N Regina Hershey1,2, S Bijoy Nandan3, K Neelima Vasu2, Douglas R Tait4,5. 1. Department of Zoology, N.S.S. Hindu College, Changanassery, 686 102, India. 2. Department of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology, Cochin, 682 016, India. 3. Department of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology, Cochin, 682 016, India. bijoynandan@yahoo.co.in. 4. Faculty of Environment and Science, Southern Cross University, Lismore, NSW, 2480, Australia. 5. National Marine Science Centre, Southern Cross University, PO Box 4321, Coffs Harbour, NSW, 2450, Australia.
Abstract
Fragmented mangroves are generally ignored in N2O flux studies. Here we report observations over the course of a year from the Mangalavanam coastal wetland in Southern India. The wetland is a fragmented mangrove stand close to a large urban centre with high anthropogenic nitrogen inputs. The study found the wetland was a net source of N2O to the atmosphere with fluxes ranging between 17.5 to 117.9 µmol m-2 day-1 which equated to high N2O saturations of between 697 and 1794%. The average dissolved inorganic nitrogen inputs (80.1 ± 18.1 µmol L-1) and N2O emissions (59.2 ± 30.0 µmol m-2 day-1) were highest during the monsoon season when the rainfall and associated river water inputs and terrestrial runoff were highest. The variation in N2O dynamics was shown to be driven by the changes in rainfall, water column depth, salinity, dissolved oxygen, carbon, and substrate nitrogen. The study suggests that fragmented/minor mangrove ecosystems subject to high human nutrient inputs may be a significant component of the global N2O budget.
Fragmented mangroves are generally ignored in N2O flux studies. Here we report observations over the course of a year from the n class="Chemical">Mangalavanam coastal wetland in Southern India. The wetland is a fragmented mangrove stand close to a large urban centre with high anthropogenic nitrogen inputs. The study found the wetland was a net source of N2O to the atmosphere with fluxes ranging between 17.5 to 117.9 µmol m-2 day-1 which equated to high N2O saturations of between 697 and 1794%. The average dissolved inorganicnitrogen inputs (80.1 ± 18.1 µmol L-1) and N2O emissions (59.2 ± 30.0 µmol m-2 day-1) were highest during the monsoon season when the rainfall and associated river water inputs and terrestrial runoff were highest. The variation in N2O dynamics was shown to be driven by the changes in rainfall, water column depth, salinity, dissolved oxygen, carbon, and substrate nitrogen. The study suggests that fragmented/minor mangrove ecosystems subject to high human nutrient inputs may be a significant component of the global N2O budget.
Authors: Alessandra Marzadri; Martha M Dee; Daniele Tonina; Alberto Bellin; Jennifer L Tank Journal: Proc Natl Acad Sci U S A Date: 2017-04-11 Impact factor: 11.205
Authors: A V Borges; F Darchambeau; T Lambert; S Bouillon; C Morana; S Brouyère; V Hakoun; A Jurado; H-C Tseng; J-P Descy; F A E Roland Journal: Sci Total Environ Date: 2017-08-11 Impact factor: 7.963
Authors: Sheryl Oliveira Fernandes; P A Loka Bharathi; Patricia C Bonin; Valérie D Michotey Journal: J Environ Qual Date: 2010 Jul-Aug Impact factor: 2.751
Authors: Douglas R Tait; Damien T Maher; WeiWen Wong; Isaac R Santos; Mahmood Sadat-Noori; Ceylena Holloway; Perran L M Cook Journal: Environ Sci Technol Date: 2017-11-22 Impact factor: 9.028