Evaluation of Aridity Indices Using SPOT Normalized Difference Vegetation Index Values Calculated Over Different Time Frames on Iberian Rain-Fed Arable Land

Autor:	Valentinas Juškevičius, Attila Bussay, Tibor Tóth, Lorenzo Seguini
Rok vydání:	2012
Předmět:	Hydrology Biomass (ecology) Crop yield Soil Science Enhanced vegetation index Arid Normalized Difference Vegetation Index medicine Environmental science Dryness Aridity index Physical geography medicine.symptom Arable land
Zdroj:	Arid Land Research and Management. 26:271-284
ISSN:	1532-4990 1532-4982
DOI:	10.1080/15324982.2012.694398
Popis:	The objective of this study was to find the best-performing aridity index and time-frame in the Iberian Peninsula characterizing the effect of dryness on agricultural production. To achieve this goal time-series of 5 aridity indices for 1998 October–2009 December time-period were calculated on a 25 × 25 km grid, and the closest relationship with plant biomass was determined. Plant biomass was represented by the SPOT-VEGETATION Normalized Difference Vegetation Index (NDVI) satellite data masked out for rain-fed arable land for the period between 1998 and 2009, and also by official yield statistics of Spain and Portugal between 1999 and 2009. Aridity indices calculated for time frames matching the entire vegetative period resulted in the highest correlation coefficients with NDVI and with the crop yield. There was a difference between the two time frames covering twelve months. In contrast with the calendar year, using the hydrological year (1 October–30 September) ensured a very strong correlation between ...
Databáze:	OpenAIRE
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