Spatial variability of atmosphere-biosphere CO2 and H2O exchange in selected sites of Indian Sundarbans during summer

Abhra Chanda*, Anirban Akhand, Sudip Manna, Sachinandan Dutta, Indrani Das, Sugata Hazra

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Spatial variability of atmosphere-biosphere CO2 exchange was evaluated in Jharkhali, Bonnie Camp and Henry Island situated, respectively, in the inner, middle and outer estuarine part of Indian Sundarban mangrove ecosystem using micrometeorological methods, between 15th April and 15th May, 2011. Henry Island and Jharkhali acted as a sink for CO2 with a rate of 18.94 g m-2 d-1 and 51.06 g m-2 d-1, respectively, whereas the sink strength of Bonnie camp was 1.51 g m-2 d-1. A positive correlation was obtained between solar radiation and 'atmosphere to biosphere' CO2 flux. Varying magnitudes in leaf chlorophyll may be another decisive factor controlling CO2 exchange. Greater chlorophyll content of the dominant species of a site leads to higher photosynthetic rate and hence increases the magnitude of 'atmosphere to biosphere' CO2 influx. A mean daytime water vapor flux of 7.83 ± 4.95 m mol m-2 s-1 and a nighttime of 3.38 ± 3.32 m mol m-2 s-1 was observed at the three sites. The observed Bowen ratio values reflected a dominance of latent heat flux, compared to that of sensible heat flux in this ecosystem. The ecosystem on the whole acted as a sink for CO2 (23.83 g m-2 d-1) but the magnitude of CO2 influx was found to vary spatially.

Original languageEnglish
Pages (from-to)167-178
Number of pages12
JournalTropical Ecology
Volume54
Issue number2
Publication statusPublished - May 2013

Keywords

  • Bowen ratio
  • Carbon dioxide flux
  • Diurnal variation
  • Mangrove forest
  • Spatial variation
  • Sundarban
  • Vertical CO profile
  • Water vapor flux

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science

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