城镇化影响东江流域活性氮周转演变的同位素证据

摘要
图/表
参考文献
相关文章 (13)

全文: PDF (3213 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要选择东江流域为研究区,对比不同下垫面影响下河流不同形态氮浓度和氮同位素,探究城镇化发展对流域氮周转的影响并提供实测证据.结果发现,相比其他下垫面影响下的河流,东江流域城镇化河流氮浓度和同位素值呈现不同特征.首先,城镇河流氮浓度高,并且氮以硝酸盐氮为主;其次,同位素分馏效应和瑞利分馏模型估算表明,城镇化发展增强了河道内硝化能力,并且平均约25.8%的硝酸盐氮来自河道内硝化周转;此外城镇河流记录了ln (NO₃^--N)与δ¹⁵N-NO₃^-之间的正相关关系,且枯、丰水期Δδ¹⁵N与Δδ¹⁸O的比值为-2和-6,表明城镇化河流反硝化能力弱,这为抵抗反硝化作用造成硝酸盐积累的现象提供了同位素证据;同时城镇化河流中δ¹⁵N-PN与δ¹⁵N-NH₄⁺的相关性较弱,以及硝酸盐氮同化作用中¹⁵N富集因子与理论值存在差异,证明同化吸收氨氮和硝酸盐氮的作用也不显著.最后,城镇化造成河流活性氮输入途径增多、氮汇过程减少,成为东江流域下游氮浓度升高的关键机制.

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	温婧
	黄邦杰
	房怀阳
	谭秀琴
	吴称龙
	黄志伟
	张宗尧
	林澍
	杜宏伟

关键词 ：城市化河流, 氮负荷, 氮周转, 氮同位素

Abstract：The Dongjiang River Basin was chosen as the study area to compare the nitrogen concentrations and isotopes in the river with different land uses, so as to provide a better understanding and evidence for impacts of urbanization on active nitrogen turnover. In this study, the distinct characteristics of nitrogen concentrations and isotopes were found in urbanized rivers compared to rivers with other land uses. Firstly, the nitrogen concentrations in urbanized rivers were gradually increased due to urbanization and nitrate has become a main nitrogen speciation. Secondly, based on the isotope Rayleigh fractionation model, it was found that the nitrification potential in urbanized river channels was enhanced and about 25.8% of nitrate nitrogen came from nitrification in situ. In addition, a positive correlation between ln(NO₃^--N) and δ¹⁵N-NO₃^- was recorded in urbanized rivers. Moreover, Δδ¹⁵N/Δδ¹⁸O in the dry and wet seasons were –2 and -6, respectively, indicating that the denitrification potential was weakened to provide evidence for nitrate accumulation in urbanized river channels. Likewise, a weak correlation between δ¹⁵N-PN and δ¹⁵N-NH⁴⁺ was also recorded in urbanized rivers, and the ¹⁵N enrichment factor of nitrate assimilation also differed from the theoretical value, indicating a weak assimilation of ammonia and nitrate nitrogen. Finally, more input pathways and less sink processes of nitrogen in urbanized rivers have become a key mechanism for elevated riverine nitrogen concentrations in the lower reaches of Dongjiang river.

Key words： the urbanized river nitrogen load nitrogen transformation nitrogen isotope

收稿日期: 2024-10-28

PACS:

X522

基金资助:国家自然科学基金青年项目(42407127);广东省自然科学基金(2023A1515110110);广州市科技计划项目(2023A04J0950);广东省重点领域研发计划项目(2020B1111350001);广东省科技计划项目(2024B1212040001)

作者简介: 温婧(1988-),女,甘肃天水人,助理研究员,博士,主要从事流域水文地球化学和同位素示踪技术研究,发表论文10余篇.wenjing@scies.org.

