• Login
    View Item 
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Nitrate levels modulate denitrification activity in tropical mangrove sediments (Goa, India)

    Thumbnail
    View/Open
    Environ_Monit_Assess_173_117a.pdf (231.1Kb)
    Date
    2011
    Author
    Fernandes, S.O.
    LokaBharathi, P.A.
    Metadata
    Show full item record
    Abstract
    A study to examine the short-term effect of nitrate and organic carbon addition on denitrification activity was carried out on sediments from a mangrove ecosystem prone to anthropogenic activities (Divar, Goa, India). Laboratory microcosms were prepared using sediment sectioned at every 2-cm-depth interval from the surface to 10 cm. The incubations were subjected to varying nitrate amendments at concentrations ranging from 0, 5, 10, 20, 40 to 60 mu mol l sup(-1) (up to three times more than measured in field). Nitrous oxide production rates increased significantly (n=15; p less than 0.001) on addition of the nutrient at all depths investigated indicating that denitrification in mangrove sediments was NO sup(-) sub (3) limited. Incubations amended with organic carbon were prepared using glucose as a substrate with concentrations ranging from 0%, 0.1%, 0.3%, 0.5%, 0.75% to 1%. No significant increase in N2O production was observed on organic C addition. When both the substrates were in excess (1 mmol KNO sub(3) +1 mmol glucose), potential denitrification rates decreased with depth and were up to 38 times higher than the in situ denitrification activity varying from 81.26 to 304.09 mu mol N sub(2) O-N m sup(-2) h sup(-1). These results reveal that mangrove sediments could act as a sink for nitrate and microbially mediated denitrification could effectively reduce N load controlling any adverse environmental impact in the adjoining estuarine system
    URI
    http://drs.nio.org/drs/handle/2264/3778
    Collections
    • Scholarly literature [9074]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV