沿海垦区排水沟系碳氮空间分布特征及其影响因子  

Spatial Distribution Characteristics of Carbon and Nitrogen Among Drainage Ditch System and Their Influencing Factors in Coastal Reclamation District

作　　者：白胤豪 戴学林 董茂秋 陈士浩 顾伟生 周瑞 史祯琦 潘永春 BAI Yin-hao;DAI Xue-lin;DONG Mao-qiu;CHEN Shi-hao;GU Wei-sheng;ZHOU Rui;SHI Zhen-qi;PAN Yong-chun(College of Agricultural Science and Engineering,Hohai University,Nanjing 211100,Jiangsu Province,China;Jiangsu Huaihai Nongchang Co.,Ltd,Nanjing 211100,Jiangsu Province,China;Jiangsu Shanshui Land Resources Development Engineering Co.,Ltd,Nanjing 211100,Jiangsu Province,China;College of Soil and Water conservation,Hohai University,Changzhou 213200,Jiangsu Province,China)

机构地区：[1]河海大学农业科学与工程学院,江苏南京211100 [2]江苏省淮海农场有限公司,江苏南京211100 [3]江苏山水国土资源开发工程有限公司,江苏南京211100 [4]河海大学水土保持学院,江苏常州213200

出　　处：《节水灌溉》2025年第3期18-23,共6页Water Saving Irrigation

基　　金：江苏省自然资源科技项目(2022046);淮海农场水环境综合整治项目(2022);江苏省自然资源科研课题(2024003)。

摘　　要：溶解性有机碳(DOC)是碳循环的重要组成部分,而总氮(TN)浓度是表征氮素循环的关键要指标,DOC与TN在沿海排水沟中的分布特征直接影响沿海农业环境的质量。研究通过对江苏沿海垦区典型排水沟系水体DOC和TN浓度变化及其影响因子进行系统研究,揭示了不同级别排水沟道中的碳氮分布特征。结果表明,北八滩排水沟系DOC和TN浓度变化范围分别为3.90~18.36 mg/L和2.32~7.10 mg/L,沟系水体DOC和TN浓度呈现明显的空间分布规律,不同沟道级别DOC和TN浓度顺序为:斗沟>支沟>干沟,污染物浓度自内陆向海岸段呈现先升后降的变化趋势。DOC与TN浓度呈显著正相关,表明两者具有相似的污染来源和汇流路径。此外,环境因子如温度(T)、溶解氧(DO)、电导率(EC)等对水体碳氮浓度的变化具有显著影响,特别是咸淡水交汇区的盐分变化对DOC和TN的消纳过程起到关键作用。本研究为垦区农业面源污染防治和滩涂生态环境保护提供了理论依据,并为进一步提升排水沟系的环境管理提出了参考建议。Dissolved organic carbon(DOC)is a crucial component of the global carbon cycle,while total nitrogen(TN)concentration serves as a key indicator of nitrogen cycling.The distribution of DOC and TN in coastal drainage ditches significantly affects the quality of coastal agricultural environments.This study systematically analyzed changes in DOC and TN concentrations,along with their influencing factors,in typical drainage ditch systems within the coastal reclamation areas of Jiangsu Province.The results highlighted the distribution patterns of carbon and nitrogen in various levels of drainage ditches.DOC and TN concentrations in the Beibatan drainage system ranged from 3.90~18.36 mg/L and 2.32~7.10 mg/L,respectively,with a clear spatial distribution pattern.The concentration order in different ditch levels was lateral ditch>branch ditch>main ditch.Pollutant concentrations first increased and then decreased from inland to coastal sections.A significant positive correlation between DOC and TN suggested that they share common pollution sources and runoff pathways.Moreover,environmental factors such as temperature(T),dissolved oxygen(DO),and electrical conductivity(EC)greatly influenced the variations in carbon and nitrogen concentrations in water bodies,particularly the salinity changes in brackish water areas,which play a key role in the removal processes of DOC and TN.This study provides a theoretical foundation for controlling agricultural non-point source pollution and protecting the mudflat ecological environment in reclamation areas,and offers insights for enhancing the environmental management of drainage ditch systems.

关 键 词：沿海垦区 排水沟系 溶解性有机碳 总氮 空间分布 影响因子 

分 类 号：S27[农业科学—农业水土工程]