摘要
为揭示我国不同土地利用类型区域河流中硝酸盐来源,本研究收集了我国42个流域旱季、雨季的NO_(3)^(-)-N浓度数据,以及δ^(15)N-NO_(3)和δ^(18)O-NO_(3)的特征值,并开展整合分析。结果表明,旱季河流的NO_(3)^(-)-N、NH_(4)^(+)-N和Cl^(-)浓度均显著高于雨季(P<0.05),其反应比lnR分别为0.20、0.54和0.14。整合分析表明,雨季河流中硝酸盐主要来自氮肥(相对比率RR=0.81),而旱季硝酸盐主要来自污水和粪便(RR=1.04)。我国不同土地利用类型区域河流硝酸盐的来源差异显著,其中城市用地主要受污水与粪便影响(RR=1.10),农业用地雨季受氮肥源(RR=0.77)、土壤氮源(RR=0.86)和污水与粪便源(RR=0.94)的共同影响。农业城市混合用地具有城市和农业用地的特征,旱季和雨季分别受污水粪便源(RR=1.23)和氮肥源(RR=0.58)的影响,而农林用地受人类活动影响较小。本研究为不同土地利用类型区域河流硝酸盐溯源提供了方向,为河流硝酸盐污染的控制提供了科学依据。
Nitrate pollution in surface water has attracted global attention.In order to reveal the sources of nitrate in surface water under different land-use types in China,the concentrations of NO_(3)^(-)-N,NH_(4)^(+)-N and Cl^(-)and the characteristic values ofδ^(15)N-NO_(3) andδ^(18)O-NO_(3) in 42 watersheds in dry and wet seasons were collected and evaluated by meta-analysis.Meta-analysis results showed that the concentrations of NO_(3)^(-)-N(Response ratio,lnR=0.20),NH_(4)^(+)-N(lnR=0.54)and Cl^(-)(lnR=0.14)in the dry season were significantly higher than in the wet season(P<0.05).The main source of nitrate in the wet season was nitrogen fertilizer(Relative rate,RR=0.81),and in the dry season was manure and sewage(RR=1.04).Meta-analysis results showed that land use type had a significant influence on the source of nitrate.Urban land was mainly affected by manure and sewage(RR=1.10),and agricultural land was affected by nitrogen fertilizer(RR=0.77),soil nitrogen(RR=0.86)and manure and sewage(RR=0.94)in the wet season.Agricultural urban mixed land had characteristics of both urban and agricultural land.Manure and sewage(RR=1.23)and nitrogen fertilizer(RR=0.58)were the main sources in agricultural urban mixed land in dry and wet seasons,respectively.Agricultural and forestry lands were less influenced by human activities.This study provides a direction for the traceability of nitrate sources in rivers from different land use types,and provides a scientific basis for the control of nitrate pollution in rivers crossing different land use types.
作者
张金兰
蔺祖弘
白文荣
郇正来
张婷婷
林爱军
肖勇
ZHANG Jinlan;LIN Zuhong;BAI Wenrong;HUAN Zhenglai;ZHANG Tingting;LIN Aijun;XIAO Yong(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Beijing North Canal Management Division,Beijing 101100,China)
出处
《农业资源与环境学报》
CAS
CSCD
北大核心
2021年第5期746-754,共9页
Journal of Agricultural Resources and Environment
基金
国家科技重大专项(2018ZX07111003)。
