沙颍河典型河段河岸带土壤理化性质对地下水氮污染的影响

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摘要以沙颍河典型河段为研究对象,通过采集果园和农田河岸带的河水、土壤以及地下水样品,并进行理化指标分析,旨在深入探讨土壤理化性质对河岸带地下水氮浓度的影响机制.结果表明:农田河岸带土壤总氮(TN)含量明显高于果园河岸带,达到其TN的1.15倍,并均在距河岸约200m处达到最高值.河岸带地下水与土壤氮含量有一定的响应关系,呈现出相似的空间分布特征.农田河岸带地下水NO₃^--N浓度(0.56~25.17mg/L)显著高于果园河岸带(0~0.97mg/L);远岸(>200m)地下水NO₃^--N浓度均高于近岸(< 100m).土壤氮素是河岸带地下水氮污染的主要来源之一.土壤中的黏土颗粒含量和施氮量较高,使得土壤颗粒更易于吸附NO₃^--N,增加了河岸带地下水氮污染的风险.本研究揭示了河岸带土壤理化性质对地下水氮含量的影响机制,为河岸带地下水氮污染防控提供了参考依据.这些发现有助于制定可行的土地管理策略,以减缓或防止地下水氮污染的进一步扩散.

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	李宝玲
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	秦明周

关键词 ：沙颍河, 河岸带, 土壤理化性质, 地下水氮含量, 影响机制

Abstract：Taking the typical section of Shaying River as the research object, we collected river water, soil and groundwater samples from riparian zones and analyzed the physicochemical indexes, aiming to deeply explore the impact mechanism of soil physical and chemical properties on groundwater nitrogen concentration in the riparian zones. The results showed that the total nitrogen (TN) content in farmland riparian soils is higher than that of the riparian zone of orchards, indicating a 1.15 times higher TN content. The TN contents of the riparian soils were highest at about 200m from the river bank. There is a certain response relationship between groundwater and soil nitrogen content in the riparian zone, showing similar spatial distribution characteristics. Groundwater NO₃^--N concentrations in the riparian zone of agricultural fields (0.56~25.17mg/L) were significantly higher than those in the riparian zone of orchards (0~0.97mg/L); groundwater NO₃^--N concentrations in the far bank (>200m) were significantly higher than those in the near bank (<100m). Soil nitrogen is one of the main sources of nitrogen pollution in riparian groundwater. The high content of clay particles in the soil and the amount of nitrogen application make the soil particles more likely to adsorb NO₃^--N. It increases the risk of nitrogen pollution in riparian groundwater. This study reveals the influence mechanism of soil physical and chemical properties on groundwater nitrogen content in the riparian zones. It provides a reference for the prevention and control of groundwater nitrogen pollution in locally. These findings could help develop feasible land management strategies to slow or prevent the further spread of groundwater nitrogen contamination.

Key words： Shaying River riparian zone soil physical and chemical properties nitrogen content in groundwater influence mechanism

收稿日期: 2023-11-02

PACS:

X142

基金资助:国家自然科学基金资助项目(41877161);世界大河流域生态保护信息化研究(K23036Y);河南省土壤生态环境重点实验室建设经费(J23068Y)

通讯作者: 杨丽虎,高级工程师,yanglihu@igsnrr.ac.cn;宋献方,研究员,songxf@igsnrr.ac.cn E-mail: yanglihu@igsnrr.ac.cn;songxf@igsnrr.ac.cn

作者简介: 李宝玲(1992-),女,河南郑州人,讲师,博士,主要从事流域水循环与水环境研究.发表论文10余篇.libaoling@henu.edu.cn.

引用本文:

李宝玲, 杨丽虎, 宋献方, 秦明周. 沙颍河典型河段河岸带土壤理化性质对地下水氮污染的影响[J]. 中国环境科学, 2024, 44(7): 3955-3965. LI Bao-ling, YANG Li-hu, SONG Xian-fang, QIN Ming-zhou. The influence of soil physics and chemical properties on groundwater nitrogen pollution in the riparian zone of Shaying River. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3955-3965.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I7/3955

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