城市圈层和水体管理措施对小水体无机氮含量空间分布格局的影响:以湖南省长沙市为例  

Effects of urban circle and water management measures on spatial distribution pattern of inorganic nitrogen content in small water bodies:A case study of Changsha,Hunan Province

作　　者：焦军霞 石锦 周脚根 雷秋良[4] JIAO Junxia;SHI Jin;ZHOU Jiaogen;LEI Qiuliang(Zhengzhou University Environmental Technology and Consulting Limited Company,Zhengzhou 450002,China;Hunan Institute of Water Resources and Hydropower Research,Changsha 410125,China;Jiangsu Provincial Engineering Research Center for Intelligent Monitoring and Ecological Management of Pond and Reservoir Water Environment,Huaiyin Normal University,Huaian 223300,China;Key Laboratory of Nonpoint Source Pollution Control,Ministry of Agriculture and Rural Affairs,China,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China)

机构地区：[1]郑州大学环境技术咨询工程有限公司,郑州450002 [2]湖南省水利水电科学研究院,长沙410125 [3]淮阴师范学院江苏省塘库智能监测与水环境生态管控工程研究中心,江苏淮安223300 [4]中国农业科学院农业资源与农业区划研究所农业农村部面源污染控制重点实验室,北京100081

出　　处：《环境工程》2025年第2期11-20,共10页Environmental Engineering

基　　金：国家自然科学基金项目(41877009);国家自然科学基金区域创新发展联合基金项目(U20A20114);淮安自然科学基金项目(HABL202105)。

摘　　要：研究小水体无机氮(DIN)含量的空间变化规律及其驱动因素,有助于科学制定城市小水体污染防控方案。以长沙市为研究区,随机取样监测68个小水体中DIN含量,按其距市中心距离划分为<5 km、5~10 km、>10 km 3个圈层,探讨小水体中氨氮(NH_(4)^(+)-N)、硝态氮(NO_(3)^(-)-N)和DIN含量的空间分异及其影响因素。结果表明:研究区小水体DIN含量总体具有较大的变异性(CV达178.42%),其中,7.35%的小水体处于NH_(4)^(+)-N污染状态。>10 km圈层内小水体NH_(4)^(+)-N、NO_(3)^(-)-N和DIN含量均值高于<5 km和5~10 km圈层水体,表明城市小水体NH_(4)^(+)-N、NO_(3)^(-)-N和DIN含量随离城市中心距离呈增加趋势。城郊地带的养殖小水体NH_(4)^(+)-N和DIN含量均值高于位于城中心的长期生态受保护、生态恢复和生态退化3种小水体。同时,层次方差分解分析结果表明,城市圈层和水体管理模式对NH_(4)^(+)-N、NO_(3)^(-)-N和DIN方差变异的总贡献分别为59.5%、49.2%和68.5%,进一步证实离城市中心距离和水体管理模式是影响小水体DIN组份含量变异的主要因素,且两者发展实施不协调。小水体污染面临着从城区向城郊转移的风险,需要进一步加强全局协调和统筹规划防控治理。Understanding the spatial variation of inorganic nitrogen(DIN)and its driving factors in urban small water bodies is helpful for the scientific development of urban small water pollution prevention and control programs.Taking Changsha as the research area,DIN content in 68 small water bodies was randomly sampled and monitored,and spatial differentiation of NH_(4)^(+)-N,NO_(3)^(-)-N and DIN content and its influencing factors in small water bodies were discussed.Three circles were divided by their distance from the urban center as<5 km,5 km to 10 km,and>10 km.The results showed that the DIN content of small water bodies in the study area had great variability(with a CV value up to 178.42%),and 7.35%were in NH_(4)^(+)-N pollution state.The average NH_(4)^(+)-N,NO_(3)^(-)-N and DIN contents in small water bodies in the>10 km circle was higher than those in the<5 km,and 5 km to 10 km circles,which indicated that the NH_(4)^(+)-N,NO_(3)^(-)-N and DIN content of small water bodies increased with distance from the urban center.The average NH_(4)^(+)-N and DIN content of small aquaculture water in the suburban area was higher than that of ecological protection,ecological restoration and ecological degradation in the urban center.Further analysis of hierarchical variance decomposition showed that the total contributions of the circle layer and water management mode to the variance variation of NH_(4)^(+)-N,NO_(3)^(-)-N and DIN were 59.5%,49.2%and 68.5%,respectively,which further confirmed that the distance to the urban center and water management mode were the main factors affecting the variation of DIN component content in the study area.Moreover,the urban development trend and the implementation of water environment management measures were not coordinated,and small water bodies were possessing the risk of transferring from urban areas to suburban areas,and it was necessary to further strengthen the overall coordination and planning for risk control.

关 键 词：氨氮 硝态氮 无机氮 小水体 离城市中心距离 水环境管理 

分 类 号：X52[环境科学与工程—环境工程]