摘要
为了明确富营养化浅水湖泊中不同聚集厚度藻类分解过程对碳、氮和磷的产生及温室气体释放的影响,本研究通过室内模拟的方法,研究了不同聚集厚度(3 cm、5 cm、10 cm、15 cm和20 cm)藻类衰亡分解过程中碳、氮和磷的迁移特征及温室气体产生的规律.结果表明,在藻类衰亡分解过程中,藻聚集厚度20 cm时水体溶解性有机碳(TOC)浓度值最高;同时,随着藻类聚集厚度的增加,各处理组中总氮(TN)、总磷(TP)和铵态氮(NH_(4)^(+)-N)的浓度均表现出先上升后下降的趋势.气态碳以CH_(4)和CO_(2)形式排放到大气中,培养结束时,藻聚集厚度20 cm处理组中CH_(4)和CO_(2)排放通量最大,分别为58.85 mg·m^(-2)·h^(-1);和489.18 mg·m^(-2)·h^(-1);此外,N_(2)O的排放通量随着藻聚集厚度的增加而增加.实验过程中,水体中NH_(4)^(+)-N与各处理组CO_(2)、CH_(4)和N_(2)O的排放通量均显著相关(P<0.05).本研究揭示了藻类聚集厚度与水体中碳、氮、磷的浓度及CO_(2)、CH_(4)和N_(2)O 3种温室气体释放呈显著正相关关系,且能在一定程度上加速湖泊富营养化.
In order to clarify the effects of algae decomposition processes with different aggregation thicknesses on carbon,nitrogen,phosphorus production,and greenhouse gas emission in eutrophic shallow lakes,the migration characteristics of carbon,nitrogen,and phosphorus and the rules of greenhouse gas production during the decay and decomposition of algae with different aggregation thicknesses(3 cm,5 cm,10 cm,15 cm and 20 cm)were studied by indoor simulation.The results showed that the concentration of dissolved organic carbon(TOC)was the highest when the thickness of algae was 20 cm.At the same time,the concentrations of total nitrogen(TN),total phosphorus(TP),and ammonium nitrogen(NH_(4)^(+)-N)in each treatment group increased firstly and then decreased with the increase of algae aggregation thickness.Gaseous carbon was discharged into the atmosphere in the form of CH_(4) and CO_(2).At the end of culture,the CH_(4) and CO_(2) emission fluxes were the highest in the 20 cm algae aggregation thickness group,which were 58.85 mg·m^(-2)·h^(-1) and 489.18 mg·m^(-2)·h^(-1),respectively.In addition,the emission fluxes of N_(2)O increased with the increase of algal aggregation thickness.During the experiment,NH_(4)^(+)-N in water was significantly correlated with the emission fluxes of CO_(2),CH_(4),and N_(2)O in each treatment group(P<0.05).This study revealed that the concentration of carbon,nitrogen,and phosphorus in water and the release of CO_(2),CH_(4),and N_(2)O greenhouse gases were significantly positively correlated with the thickness of algae aggregation,and could accelerate lake eutrophication to a certain extent.
作者
严岩
吴懿婷
周川乔
马天
许晓光
邓杨
Yan Yan;Wu Yiting;Zhou Chuanqiao;Ma Tian;Xu Xiaoguang;Deng Yang(Jiangsu Provincial Academy of Environmental Science,Nanjing 210036,China;School of Environment,Nanjing Normal University,Nanjing 210023,China)
出处
《南京师大学报（自然科学版）》
CAS
CSCD
北大核心
2022年第2期142-148,共7页
Journal of Nanjing Normal University(Natural Science Edition)
基金
国家水体污染控制与治理科技重大专项(2017ZX07203-003)
国家自然科学基金青年基金资助项目(41907350)
江苏省普通高校研究生科研创新计划项目(KYCX21_1397).
关键词
藻类
碳
氮
磷
温室气体
algae
carbon
nitrogen
phosphorus
greenhouse gases
作者简介
通讯作者:邓杨,博士,研究方向:气候变化与浅水湖泊生物地球化学.E-mail:15651922179@163.com。
