Milk Production as an Indicator of Drought Vulnerability of Cities Located in the Brazilian Semiarid Region

Abstract

Several spectral indices have been used to estimate droughts, however, these indicators only give evidence of a dry spell leaving out its impacts on significant economic activities performed in a given region. In this context, livestock breeding in one of the most important activities to analyze in the Brazilian semiarid region. The aim of this study was to evaluate the relationship between the drought indices, obtained through remote sensory devices, and annual milk production (2004 -2014), identifying the most affected cities by the drought and were considered the most vulnerable and in need of special attention during dry periods. In order to analyze the data, the hierarchical grouping technique and correlation analyses between milk production and VCI -Vegetation Condition Index, TCI -Temperature Condition Index, VHIVegetation Health Index, PCI -Precipitation Condition Index and SDCI -Scaled Drought Condition indices were used. The intense correlation between milk production and the drought indices may be related to the dependency of the cities' economies on natural resources. On the other hand, the diversification of the cities' economic activities may enable access to various resources and drought vulnerability reduction.