In the context of sustainable development and the recent climate warming in the semi-arid region of Djelfa whose vegetal production of pastors depends solely on rainfall, analyses of the rainfall data for the last 42 years were mandatory basing on the coefficient of variation CV, the precipitation concentration index PCI, simple linear regression, Mann Kendall test, Sen’s slope and finally the homogeneity tests. As results, a drastic variability was recorded for all the monthly and annual rainfall from year to another with no seasonality; namely a strong hydric stress would threaten plants subsistence and cause summer flood that destroys soil. Moreover, an annual decreasing was due to almost of months decreases particularly winter and spring. However, August, September and October recorded slight increases to let expect an eventual autumnal advance in August instead of September. This goes along with trend results whose the maximal decreasing trend was in November,then January. However, the increasing trend was the most in August, and July had also an increasing trend. In fact, the significant decreases were due in part to the abrupt decreases almost in winter then spring. Under the desertification threat, this drought and the drastic hydric stress make a real challenge to development.


Climate change, steppe, Mann Kendall, Sen’s slope, homogeneity, Coefficient of variation (CV), Precipitation concentration index (PCI).

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