Effect of water temperature on internal nitrogen release from sediments in the Pearl River Delta region, China

IF 2.7 4区环境科学与生态学 Q2 Environmental Science

Hydrology Research Pub Date : 2023-08-31 DOI:10.2166/nh.2023.056

Dantong Zhu, Xiangju Cheng, D. Sample, Q. Qiao, Zhaowei Liu

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引用次数: 0

Abstract

Nitrogen (N) has received attention as an indicator of water quality and pollution. However, there is still a lack of systematic research on its influence of temperature. An experiment was conducted with five tanks containing sediments from the Pearl River Delta region of China and distilled water to assess the release of N from sediments under controlled conditions; temperatures from 10 to 30 °C were assessed. Results show that the effect of temperature on N in the water column and sediment is nonlinear. NO3-N was affected at temperatures between 20 and 25 °C in shallow sediments (1–3 cm below the sediment–water interface) with rapid increase concentration, while NH4-N concentration in water column was decreased significantly with increased temperature between 10 and 15 °C. NO3-N was dominant at temperatures from 25 to 30 °C. However, the presence of NH4-N in a water body can inhibit its release, thus the relationship between the diffusive flux with temperature is not linear. The relationship between N diffusive flux at the sediment–water interface was described by Polynomial2D and Lorentz2D models.

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水温对珠江三角洲沉积物内部氮释放的影响

氮(N)作为水质和污染的指标，一直受到人们的关注。然而，对于其受温度的影响，目前还缺乏系统的研究。采用5个装有中国珠江三角洲地区沉积物和蒸馏水的容器，研究了在控制条件下沉积物中N的释放情况;温度范围从10°C到30°C。结果表明，温度对水柱和沉积物中氮的影响是非线性的。在20 ~ 25℃范围内，浅层沉积物(沉积物-水界面以下1 ~ 3 cm)中NO3-N受温度影响，浓度迅速升高，而在10 ~ 15℃范围内，水柱中NH4-N浓度随温度升高而显著降低。在25 ~ 30℃范围内，NO3-N占主导地位。然而，水体中NH4-N的存在会抑制其释放，因此扩散通量与温度之间不是线性关系。用多项式2d和Lorentz2D模型描述了沉积物-水界面N扩散通量的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrology Research Environmental Science-Water Science and Technology

CiteScore

5.30

自引率

7.40%

发文量

审稿时长

17 weeks

期刊介绍： Hydrology Research provides international coverage on all aspects of hydrology in its widest sense, and welcomes the submission of papers from across the subject. While emphasis is placed on studies of the hydrological cycle, the Journal also covers the physics and chemistry of water. Hydrology Research is intended to be a link between basic hydrological research and the practical application of scientific results within the broad field of water management.