Analysis of Vegetation Behavior in a North African Semi-Arid Region, Using SPOT-VEGETATION NDVI DataReport as inadecuate


Analysis of Vegetation Behavior in a North African Semi-Arid Region, Using SPOT-VEGETATION NDVI Data


Analysis of Vegetation Behavior in a North African Semi-Arid Region, Using SPOT-VEGETATION NDVI Data - Download this document for free, or read online. Document in PDF available to download.

1

CESBIO CNRS, IRD, CNES, UPS, 18 Avenue Edouard Belin, bpi 2801, 31401 Toulouse cedex 9, France

2

INAT, 43, Avenue Charles Nicolle 1082, Tunis-Mahrajène, Tunisia





*

Author to whom correspondence should be addressed.



Abstract The analysis of vegetation dynamics is essential in semi-arid regions, in particular because of the frequent occurrence of long periods of drought. In this paper, multi-temporal series of the Normalized Difference of Vegetation Index NDVI, derived from SPOT-VEGETATION satellite data between September 1998 and June 2010, were used to analyze the vegetation dynamics over the semi-arid central region of Tunisia. A study of the persistence of three types of vegetation pastures, annual agriculture and olive trees is proposed using fractal analysis, in order to gain insight into the stability-instability of vegetation dynamics. In order to estimate the state of vegetation cover stress, we propose evaluating the properties of an index referred to as the Vegetation Anomaly Index VAI. A positive VAI indicates high vegetation dynamics, whereas a negative VAI indicates the presence of vegetation stress. The VAI is tested for the above three types of vegetation, during the study period from 1998 to 2010, and is compared with other drought indices. The VAI is found to be strongly correlated with precipitation. View Full-Text

Keywords: vegetation; SPOT-VEGETATION; NDVI index; drought; persistence; Vegetation Drought Index vegetation; SPOT-VEGETATION; NDVI index; drought; persistence; Vegetation Drought Index





Author: Rim Amri 1,2, Mehrez Zribi 1,* , Zohra Lili-Chabaane 2, Benoit Duchemin 1, Claire Gruhier 1 and Abdelghani Chehbouni 1

Source: http://mdpi.com/



DOWNLOAD PDF




Related documents