冰封期湖泊沉积物-水界面氮磷迁移及源汇特征

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摘要以查干湖为研究对象,基于原位-高分辨率被动采样技术(DGT),分析关键营养元素(N和P)亚毫米级空间分布规律及其源汇特征.结果表明,冰封期上覆水中有效态NH₄⁺-N和NO₃^--N浓度大于沉积物中浓度,而有效态P则呈现相反的趋势.在沉积物-水界面下有效态氮磷表现出不同的分布特征, NH₄⁺-N和NO₃^--N浓度随着沉积物深度的增加而逐渐减小,P浓度随着沉积物深度的增加呈先增大后减小的趋势.查干湖NH₄⁺-N和NO₃^--N交换通量均值分别-0.135, -0.333mg/(m²·d ),呈现“汇”的特征;而P交换通量均值为0.084mg/(m²·d),呈现“源”的特征.冗余分析(RDA)表明,溶解氧解释了沉积物-水界面氮磷释放通量的32.8%(P<0.05).通过对上覆水贡献率估算发现沉积物中P营养盐扩散对上覆水影响较大,个别采样点达到2297%的贡献率,这可能是由于局部微高值点的存在.

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	朱胤泽
	赵可
	董向前
	张镜晗
	王琪琛
	王潆雪
	田雪
	袁宇翔
	朱晓艳

关键词 ：查干湖, 冰封期, 沉积物-水界面, 薄膜梯度扩散, 交换通量, 溶解氧

Abstract：Based on the in-situ high-resolution Diffusive Gradients in Thin-films (DGT), the study aimed at analyzing the spatial distribution of key nutrient elements (N and P) at the submillimeter scale and their source & sink characteristics. Our findings indicate that the concentrations of DGT-NH₄⁺-N and NO₃^--N in overlying water were higher than those in sediments during frozen period, whereas liable P demonstrated a contrasting trend. Under the sediment-water interface, liable N and P showed different distribution characteristics. The concentrations of NH₄⁺-N and NO₃^--N gradually decreased with the increase of sediment depth, and P concentration firstly increased and then decreased with the increased sediment depth. The average exchange fluxes of NH₄⁺-N and NO₃^--N in Chagan Lake were -0.135 and -0.333mg/(m²·d) respectively, showing the features of “Sink”; the average exchange fluxes of P was 0.084mg/(m²·d), showing the features of “Source”. Redundancy Analysis (RDA) showed that dissolved oxygen explained 32.8% of nitrogen and phosphorus release fluxes at sediment-water interface (P<0.05). Through estimating the contribution rate of overlying water, we found that the diffusion of P nutrients in sediment played a great role on the overlying water, and the contribution rate of individual sampling points reached 2,297%, possibly due to the presence of local micro-niches.

Key words： Chagan Lake frozen period sediment-water interface diffusive gradients in thin-films diffusive flux dissolved oxygen

收稿日期: 2022-11-25

PACS:

X524

基金资助:国家自然科学基金资助项目(42271129);吉林省自然科学基金资助项目(YDZJ202201ZYTS480);吉林省科技厅中青年科技创新创业卓越人才(团队)项目(20220508116RC)

通讯作者: 朱晓艳,副研究员,zhuxy0613@126.com E-mail: zhuxy0613@126.com

作者简介: 朱胤泽(1997-),男,吉林大安人,吉林建筑大学硕士研究生,主要从事沉积物-水界面环境地球化学过程研究.发表论文3篇.5465064782@qq.com

引用本文:

朱胤泽, 赵可, 董向前, 张镜晗, 王琪琛, 王潆雪, 田雪, 袁宇翔, 朱晓艳. 冰封期湖泊沉积物-水界面氮磷迁移及源汇特征[J]. 中国环境科学, 2023, 43(7): 3616-3624. ZHU Yin-ze, ZHAO Ke, DONG Xiang-qian, ZHANG Jing-han, WANG Qi-chen, WANG Ying-xue, TIAN Xue, YUAN Yu-xiang, ZHU Xiao-yan. Characterizing Nitrogen and Phosphorus Transport and Source-Sink Interactions at the Lake Sediment-Water Interface During the Freezing Period. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3616-3624.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I7/3616

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