引用本文:

温婧, 黄邦杰, 房怀阳, 谭秀琴, 吴称龙, 黄志伟, 张宗尧, 林澍, 杜宏伟. 城镇化影响东江流域活性氮周转演变的同位素证据[J]. 中国环境科学, 2025, 45(5): 2757-2766. WEN Jing, HUANG Bang-jie, FANG Huai-yang, TAN Xiu-qin, WU Chen-long, HUANG Zhi-wei, ZHANG Zong-yao, LIN Shu, DU Hong-wei. Isotopic evidence for impacts of urbanization on active nitrogen turnover in the Dongjiang River Basin. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(5): 2757-2766.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I5/2757

[1] 谢丽纯,陈建耀.近10a来珠江三角洲地区氮收支演变及区域差异分析[J].自然资源学报, 2014,(2):237-248. Xie L C, Chen J Y. Nitrogen budgets of the Pearl River Delta and its regional differences during the past decade[J]. Journal of Natural Resources, 2014,(2):237-248.
[2] 龙颖贤,张玉环,卢加伟,等.珠三角地区水环境质量变化趋势及成因[J].环境影响评价, 2018,40(5):30-33. Long Y X, Zhang Y H, Lu J W, et al. Analysis on water quality tendency and its causes in Pearl River Delta region[J]. Environmental Impact Assessment, 2018,40(5):30-33.
[3] Kendall C, Elliott E M, Wankel S D. Tracing anthropogenic inputs of nitrogen to ecosystems[M]. Stable Isotopes in Ecology and Environmental Science, Oxford, UK: Blackwell Publishing Ltd, 2007.
[4] 刘昌明.二十一世纪中国水资源若干问题的讨论[J].水利水电技术, 2002,(1):15-19. Liu C M. Discussion on several issues of water resources in China in the 21st Century[J]. Water Resources and Hydropower Engineering, 2002,(1):15-19.
[5] Goonetilleke A, Thomas E, Ginn S, et al. Understanding the role of land use in urban stormwater quality management[J]. Journal of Environmental Management, 2005,74(1):31-42.
[6] Ache B W, Crossett K M, Pacheco P A, et al. “The Coast” is complicated: A model to consistently describe the nation’s coastal population[J]. Estuaries and Coasts, 2015,38(1):151-155.
[7] Yuan J, Li S Y, Han X, et al. Characterization and source identification of nitrogen in a riverine system of monsoon-climate region, China[J]. Science of the Total Environment, 2017,592:608-615.
[8] Archana A, Thibodeau B, Geeraert N, et al. Nitrogen sources and cycling revealed by dual isotopes of nitrate in a complex urbanized environment[J]. Water Research, 2018,142:459-470.
[9] Liu J, Shen Z Y, Yan T Z, et al. Source identification and impact of landscape pattern on riverine nitrogen pollution in a typical urbanized watershed, Beijing, China[J]. Science of the Total Environment, 2018, 628-629:1296-1307.
[10] Fowler D, Coyle M, Skiba U, et al. The global nitrogen cycle in the twenty-first century[J]. Philosophical Transactions of the Royal Society B: Biological Sciences, 2013,368(1621):20130164.
[11] Houlton B Z, Marklein A R, Bai, et al. Representation of nitrogen in climate change forecasts[J]. Nature Climate Change, 2015,5(5):398- 401.
[12] El-Khoury A, Seidou O, Lapen D R, et al. Combined impacts of future climate and land use changes on discharge, nitrogen and phosphorus loads for a Canadian river basin[J]. Journal of Environmental Management, 2015,151:76-86.
[13] Xian C F, Zhang X L, Zhang J J, et al. Recent patterns of anthropogenic reactive nitrogen emissions with urbanization in China: dynamics, major problems, and potential solutions[J]. Science of the Total Environment, 2019,656:1071-1081.
[14] Lin J J, Chen N W, Wang F F, et al. Urbanization increased river nitrogen export to western Taiwan Strait despite increased retention by nitrification and denitrification[J]. Ecological Indicators, 2020,109: 105756.
[15] Xuan Y X, Tang C Y, Liu G L, et al. Carbon and nitrogen isotopic records of effects of urbanization and hydrology on particulate and sedimentary organic matter in the highly urbanized Pearl River Delta, China[J]. Journal of Hydrology, 2020,591:125565.
