粤港澳大湾区典型城镇化地区河流氮素的时空分布特征及源解析 Spatiotemporal Characteristics and Sources of River Nitrogen in Typical Urbanized Areas in the Guangdong-Hong Kong-Macao Greater Bay Area期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

粤港澳大湾区典型城镇化地区河流氮素的时空分布特征及源解析

引用本文：	黎曼姿,朱爱萍,王莹,陈建耀,梁作兵,伍祺瑞,田帝,曾港,赵良杰. 粤港澳大湾区典型城镇化地区河流氮素的时空分布特征及源解析[J]. 热带地理, 2022, 42(2): 318-327. DOI: 10.13284/j.cnki.rddl.003441

作者姓名：	黎曼姿朱爱萍王莹陈建耀梁作兵伍祺瑞田帝曾港赵良杰

作者单位：	中山大学地理科学与规划学院,广州510275;安徽师范大学地理与旅游学院,安徽芜湖241002;安徽师范大学地理与旅游学院,安徽芜湖241002;广东省地质环境监测总站,广州510510;中山大学地理科学与规划学院,广州510275;中国地质科学院岩溶地质研究所,广西桂林541004

基金项目：	国家自然科学基金项目(41907179,41961144027);广东省自然资源厅地下水资源调查监测评价项目(0835—210Z22803141)。

摘要：	选取粤港澳大湾区典型城镇化地区广州市的流溪河—西航道—前航道为研究对象,分别于2020年7月和2021年1月开展野外调研采样活动,收集40个地表水水样样品,通过室内分析,利用水化学和同位素（δ¹⁵N- $N O 3 -$ 、δ¹⁸O- $N O 3 -$ 和δ¹⁵N- $N H 4 +$ ）等指标,探讨研究区河流氮素的时空分布特征及其来源,研究城市化对河流氮素的影响。结果表明：从上游到下游,人类活动对Cl^-、 $N H 4 +$ -N、 $N O 3 -$ -N、DIN（溶解态无机氮）的质量浓度影响逐渐突显;丰水期 $N H 4 +$ -N、DIN较枯水期高,主要归因于外源输入的影响强于降雨量与上游来水稀释的综合作用;在溶解态总氮的组成分布上, $N H 4 +$ -N与 $N O 3 -$ -N分别是丰水期、枯水期的主要存在形态,说明丰水期人类活动影响十分显著。丰水期 $N H 4 +$ -N与Cl^-的质量浓度具有较强的正相关关系,说明丰水期 $N H 4 +$ -N与Cl^-可能具有相近或相同的来源。离子比值及稳定同位素的溯源结果具有较高的一致性,均显示上游农田化肥、土壤有机氮、养殖污水为上游河道的主要氮来源,而土壤有机氮、城市污水则为下游河道氮的主要来源。
关键词：	粤港澳大湾区典型城镇化地区流溪河氮素同位素源解析
收稿时间：	2021-03-19
Spatiotemporal Characteristics and Sources of River Nitrogen in Typical Urbanized Areas in the Guangdong-Hong Kong-Macao Greater Bay Area

Li Manzi,Zhu Aiping,Wang Ying,Chen Jianyao,Liang Zuobing,Wu Qirui,Tian Di,Zeng Gang,Zhao Liangjie. Spatiotemporal Characteristics and Sources of River Nitrogen in Typical Urbanized Areas in the Guangdong-Hong Kong-Macao Greater Bay Area[J]. Tropical Geography, 2022, 42(2): 318-327. DOI: 10.13284/j.cnki.rddl.003441

Authors:	Li Manzi Zhu Aiping Wang Ying Chen Jianyao Liang Zuobing Wu Qirui Tian Di Zeng Gang Zhao Liangjie

Affiliation:	1.School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China;2.School of Geography and Tourism, Anhui Normal University, Wuhu 241002, China;3.Guangdong Geological Environment Monitoring Station, Guangzhou 510510, China;4.Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China

Abstract:	A typical urbanized area in the Guangdong-Hong Kong-Macao Greater Bay Area, Liuxi River-West Channel-North Channel in Guangzhou City, was used to reveal the impacts of rapid urbanization on riverine nutrients. Two field campaigns were implemented in both wet and dry season, e.g. July 2020 and January 2021. Forty surface water samples were collected to analyze indicators such as major ions and stable isotopes (δ¹⁵N- $N O 3 -$ , δ¹⁸O- $N O 3 -$ and δ¹⁵N- $N H 4 +$ ) The spatiotemporal characteristics and sources of river nitrogen in the study area were explored by using hydrochemistry and isotopes (δ¹⁵N- $N O 3 -$ , δ¹⁸O- $N O 3 -$ and δ¹⁵N- $N H 4 +$ ) methods. The results show that from upstream to downstream, the influences of human activties on the mass concentrations of Cl^-, $N H 4 +$ -N, $N O 3 -$ -N, DIN (Dissolved Inorganic Nitrogen) are gradually prominent. The concentrations of $N H 4 +$ -N and DIN in the wet season are higher than those in the dry season, mainly due to the the more intensive influence of exogenous input than the combined effect of rainfall and upstream water dilution. In the composition distribution of dissolved total nitrogen, $N H 4 +$ -N and $N O 3 -$ -N are the main forms in the wet and dry season respectively, indicating significant impact of human activities in the wet season. There is a strong positive correlation between $N H 4 +$ -N and Cl^- concentration in the wet season, indicating that $N H 4 +$ -N and Cl^- may have similar or the same sources in the wet season. Results of ion ratio of Na/Cl and stable isotope tracing are highly consistent. This indicates that upstream farmland chemical fertilizer, soil organic nitrogen and aquaculture sewage are the main sources of nitrogen in the upstream, while the soil organic nitrogen and urban sewage are the main sources of nitrogen in the downstream. The research results can provide data support and theoretical basis for river water environment protection and water resources management in the study area.

Keywords:	Guangdong-Hong Kong-Macao Greater Bay Area typical urbanization area Liuxi River Nitrogen isotope trace source identification
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