[Differences in Nitrogen Sources and Contributions in Shallow Groundwater in Plateau Lake Area with Different Climate Types].

Q2 Environmental Science
Jin-Heng Min, An-Qiang Chen, Lin Li, Yuan-Hang Ye, Dan Zhang, Rong Wang
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引用次数: 0

Abstract

Clarifying the concentration, major sources, and contribution differences of nitrogen in shallow groundwater in plateau lake areas with different climate types can provide a novel direction for the control of nitrate (NO3-) pollution in regional groundwater. Taking the shallow groundwater around Erhai Lake in the subtropical monsoon climate zone and Chenghai Lake in the dry-hot valley area of the Jinsha River as the research objects, using hydrochemical indexes and multi-isotope techniques (δ15N-NO3-, δ18O-NO3-, δ18O-H2O, and δ2H-H2O) combined with the stable isotope (SIAR) model; the differences in nitrogen concentration in shallow groundwater around Erhai Lake and Chenghai Lake were analyzed, the sources of NO3- were identified, and the contribution rates of each pollution source were calculated. The results showed that water quality of more than 33% and 5% of shallow groundwater sampling points around Erhai Lake and Chenghai Lake was worse than the groundwater Class Ⅲ quality requirements (GB/T 14848) of 20 mg·L-1 for nitrate nitrogen (NO3--N), respectively. The δ18O-H2O and δ2H-H2O in shallow groundwater around Erhai Lake and Chenghai Lake were parallel to the global and Chinese atmospheric precipitation lines, and a large intercept was present, indicating that atmospheric precipitation was not the major recharge source of groundwater in the two regions. The contribution rate of different NO3- sources in shallow groundwater around Erhai Lake was the highest for soil organic nitrogen (53.77%), followed by nitrogen fertilizer (21.75%) and manure and sewage (21.55%), and atmospheric deposition nitrogen (2.93%) was the lowest. Denitrification occurred in the transformation process of nitrogen in groundwater. The contribution rate of different NO3- sources in shallow groundwater around Chenghai Lake was manure and sewage (44.88%) > soil organic nitrogen (37.03%) > nitrogen fertilizer (16.17%) > atmospheric deposition nitrogen (1.92%), and nitrification occurred in the transformation process of nitrogen in groundwater. The climate type significantly affected the shallow groundwater level, altering the migration and transformation process of nitrogen, thereby affecting the nitrogen concentration in groundwater and the contribution of NO3- as the chief source. However, the major source of NO3- was not affected by the climate type; however was more affected by land use, agricultural activities, and manure treatment methods.

[不同气候类型高原湖区浅层地下水氮源及其贡献率的差异]。
明确不同气候类型的高原湖泊地区浅层地下水中氮的浓度、主要来源和贡献率差异,可为控制区域地下水中硝酸盐(NO3-)污染提供新的方向。污染的新方向。以亚热带季风气候区的洱海和金沙江干热河谷区的程海湖周边浅层地下水为研究对象,利用水化学指标和多同位素技术(δ15N-NO3-、δ18O-NO3-、δ18O-H2O、δ2H-H2O)结合稳定同位素(SIAR)分析了洱海和程海周边浅层地下水氮浓度的差异,确定了 NO3- 的来源,并计算了各污染源的贡献率。结果表明,洱海、程海湖周边分别有 33%和 5%以上的浅层地下水采样点的水质劣于地下水Ⅲ类水质要求(GB/T 14848),其中硝酸盐含量为 20 mg-L-1硝态氮(NO3--N)分别为 20 mg-L-1。洱海、程海湖周边浅层地下水的δ18O-H2O和δ2H-H2O与全球和中国大气降水线平行,且存在较大的截距,表明大气降水不是两地地下水的主要补给来源。不同氮源对洱海周边浅层地下水中 NO3- 的贡献率最高的是土壤有机氮(53.77%),其次是氮肥(21.75%)和粪便污水(21.75%)。其次是氮肥(21.75%)和粪便污水(21.55%),大气沉降氮(2.93%)最低。最低。地下水中的氮在转化过程中发生了反硝化作用。不同氮源对澄海湖周边浅层地下水中NO3-的贡献率分别为粪便污水(44.88)土壤有机氮(37.03)氮肥(16.17)大气沉降氮(1.92%),地下水氮转化过程中发生了硝化作用。气候类型极大地影响了浅层地下水位,改变了氮的迁移和转化过程,从而影响了地下水中的氮浓度,NO3-成为主要来源。然而,NO3- 的主要来源并不受气候类型的影响,而更多地受到土地利用、农业活动和粪便处理方法的影响。
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
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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