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Open AccessArticle

Net Ecosystem Exchange of CO2 in Deciduous Pine Forest of Lower Western Himalaya, India

1
Centre for Glaciology, Wadia Institute of Himalayan Geology, Dehradun 248001, India
2
Department of Geoinformatics, School of Natural Resource Management, Central University of Jharkhand, Ranchi 835205, India
3
Forest Research Institute, Dehradun 248001, India
4
Indian Institute of Remote Sensing, Dehradun 248001, India
*
Author to whom correspondence should be addressed.
Resources 2019, 8(2), 98; https://doi.org/10.3390/resources8020098
Received: 19 April 2019 / Revised: 14 May 2019 / Accepted: 17 May 2019 / Published: 20 May 2019
Carbon cycle studies over the climate-sensitive Himalayan regions are relatively understudied and to address this gap, systematic measurements on carbon balance components were performed over a deciduous pine forest with an understory layer. We determined annual net carbon balance, seasonality in components of carbon balance, and their environmental controls. Results indicated a strong seasonality in the behavior of carbon exchange components. Net primary productivity (NPP) of pine forest exceeded soil respiration during the growing phase. Consequently, net ecosystem exchange exhibited a net carbon uptake. In the initial phase of the growing season, daily mean uptake was −3.93 (±0.50) g C m−2 day−1, which maximizes (−8.47 ± 2.3) later during post-monsoon. However, a brief phase of carbon release was observed during peak monsoon (August) owing to an overcast condition. Nevertheless, annually the forest remained as a carbon sink. The understory is extensively distributed and it turned out to be a key component of carbon balance because of sustained NPP during the pine leafless period. Temperature and evaporative fraction exhibited a prime control over the seasonal carbon dynamics. Our observations could lend certain useful insights into the application of coupled climate-carbon cycle models for the Himalaya and ecological functions in the region. View Full-Text
Keywords: net primary productivity; soil respiration; carbon use efficiency; Pinus roxburghii; understory; subtropical Himalaya net primary productivity; soil respiration; carbon use efficiency; Pinus roxburghii; understory; subtropical Himalaya
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MDPI and ACS Style

Singh, N.; Parida, B.R.; Charakborty, J.S.; Patel, N. Net Ecosystem Exchange of CO2 in Deciduous Pine Forest of Lower Western Himalaya, India. Resources 2019, 8, 98.

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