摘要
内陆水体是大气CO_(2)收支估算的重要组成部分。农业流域分布着大量池塘景观水体,且具备蓄洪抗旱、消纳污染、水产养殖等多种功能。但是,农业流域不同功能的小型池塘CO_(2)排放特征尚不清楚。本研究以极具农业流域代表性的烔炀河流域为研究对象,选取流域中用于水产养殖(养殖塘)、生活污水承纳(村塘)、农业灌溉(农塘)、蓄水(水塘)的4个功能不同的景观池塘,基于为期1年的野外实地观测,以明确农业流域小型池塘CO_(2)排放特征。结果表明,不同功能池塘水体CO_(2)排放差异显著,受养殖活动、生活污水输入和农田灌溉等人类活动影响,养殖塘((80.37±100.39)mmol/(m^(2)·d))、村塘((48.69±65.89)mmol/(m^(2)·d))和农塘((13.50±15.81)mmol/(m^(2)·d))是大气CO_(2)的热点排放源,其CO_(2)排放通量分别是自然蓄水塘((4.52±23.26)mmol/(m^(2)·d))的18、11和3倍。统计分析也表明,该流域池塘CO_(2)排放变化总体上受溶解氧、营养盐等因素驱动。4个不同景观池塘CO_(2)排放通量全年均值为(37.31±67.47)mmol/(m^(2)·d),是不容忽视的CO_(2)排放源,其中养殖塘和村塘具有较高的CO_(2)排放潜力,在未来研究中需要重点关注。
Inland waters played a critical role in atmospheric CO_(2)budget estimation.Among them,ponds receive more external loadings per unit area due to shallow in water depth and small in size,likely leading to their hot emission sources of atmospheric CO_(2).A large number of ponds are distributed in agricultural watersheds,offering diverse functions including flood storage and drought resistance,pollution removal and aquaculture.However,the CO_(2)emission characteristics of small ponds with different functions in agricultural basins are still unclear.In this study,the Tongyang River basin,a typical agricultural basin,was used as the study area.Four landscape ponds with different functions,including aquaculture pond,domestic sewage bearing pond(village pond),agricultural irrigation pond(agricultural pond)and water storage pond(storage pond),were selected in this basin to estimate the CO_(2)emissions based on the one-year field observation from September 2020 to September 2021.The results showed substantial variations in CO_(2)emissions among different ponds.Under the influence of human activities such as aquaculture activities,domestic sewage input and farmland irrigation,aquaculture pond,sewage pond and agricultural pond were the hot spots of atmospheric CO_(2)emission.The CO_(2)emission fluxes were 18,11 and 3 times that of storage pond((4.52±23.26)mmol/(m^(2)·d)),respectively.Statistical analysis showed that the variation of CO_(2)emission was mainly driven by dissolved oxygen and nutrients.The average annual CO_(2)emission fluxes was(37.31±67.47)mmol/(m^(2)·d),indicating a significant source of CO_(2)emission.Large CO_(2)emissions occurred in aquaculture and sewage ponds,highlighting the need for increased attention and focus in future research.
作者
陈嘉宁
肖启涛
刘臻婧
肖薇
谢晖
罗菊花
邱银国
胡正华
段洪涛
Chen Jianing;Xiao Qitao;Liu Zhenjing;Xiao Wei;Xie Hui;Luo Juhua;Qiu Yinguo;Hu Zhenghua;Duan Hongtao(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,P.R.China;Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China;Hunan Climate Center,Changsha 410118,P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2024年第1期88-98,共11页
Journal of Lake Sciences
基金
国家自然科学基金项目(42271114)
江苏省碳达峰碳中和科技创新专项资金项目(BK20220018)
江苏省基础研究计划自然科学基金杰出青年基金项目(BK20220055)联合资助。