[16] Hu M M, Xia B C, Wang Y F, et al. Long-term surface water mapping in the Pearl River Delta based on multiple satellite images[J]. River Research and Applications, 2021,38(2):245-255.
[17] Véronique B, Patrick D, Laurent R, et al. A hydrological model dedicated to topography-based simulation of nitrogen transfer and transformation: rationale and application to the geomorphology– denitrification relationship[J]. Hydrological Processes, 2002,16(2): 493-507.
[18] Nguyen T T, Keupers I, Willems P, et al., Conceptual river water quality model with flexible model structure[J]. Environmental Modelling& Software, 2018,104:102-117.
[19] Wang X S, Jiao J J, Wang Y, et al. Accumulation and transport of ammonium in aquitards in the Pearl River Delta (China) in the last 10,000 years: conceptual and numerical models[J]. Hydrogeology Journal, 2013,21(5):961-976.
[20] Denk T R A, Mohn J, Decock C, et al. The nitrogen cycle: A review of isotope effects and isotope modeling approaches[J]. Soil Biology& Biochemistry, 2017,105:121-137.
[21] Nikolenko O, Jurado A, Borges A V, et al. Isotopic composition of nitrogen species in groundwater under agricultural areas: A review[J]. Science of the Total Environment, 2018,621:1415-32.
[22] Richard Devereux Y S, Wan J L, Rackley V, et al. Comparative analysis of nitrogen concentrations and sources within a coastal urban bayou watershed: A multi-tracer approach[J]. Science of the Total Environment, 2021,776:145862.
[23] Xuan Y X, Mai Y W, Xu Y Q, et al. Enhanced microbial nitrificationdenitrification processes in a subtropical metropolitan river network[J]. Water Research, 2022,222:118857.
[24] 周春山,王宇渠,徐期莹,等.珠三角城镇化新进程[J].地理研究, 2019,38(1):45-63. Zhou C S, Wang Y Q, Xu Q Y, et al. New process of urbanization in the Pearl River Delta[J]. Geographical research, 2019,38(1):45-63.
[25] 解晨骥.东江流域化学风化的碳汇效应及河流溶解碳的输出过程[D].广州:中山大学, 2014. Xie C J. Carbon sink effect of chemical weathering and export process of dissolved Carbon in Dongjiang River basin[D]. Guangzhou: Sun Yat-sen University, 2014.
[26] Yin K, Qian P Y, Jay C C, et al. Dynamics of nutrients and phytoplankton biomass in the Pearl River estuary and adjacent waters of Hong Kong during summer: preliminary evidence for phosphorus and silicon limitation[J]. Marine Ecology Progress Series, 2000,194: 295-305.
[27] 东莞市统计局.2023年东莞市国民经济和社会发展统计公报[R/OL].(2024-04-12)[2024-10-01]. ://www.dg.gov.cn/zjdz/ dzgk/shjj/content/post_4187648.html. Dongguan Municipal Bureau of Statistics. 2023Dongguan Economic and Social Development Statistical Bulletin[R/OL].(2024-04-12)[2024-10-01].
[28] Liu D, Fang Y, Tu Y, et al. Chemical method for nitrogen isotopic analysis of ammonium at natural abundance[J]. Analytical Chemistry, 2014,86(8):3787-3792.
[29] Sigman D M, Casciotti K L, Andreani M, et al. A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater[J]. Analytical Chemistry, 2001,73(17):4145-4153.
[30] Granger J, Sigman D M, Needoba J A, et al. Coupled nitrogen and oxygen isotope fractionation of nitrate during assimilation by cultures of marine phytoplankton[J]. Limnology and Oceanography, 2004, 49(5):1763-1773.
[31] Chen Y, Yang J, Tang J M, et al. Changes in isotope fractionation during nitrate assimilation by marine eukaryotic and prokaryotic algae under different pH and CO₂ conditions[J]. Limnology and Oceanography, 2024,69(5):1045-1055.
[32] Mariotti A, Germon J C, Hubert P, et al. Experimental determination of nitrogen kinetic isotope fractionation: Some principles; illustration for the denitrification and nitrification processes[J]. Plant& Soil, 1981, 62(3):413–430.
[33] 温婧,黄邦杰,黄志伟,等.感潮河流氮行为对溶解氧亏损的限定影响[J].中国环境科学, 2023,43(8):4003-4012. Wen J, Huang B J, Huang Z W, et al. Constraint of nitrogen behavior on dissolved oxygen deficit in the tidal river[J]. China Environmental Science, 2023,43(8):4003-4012.
[34] Xuan Y X, Tang C Y, Cao Y J, et al. Mechanisms of nitrate accumulation in highly urbanized rivers: evidence from multi-isotopes in the Pearl River Delta, China[J]. Journal of Hydrology, 2020,587: 124924.
[35] Ye F, Jia G D, Xie L H, et al. Isotope constraints on seasonal dynamics of dissolved and particulate N in the Pearl River Estuary, south China[J]. Journal of Geophysical Research: Oceans, 2016,121:8689-8705.
[36] Ye F, Jia G, Wei G, et al. A multi-stable isotopic constraint on water column oxygen sinks in the Pearl River Estuary, South China[J]. Marine Environmental Research, 2022,178:105643.
[37] Glibert P M, Wilkerson F P, Dugdale R C, et al. Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions[J]. Limnology and Oceanography, 2016,61(1):165-197.
[38] Xia Y, Li Y, Zhang X, et al. Nitrate source apportionment using a combined dual isotope, chemical and bacterial property, and Bayesian model approach in river system[J]. Journal of Geophysical Research: Biogeosciences, 2017,122(1):2-14.
[39] York J K, Tomasky G, Valiela I, et al. Stable isotopic detection of ammonium and nitrate assimilation by phytoplankton in the Waquoit Bay estuarine system[J]. Limnology and Oceanography, 2007,52: 144-155.
[40] Lohse K A, Sanderman J, Amundson R. Identifying sources and processes influencing nitrogen export to a small stream using dual isotopes of nitrate[J]. Water Resource Research, 2013,49(9):5715- 5731.
[41] Kelley C J, Keller C K, Evans R D, et al. Nitrate–nitrogen and oxygen isotope ratios for identification of nitrate sources and dominant nitrogen cycle processes in a tile-drained dryland agricultural field[J]. Soil Biology& Biochemistry, 2013,57:731-738.
[42] Yue F J, Liu C Q, Li S L, et al. Analysis of δ¹⁵N and δ¹⁸O to identify nitrate sources and transformations in Songhua River, Northeast China[J]. Journal of Hydrology, 2014,519:329-339.
[43] Ye H J, Tang C Y, Cao Y J, et al. Sources and transformation mechanisms of inorganic nitrogen: Evidence from multi-isotopes in a rural-urban river area[J]. Science of the Total Environment, 2021,794: 148615.
[44] Xue D, Botte J, De Baets B, et al. Present limitations and future prospects of stable isotope methods for nitrate source identification in surface- and groundwater[J]. Water Research, 2009,43(5):1159-1170.
[45] Kendall C, Silva S R, Kelly V J. Carbon and nitrogen isotopic compositions of particulate organic matter in four large river systems across the United States[J]. Hydrological Processes, 2001,15(7):1301- 1346.
[46] Groffman P M, Boulware N J, Zipperer W C, et al. Soil nitrogen cycle processes in urban riparian zones[J]. Environmental Science& Technology, 2002,36(21):4547-4552.
[47] McPhillips L E, Groffman P M, Goodale C L, et al. Hydrologic and biogeochemical drivers of riparian denitrification in an agricultural watershed[J]. Water, Air,& Soil Pollution, 2015,226(6):169.
[48] Wang A, Fang Y T, Chen D X, et al. High nitrogen isotope fractionation of nitrate during denitrification in four forest soils and its implications for denitrification rate estimates[J]. Science of the Total Environment, 2018,633:1078-1088.