摘要
湿地具有良好的吸收净化能力,能够有效去除水体中的氮、磷等污染物。为探究潮滩湿地削减营养盐的效果,本研究于2020年8月、11月和2021年1月、4月,对长江口南汇边滩光滩、海三棱藨草(Scirpus mariqueter)和互花米草(Spartina alterniflora)3种生境不同深度沉积物孔隙水溶解态无机氮(DIN)和溶解态无机磷(DIP)浓度进行观测,并分析其与沉积物环境因子的相关性。结果表明:植物生境沉积物孔隙水中DIN和DIP浓度显著低于光滩(P<0.05),其中互花米草生境(82.5%~97.3%)DIN相对削减率高于海三棱藨草生境(25.5%~75.8%),互花米草生境(54.1%~83.9%)DIP相对削减率高于海三棱表藨草生境(55.7%~76.4%);深层沉积物孔隙水NH_(4)^(+)-N和PO43--P浓度显著高于表层(P<0.05),而NO_(3)^(-)-N呈相反趋势。季节上,3种生境孔隙水DIN浓度均表现出夏季低、冬季高的特点,而DIP夏季浓度最高。根据相关性分析,沉积物温度、IN、AP和C/N等环境因子是影响潮滩植被营养盐削减效果的重要影响因子(P<0.05)。本研究对揭示盐沼湿地的水质净化能力具有重要参考价值。
Wetlands have strong purification capacity by reducing pollutants(such as nitrogen and phosphorus)in water.We measured the concentrations of dissolved inorganic nitrogen(DIN)and dissolved inorganic phosphate(DIP)in the porewater across four seasons at three habitats:tidal flat,Scirpus mariqueter and Spartina alterniflora in the Nanhui Shore of Yangtze Estuary.We analyzed the relationships between nutrient reduction and environmental factors in the sediment.Results showed that the concentrations of DIN and DIP in the porewater of two vegetated habitats were significantly lower than that in the tidal flat(P<0.05).The DIN relative reduction efficiency was 82.5%-97.3%in the S.alterniflora habitat,followed by S.mariqueter habitat with 25.5%-75.8%.The DIP relative reduction was 54.1%-83.9%in the S.alterniflora habitat,followed by 55.7%-76.4%in S.mariqueter habitat.The concentrations of NH_(4)^(+)-N and PO_(4)^(3-)-P in the porewater increased with depth while NO3--N concentration showed an opposite tendency.The DIN concentrations were higher in winter than that in summer,while DIP concentrations were the highest in summer.Purification capacity was primarily regulated by sediment temperature,inorganic nitrogen(IN),available phosphorous(AP),and C/N ratio.The results would help improve our understanding of water purification services provided by salt marshes.
作者
李泽渊
李秀珍
谭立山
闫中正
LI Zeyuan;LI Xiu-zhen;TAN Li-shan;YAN Zhong-zheng(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station,Ministry of Education&Shanghai Science and Technology Committee,Shanghai 200241,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2023年第2期375-385,共11页
Chinese Journal of Ecology
基金
国家重点研发计划项目(2017YFC0506000,2016YFE0133700)资助。
关键词
潮滩湿地
孔隙水
无机氮
无机磷
净化
tidal flat wetland
porewater
inorganic nitrogen
inorganic phosphorus
purification
