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Trends and Variability of AVHRR-Derived NPP in India

Bala, Govindasamy and Joshi, Jaideep and Chaturvedi, Rajiv Kumar and Gangamani, Hosahalli V and Hashimoto, Hirofumi and Nemani, Rama (2013) Trends and Variability of AVHRR-Derived NPP in India. In: REMOTE SENSING, 5 (2). pp. 810-829.

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Official URL: http://dx.doi.org/10.3390/rs5020810

Abstract

In this paper, we estimate the trends and variability in Advanced Very High Resolution Radiometer (AVHRR)-derived terrestrial net primary productivity (NPP) over India for the period 1982-2006. We find an increasing trend of 3.9% per decade (r = 0.78, R-2 = 0.61) during the analysis period. A multivariate linear regression of NPP with temperature, precipitation, atmospheric CO2 concentration, soil water and surface solar radiation (r = 0.80, R-2 = 0.65) indicates that the increasing trend is partly driven by increasing atmospheric CO2 concentration and the consequent CO2 fertilization of the ecosystems. However, human interventions may have also played a key role in the NPP increase: non-forest NPP growth is largely driven by increases in irrigated area and fertilizer use, while forest NPP is influenced by plantation and forest conservation programs. A similar multivariate regression of interannual NPP anomalies with temperature, precipitation, soil water, solar radiation and CO2 anomalies suggests that the interannual variability in NPP is primarily driven by precipitation and temperature variability. Mean seasonal NPP is largest during post-monsoon and lowest during the pre-monsoon period, thereby indicating the importance of soil moisture for vegetation productivity.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to MDPI AG, SWITZERLAND.
Keywords: AVHRR-derived NPP;vegetation productivity;CO2 fertilization;afforestation;soil water;atmospheric CO2
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Division of Mechanical Sciences > Divecha Centre for Climate Change
Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Depositing User: Francis Jayakanth
Date Deposited: 28 Mar 2013 12:06
Last Modified: 28 Feb 2019 08:59
URI: http://eprints.iisc.ac.in/id/eprint/46250

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