Peddinti, Srinivasa Rao and K B V N, Phanindra and Adinarayana, J and et al, .
(2018)
Evaluation of Landsat derived water use efficiency for citrus orchards of central India.
In: AFITA/WCCA Conference, 24-26 October 2018, Bombay, India.
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Abstract
This research aims at assessing the spatiotemporal patterns of water use efficiency (WUE) obtained from Landsat 8 products and to validate the results with eddy covariance (EC) measurements within the footprint area. We also correlated vegetation indices such as NDVI and EVI with Landsat derived WUE fluxes. METRIC and VPM algorithms were used to estimate ET and GPP fluxes respectively. Temporally, WUE showed a pronounced seasonal pattern starting from initial to crop development stage with clear sitinction between dry and wet seasons in the region. A decrease in WUE was observed during the dry season, which was related to the low water availability and increased vapour pressure deficit during the dry period, which induces stomatal closure, leading to a decline in the photosynthetic rate. Both EVI and NDVI showed good agreement with WUE during the crop growth stages from initial to crop development to harvesting
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