CLIMATIC DYSFUNCTIONALITIES OBSERVED WITH THE AID OF NDMI AND SAVI INDICES IN THE LEU-ROTUNDA AND DĂBULENI PLAINS
FLORINA CRISTINA ROȘCA
ABSTRACT. – Climatic dysfunctionalities observed with the aid of NDMI and SAVI Indices in the Leu-Rotunda and Dăbuleni Plains. Integrant parts of the Romanați Plain, located in the southern region of the country, in the great Romanian Plain, the Leu-Rotunda and Dăbuleni Plains respectively, are arising big issues regarding the agricultural landscape, mainly due to the climatic failures which affect, in turn, the whole of Romania, but not only. So, according to the De Martonne Aridity Index, the monthly character spanning over a year period recorded at the three stations varied between humid, semi – humid and steppe.
With the help of the vegetation differentiation indices calculated based on the Landsat type satellite images, at a 30 m resolution, an attempt in the observation of the existing modifications in this area, which was profoundly affected by the aridity in the 1985-2010 periods, is being made. The NDMI (Normalized Difference Moisture Index) index is expressing the differentiated humidity content at landscape element level, especially regarding soil and vegetation. The SAVI (Soil-Adjusted Vegetation Index) index comes to reduce the effect caused by the soil illumination conditions, these conditions playing a big role in the analyzed area mainly due to the fact that the dominant soil type has a sandy texture.
Keywords: Leu-Rotunda and Dăbuleni Plains, De Martonne Aridity Index, NDMI, SAVI