Studies on spatial pattern of NDVI over India and its relationship with rainfall, air temperature, soil moisture adequacy and ENSO/O prostornoj razdiobi normiranog diferencijalnog vegetacijskog indeksa nad Indijom i njegova veza s oborinom, temperaturom zraka, dostatnoscu vlaznosti tla i ENSO pojavom

The changes in spatial distribution of Advanced Very High Resolution Radiometer (AVHRR) Normalized Difference Vegetation Index (NDVI) are studied for different seasons in India for the period 1982 to 2000. The inter-annual variability of All India NDVI (AINDVI) has been studied and related to rainfall, air temperature, soil moisture adequacy, Southern Oscillation Index (SOI) and Nino 3 Sea Surface Temperature (Nino 3 SST) to understand the influence of these variables on vegetal cover. The results show that the NDVI is high during the south-west (June to September) monsoon and retreat (October and November) seasons where in major crop seasons Kharif and Rabi take place over India. The trend of AINDVI is increasing and displayed higher values during La Nina and lower in El Nino episodes. The correlation between rainfall and NDVI of All India is not significant on monthly basis (+0.13) but it is more prominent when the cumulative annual amounts of rainfall are involved (+0.61). NDVI responded very well to the variations of soil moisture adequacy ([S.sub.AD]) which enumerates the strongest correlation (+0.73) of crop performance with NDVI. This significant strong correlation inferred that [S.sub.AD] can be taken as the indicator for the NDVI variations rather rainfall. The linear regression analysis of AINDVI and the ENSO indices revealed the strong impact of sea surface temperatures than SOI on vegetation pattern over India. Keywords: NDVI, inter-annual variability, rainfall, air temperature, soil moisture adequacy and ENSO Promjene prostorne raspodjele normiranog diferencijalnog vegetacijskog indeksa (NDVI) dobivenog na temelju mjerenja radiometrom vrlo visoke rezolucije (AVHRR) proucavane su za razlicite sezone na podrucju Indije tijekom razdoblja od 1982. do 2000. godine. Promatrana je medugodisnja promjenjivost NDVI-a izracunatog za cijelo podrucje Indije (AINDVI) te njegova povezanost s oborinom, temperaturom zraka, dostatnoscu vlaznosti tla, indeksom Juzne oscilacije (SOI) te Nino 3 povrsinskom temperaturom mora (Nino 3 SST) kako bi se utvrdila povezanost tih varijabli i vegetacijskog pokrova. Rezultati pokazuju da NDVI poprima visoke vrijednosti tijekom sezone jugozapadnih monsuna (od lipnja do rujna) te tijekom prijelazne sezone povlacenja monsuna (listopad i studeni) sto se uglavnom podudara sa zetvenim sezonama Kharif i Rabi. NDVI ima pozitivan trend te poprima vise vrijednosti tijekom La Nina, a nize vrijednosti tijekom El Nino dogadaja. Iako kore