铁的高分辨率分布特征及生物地球化学行为

doi: 10.3799/dqkx.2018.177

1.
厦门大学海洋与地球学院, 福建厦门 361102
2.
厦门大学环境与生态学院, 福建厦门 361102

基金项目:

国家自然科学基金项目 41672226

国家自然科学基金项目 41372242

详细信息

作者简介:
潘峰(1990-), 男, 博士研究生, 研究方向为海岸带水文地质

通讯作者:
郭占荣

中图分类号: P736.4
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出版历程
- 收稿日期: 2018-03-19
- 刊出日期: 2018-11-15

High-Resolution Distribution and Biogeochemical Behavior of Phosphorus and Iron at Sediment-Water Interface of Tidal Flat

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2.
College of the Environment and Ecology, Xiamen University, Xiamen 361102, China

摘要

摘要: 为了解潮间带微环境中磷、铁元素的分布和耦合规律及对磷释放的影响，借助薄膜扩散梯度技术（ZrO-Chelex DGT）原位高分辨率获取九龙江口红树林潮滩孔隙水剖面的溶解活性磷（DRP）、Fe²⁺浓度，并测定沉积物相应的理化参数.研究结果表明：（1）在表层孔隙水中，DRP、Fe²⁺浓度呈现显著的正相关性，证实了磷、铁元素的耦合关系以及沉积物铁氧化物对磷吸附/解吸附的控制作用；（2）在深部还原带，DRP浓度相对Fe²⁺浓度具有较大的波动，主要受到沉积物异质性以及红树植物吸收等的影响；（3）根据表层孔隙水中DRP的浓度梯度计算获得磷的分子扩散通量为0.000 64~0.006 00 μg·cm^-2·d^-1，结果远低于一般湖泊沉积物内源磷的扩散通量，原因是富铁且具较深氧化带的潮滩沉积物中的磷-铁耦合关系有效地抑制了磷的释放.
- 沉积物 /
- 磷 /
- 铁 /
- 生物地球化学 /
- 薄膜扩散梯度技术 /
- 红树林潮滩
Abstract: To find out distribution and coupling pattern of iron and phosphorus, as well as impact on phosphorus release in microenvironment of intertidal region. with the help of diffusive gradients in thin films technique (ZrO-Chelex DGT), we obtained in-situ high-resolution DRP and Fe²⁺ concentrations in porewater profiles of mangrove tidal flat in Jiulong River estuary, as well as the corresponding sediment properties in this study. The results show:(1) In surface porewater, the remarkable positive correlation between DRP and Fe²⁺ verified the coupling relationship of these two elements and the crucial effects of sediment iron (Ⅲ) (oxyhydr) oxides on the absorption/desorption of phosphorus; (2) in deep anoxic porewater, on account of sediment heterogeneity and absorption by mangrove plants, DRP concentrations presented obvious fluctuations compared with Fe²⁺; (3) the molecular diffusion flux was estimated ranging from 0.000 64 to 0.006 00 μg·cm^-2·d^-1 based on DRP concentrations gradient in surface porewater, which are much lower than results of general lake research. The main reason is P-Fe coupling in this iron-rich tidal flat sediment with deep oxidation zone which effectively restrains phosphorus release.
- sediments /
- phosphorus /
- iron /
- biogeochemistry /
- ZrO-Chelex DGT /
- mangrove tidal flat

HTML全文

图 1 研究区位置及低潮时采样点分布

Fig. 1. Sampling sites in the study area of low tide

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图 2 沉积物磷形态垂向分布

Fig. 2. Vertical distributions of P fractions in sediments

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图 3 孔隙水中磷、铁浓度垂直分布

Fig. 3. Vertical distributions of P and Fe concentrations in porewater

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图 4 林缘沉积物柱样剖面

Fig. 4. Profile of sediment core at mangrove edge

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图 5 A、B、C三处不同深度段DRP与Fe²⁺浓度的线性相关

Fig. 5. Linear correlation between DRP and Fe²⁺ concentrations at diverse depth ranges at three stations

