Document Type : Research Paper

Author

• Bahman Ramezani

Assistant Professor, Islamic Azad University of Rasht

Abstract

Shortage of water resources and climatic limitations of the period of plants’ growth, excessive precipitation and lack of enough precipitation lead to drought or, in other words, decrease of agricultural products. This topic is considered from different points of view by experts of different fields, but in general it is considered as a natural phenomenon with many effects on the environment.
According to a study of the temperature-precipitation trend over a certain statistical period at twelve stations, impact of drought is gradually appearing, and alleviating measures cannot be a real cure for this climatic factor. Evidences show that the length of the active thermal period of crops’ growth, extra precipitation and temperature variations in the region are gradually undergoing significant changes, and, considering population increase and limitations of soil, they might bring about numerous environmental problems in future.
The present study is a part of a research plan, still in the process of edition, which analyses the trend of change of above factors using mini-tab software and predictive maps of probabilities with different periods. The aim of this study is to identify the trends and to provide with a vision of future, so that due measurements for dealing with this issue (drought and its environmental effects) in a humid climate or area can be duly considered by local planners.

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