农业流域小型池塘水体溶解无机碳变化特征  

Variations of dissolved inorganic carbon in small ponds in agricultural basins

作　　者：陈嘉宁 肖启涛 刘臻婧 邱银国 胡正华[1] CHEN Jianing;XIAO Qitao;LIU Zhenjing;QIU Yinguo;HU Zhenghua(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Lake and Watershed Science for water Secaristy,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Hunan Climate Center,Changsha 410118,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]中国科学院南京地理与湖泊研究所,湖泊与流域水安全重点实验室,南京210008 [3]湖南省气候中心,长沙410118

出　　处：《生态学杂志》2025年第3期814-822,共9页Chinese Journal of Ecology

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);中国科学院青年创新促进会会员项目(2023329)资助。

摘　　要：内陆水体是全球碳循环及温室气体收支估算中的重要组成部分,溶解无机碳(DIC)在水体碳循环及温室效应中占有枢纽地位。本研究以烔炀河流域为对象,选取该农业流域中的养殖塘、排污塘和自然塘3个功能不同的池塘,基于野外实地观测,研究了农业流域小型池塘DIC浓度特征及其影响因素。结果表明:不同功能池塘水体DIC浓度差异显著,受人为活动影响强烈的养殖塘(22.04±5.44 mg·L^(-1))和排污塘(17.84±2.50 mg·L^(-1))的DIC浓度明显高于自然塘的浓度(14.56±1.74 mg·L^(-1));不同功能池塘水体DIC浓度季节变化特征明显,其中自然塘DIC浓度时间变化模式为冷季高暖季低,主要受流域气温和降雨驱动;养殖塘和排污塘DIC浓度季节变化特征与自然塘不同,主要受水体营养盐(氨氮和总磷等)负荷等驱动。综上,农业流域小型池塘水体DIC显著的时空变化特征是多种因素综合作用的结果,未来应重点关注农业流域小型池塘水体碳循环研究。Inland water bodies are crucial to global carbon cycle and greenhouse gas budget estimations,with dissolved inorganic carbon(DIC)playing a central role in aquatic carbon dynamics.We investigated the characteristics and influencing factors of DIC concentrations based on year-long field observations on three functionally different ponds(aquaculture pond,sewage pond,and natural pond)of the Tongyang River Basin,a typical agricultural basin in eastern China.The results showed that there were significant differences in DIC concentration among the ponds with functional differences.Aquaculture pond had the highest DIC,with an annual mean value of 22.04±5.44 mg·L^(-1),followed by sewage pond(17.84±2.50 mg·L^(-1)).The lowest DIC concentrations occurred in natural pond(14.56±1.74 mg·L^(-1)).Seasonal fluctuations in DIC were found in these ponds.A notable feature was that natural pond showed higher concentrations in the cold season and lower in the warm mostly due to the seasonal changes in temperature and precipitation.In contrast,DIC concentrations in aquaculture and sewage ponds showed different seasonal trends,which were influenced mainly by water body nutrient loads(e.g.NH3-N and TP).In summary,the significant spatiotemporal variations of DIC in these small ponds of agricultural watersheds were related to the inter-connected physical,chemical,and biological factors.More attention should be paid on aquatic carbon cycling in small ponds of agricultural watersheds.

关 键 词：水体碳循环 小型水体 农业活动 时空变化 

分 类 号：X522[环境科学与工程—环境工程] X524