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Estimating gross primary productivity of a tropical forest ecosystem over north-east India using LAI and meteorological variables

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Abstract

Tropical forests act as a major sink of atmospheric carbon dioxide, and store large amounts of carbon in biomass. India is a tropical country with regions of dense vegetation and high biodiversity. However due to the paucity of observations, the carbon sequestration potential of these forests could not be assessed in detail so far. To address this gap, several flux towers were erected over different ecosystems in India by Indian Institute of Tropical Meteorology as part of the MetFlux India project funded by MoES (Ministry of Earth Sciences, Government of India). A 50 m tall tower was set up over a semi-evergreen moist deciduous forest named Kaziranga National Park in north-eastern part of India which houses a significant stretch of local forest cover. Climatically this region is identified to be humid sub-tropical. Here we report first generation of the in situ meteorological observations and leaf area index (LAI) measurements from this site. LAI obtained from NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) is compared with the in situ measured LAI. We use these in situ measurements to calculate the total gross photosynthesis (or gross primary productivity, GPP) of the forest using a calibrated model. LAI and GPP show prominent seasonal variation. LAI ranges between 0.75 in winter to 3.25 in summer. Annual GPP is estimated to be \(2.11\,\hbox {kg C m}^{-2} \, \hbox {year}^{-1}\).

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Acknowledgements

Our sincere gratitude to the Director, IITM for all his constant encouragement and support. We thank all the members of the project team for all possible help. CCCR (Centre for Climate Change Research) is part of Indian Institute of Tropical Meteorology, Pune (IITM) and is fully supported by the Earth System Science Organization (ESSO) of Ministry of Earth Sciences (MoES), Government of India. A special thanks to Dr. Stephan Matthiesen, GAUGE (Greenhouse gAs Uk and Global Emissions) UK for conducting International Summer School on global greenhouse gases in 2016.

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Authors and Affiliations

  1. Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, 411 008, India

    Pramit Kumar Deb Burman & Supriyo Chakraborty

  2. Department of Environmental Sciences, Tezpur University, Tezpur, 784 028, India

    Dipankar Sarma

  3. School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FF, UK

    Mathew Williams

  4. Department of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune, 411 007, India

    Anandakumar Karipot

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  1. Pramit Kumar Deb Burman
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Correspondence to Pramit Kumar Deb Burman.

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Deb Burman, P.K., Sarma, D., Williams, M. et al. Estimating gross primary productivity of a tropical forest ecosystem over north-east India using LAI and meteorological variables. J Earth Syst Sci 126, 99 (2017). https://doi.org/10.1007/s12040-017-0874-3

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