The satellite
Enhanced Vegetation Index (EVI) from the NASA Moderate-resolution Imaging
Spectroradiometer (MODIS) over the years 2000 to 2016 was used to study impacts
of the historic 2013-2015 drought period on woodland ecosystems of the Carmel
River watershed in central California.
EVI time series
analysis supplemented with in situ measurements of soil moisture showed
that the historic drought period of 2013-2015 had
contrasting effects on different oak woodland types.
The correlation
of water year anomaly for precipitation amounts since the year 2000 with peak
seasonal EVI was higher for deciduous oak stands than for the evergreen oak
stands. Among woodland cover types, only peak deciduous woodland EVI increased
significantly again across the watershed during the near-normal water year of
2016 following the 2013-2015 extreme drought period.
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