液化条件下沉积物中氮、磷的释放规律

doi:10.13634/j.cnki.mes20160208

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摘要湖泊、海岸沉积物中的氮(N)、磷(P)等营养物质可以通过静态扩散或沉积物再悬浮向水体中释放。沉积物再悬浮过程中N、P的释放量可能大于静态扩散的释放量,特别是沉积物液化时再悬浮过程会对水体中N、P浓度产生重要影响。本文利用波浪水槽试验,研究了沉积层中的N、P在静置固结阶段(I)、加波未液化阶段(Ⅱ)、加波液化阶段(Ⅲ)中的释放规律。试验结果表明:阶段I水中的总磷(TP)、溶解性总磷(TDP)、总氮(TN)、溶解性总氮(TDN)浓度最低。阶段Ⅱ水中TP比阶段I提高了数倍,阶段Ⅱ水中TDP浓度比阶段I平均仅提高了0.2倍;阶段Ⅲ水中TP和TDP比阶段I分别提高可达59倍和25倍。阶段Ⅱ和Ⅲ水中TN、TDN均比阶段I提高了数倍。

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	孙振红
	许国辉
	游启
	房虹汝

关键词：液化氮磷水槽试验沉积物

Abstract：Sediments in lakes and coasts can release N and P into the overlying water due to static diffusion or resuspension, the value of which may be higher than that of static diffusion.Moreover, the resuspension under sediment liquefaction may have important impact on the concentration of N and P in water.In this paper, flume experiments were carried out to study the release of N and P at phase of consolidation(I), non-liquefaction(Ⅱ), and liquefaction phase(Ⅲ).The results showed that the concentrations of total phosphorus(TP), total dissolved phosphorus(TDP), total nitrogen(TN) and total dissolved nitrogen(TDN) were lowest at phase I, the concentration of TP at phase Ⅱ increased several times than those at phase I, the concentration of TDP at phase Ⅱ meanly increased by only 0.2 times than those at phase I; the concentration of TP and TDP increased most(up to 59 times and 25 times, respectively) at phase Ⅲ with 14 cm wave height.The concentration of TN and TDN at both phase Ⅱ and Ⅲ increased several times than those of phase I.

Key words： liquefaction nitrogen phosphorus fume experiment sediment

收稿日期: 2014-10-30;

PACS:

基金资助:

国家自然科学基金(41076021)

通讯作者: 许国辉(1972-),男,教授,博士,研究方向为海洋工程地质、海岸工程环境,E-mail:xuguohui@ouc.edu.cn E-mail: xuguohui@ouc.edu.cn

作者简介:孙振红(1990-),女,山东聊城人,硕士研究生,E-mail:zhenhong_sun@163.com

引用本文:

孙振红,许国辉,游启等. 液化条件下沉积物中氮、磷的释放规律[J]. 海洋环境科学, 2016, 35(2): 203-208.

SUN Zhen-hong,XU Guo-hui,YOU Qi et al. Release of nitrogen and phosphorus from sediment under liquefaction[J]. Marine Environmental Science, 2016, 35(2): 203-208.

链接本文:

http://hyhjkx.nmemc.org.cn/CN/10.13634/j.cnki.mes20160208 或 http://hyhjkx.nmemc.org.cn/CN/Y2016/V35/I2/203

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