Abstract
Monthly images of Normalized Difference Vegetation Index (NDVI) from the moderate resolution imaging spectroradiometer (MODIS) are used to characterize the spatio-temporal variability of vegetation in a large South American wetland (SAW) (located in the Paraná River floodplain) during the period 2000-2009. While these data do not meet the requirements of classical component extraction techniques (CETs) (e.g. principal component analysis (PCA)), they are suitable for the modern method named independent component analysis (ICA). Hence, ICA is used here to extract three statistically independent modes of inter-annual MODIS-NDVI variability that are successfully interpreted as vegetation responses to hydrological changes. One mode isolates the vegetation response to a severe drought associated with La Niña 2007-2008. Another component reflects the expansion (or contraction) of lagoons owing to high (or low) water level of the Paraná River. The remaining mode captures the vegetation decrease caused by the flood related to El Niño 2006-2007. The results presented here for a particular wetland suggest that ICA of NDVI images is a powerful tool for identifying the physical causes of vegetation changes in other large wetlands. © 2011 Taylor & Francis.
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Claims 4
Claim · model-written summary
ICA extracted three interpretable modes of vegetation response to hydrological change.
Verbatim
e0“ICA is used here to extract three statistically independent modes of inter-annual MODIS-NDVI variability that are successfully interpreted as vegetation responses to hydrological changes”
Claim · model-written summary
One mode isolated a vegetation response to severe La Niña drought in 2007-2008.
Verbatim
e0“One mode isolates the vegetation response to a severe drought associated with La Niña 2007-2008”
Claim · model-written summary
A component reflected lagoon expansion or contraction with Paraná River water level.
- Outcome
- expansion (or contraction) of lagoonse0
- Comparator
- high (or low) water levele0
- Setting
- Paraná Rivere0
Not reportedTaxon
Verbatim
e0“Another component reflects the expansion (or contraction) of lagoons owing to high (or low) water level of the Paraná River”
t0“wetland”
Claim · model-written summary
One mode captured vegetation decrease during the El Niño 2006-2007 flood.
Verbatim
e0“The remaining mode captures the vegetation decrease caused by the flood related to El Niño 2006-2007”