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图 6 A、B、C表层5cm深度范围DRP的浓度变化

Fig. 6. Linear correlation between uppermost 5cm depth and DRP concentrations

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表 1 林缘、光滩、水下沉积物理化特征

Table 1. Statistical data of properties in sediments at mangrove edge, bare flat and underwater

深度(cm)	TP(mg/kg)	盐度(g/kg)	θ_g(%)	TFe(g/kg)	TOC(g/kg)	砂(%)	粉砂(%)	粘土(%)
林缘
0~2	781	9.0	47.81	15.29	12.98	3.4	75.3	21.3
2~4	750	8.5	47.52	14.71	13.83	3.8	67.7	28.5
4~6	971	9.5	48.27	16.20	11.71	2.5	72.0	25.5
6~8	856	8.5	48.65	15.71	21.11	3.3	74.3	22.4
8~10	809	9.5	47.24	15.22	18.15	3.9	73.1	23.0
10~15	781	9.0	44.74	15.65	18.74	4.5	66.3	29.2
15~20	581	8.5	42.26	15.57	13.41	4.8	73.1	22.1
20~25	629	8.5	41.77	15.80	17.56	4.9	70.7	24.4
25~30	650	7.5	41.56	15.78	20.35	3.8	74.0	22.2
30~35	676	8.0	43.99	16.35	14.00	1.6	73.0	25.4
平均值	712	8.5	44.30	15.71	16.45	3.9	71.6	24.5
光滩
0~2	886	8.5	48.97	15.91	6.80	18.9	65.2	16.1
2~4	989	6.0	48.29	16.44	8.07	5.4	73.3	21.3
4~6	1 047	7.5	49.73	16.50	7.14	1.3	73.4	25.3
6~8	1 046	8.5	49.47	16.67	5.87	1.4	71.2	27.4
8~10	986	10	47.64	12.85	9.09	2.9	71.5	25.6
10~15	1 035	8.5	47.04	16.07	12.39	2.0	74.0	24.0
15~20	797	7.0	43.93	14.36	8.75	5.8	65.4	28.8
20~25	894	7.0	44.82	15.99	10.95	2.7	73.2	24.1
25~30	570	5.5	39.91	16.37	11.71	1.1	71.1	27.8
30~35	565	6.0	44.80	15.85	15.78	1.5	64.6	33.9
平均值	835	7.2	45.45	15.71	10.62	3.7	70.3	26.0
水下
0~2	1 080	6.0	57.13	15.85	15.78	7.1	70.7	22.2
2~4	859	11.0	50.09	16.19	28.74	7.3	72.4	20.3
4~6	803	7.5	50.23	16.27	26.87	2.3	77.5	20.2
6~8	1 036	7.5	50.90	16.40	22.81	8.9	67.0	24.1
8~10	947	10.0	51.75	15.99	20.10	0.9	75.8	23.3
10~15	1 132	12.0	51.10	16.35	25.43	0.6	78.4	21.0
15~20	935	13.0	49.59	16.44	19.17	1.2	76.6	22.2
20~25	1 044	11.5	47.80	16.19	31.36	3.4	76.5	20.1
25~30	686	10.5	44.62	16.44	24.33	6.5	67.6	25.9
30~35	908	8.0	44.00	16.44	20.01	6.6	70.7	22.7
平均值	942	10.0	48.74	16.31	23.08	4.0	73.8	22.2

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表 2 与湖泊沉积物磷扩散通量的对比

Table 2. Comparison of P diffusion flux with other areas

研究地点	扩散通量(μg·cm^-2·d^-1)	文献来源
九龙江口	0.00064~0.00600	本研究
红枫湖	0.032~0.251	罗婧等，2015
巢湖	0.004~0.079	Han et al., 2015
洪泽湖	0.017~0.079	Yao et al., 2016
洞庭湖	-0.003~0.020	Gao et al., 2016
太湖	-0.021~0.065	Ding et al., 2015

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