| 脱甲河水系N2O关键产生过程及氮素来源探讨 |
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| 引用本文： | 赵强,吕成文,秦晓波,吴红宝,万运帆,廖育林,鲁艳红,李健陵.脱甲河水系N2O关键产生过程及氮素来源探讨[J].环境科学,2018,39(10):4497-4504. |
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| 作者姓名： | 赵强 吕成文 秦晓波 吴红宝 万运帆 廖育林 鲁艳红 李健陵 |
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| 作者单位： | 中国农业科学院农业环境与可持续发展研究所农业部农业环境重点实验室;安徽师范大学国土资源与旅游学院;湖南省土壤肥料研究所 |
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| 基金项目： | 国家自然科学基金项目（41475129，41775157）；国家发改委CDM基金项目（2014081） |
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| 摘 要： | 开展氮素迁移转化研究有助于深入了解农业小流域氮循环过程,也可为小流域氮素流失溯源提供典型案例.为深入了解和识别脱甲河水系N_2O关键产生过程和流域氮素主要来源,采用稳定同位素方法,于2016年11月至次年10月分析了脱甲河4级(S1~S4)河段水体硝态氮的氮氧双同位素(δ~(15)N-NO_3~-、δ~(18)O-NO_3~-)和沉积物有机质氮同位素(δ~(15)N_(org))、碳氮比值(C/N)特征;探讨了流域氮素的迁移转化过程及其来源.结果表明,水体δ~(15)N-NO_3~-、δ~(18)O-NO_3~-分别在-19.87‰~8.11‰和-3.03‰~5.81‰范围内变化,氮素来源具有多元化特征且各河段存在差异.S1~S4河段δ~(15)N-NO_3~-均值分别为1.72‰、2.62‰、4.10‰和-1.28‰,而δ~(18)O-NO_3~-均值依次为2.60‰、-0.06‰、0.85‰和-0.62‰.S1河段硝态氮来源于土壤流失氮,而S2和S3来源为土壤流失氮、铵态氮肥和人畜粪便,S4则来源于铵态氮肥的硝化反应;硝态氮来源受生产生活影响显著.沉积物有机质δ~(15)N(δ~(15)N_(org))和C/N值波动范围分别是-0.69‰~11.21‰和7.30~12.02,S1~S4河段δ~(15)N_(org)均值分别为1.91‰、2.96‰、4.72‰和3.23‰,C/N均值分别是10.62、8.63、9.05和9.22.S1河段沉积物氮素来源于土壤有机质,而S2~S4河段δ~(15)N_(org)虽存在差异,但其来源均主要为流域内的污水.而硝化过程中δ~(18)O-NO_3~-分别是-7.01‰、-0.17‰、-0.28‰和-0.60‰;δ~(15)N-NO_3~-与δ~(18)O-NO_3~-的比值分别为0.66、-41.01、-30.23和9.39;S1~S4河段NO_3~--N质量浓度为1.08、1.46、1.54和1.50 mg·L-1,δ~(15)N-NO_3~-与NO_3~--N浓度呈正相关.因此,脱甲河水系中氮素转化可能以硝化过程为主体,硝化过程对N_2O的贡献可能占据优势.
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| 关 键 词： | 脱甲河 N2 O 关键产生过程 氮素来源 δ15N δ18O |
| 收稿时间： | 2018/2/3 0:00:00 |
| 修稿时间： | 2018/4/13 0:00:00 |
Key Production Process of Nitrous Oxide and Nitrogen Sources in Tuojia River |
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| ZHAO Qiang,L&#; Cheng-wen,QIN Xiao-bo,WU Hong-bao,WAN Yun-fan,LIAO Yu-lin,LU Yan-hong and LI Jian-ling.Key Production Process of Nitrous Oxide and Nitrogen Sources in Tuojia River[J].Chinese Journal of Environmental Science,2018,39(10):4497-4504. |
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| Authors: | ZHAO Qiang L&#; Cheng-wen QIN Xiao-bo WU Hong-bao WAN Yun-fan LIAO Yu-lin LU Yan-hong and LI Jian-ling |
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| Institution: | Key Laboratory of Agricultural Environment, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, China,College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, China,Key Laboratory of Agricultural Environment, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China,Key Laboratory of Agricultural Environment, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China,Key Laboratory of Agricultural Environment, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China,Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China,Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China and Key Laboratory of Agricultural Environment, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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