THE COLD AND HOT DAMAGES TO THE CITRUS IN THE THREE GORGES AREA OF THE CHANGJIANG RIVER

Starting from the research on and collection of the damaging factors and index of the cold and hot damages to citrus, this peper systematically studies the apparent properties in temporal and spatial distribution, differences, relationship of the two kinds of disasters and their impact on citrus production in the Three Gorges area in Hubei. It also reveals the important fact that it is warmer in winter and hotter in spring since the 1980s, which is the cause of departing to two poles of the cold and hot damages, and discusses the alleviating effect to the disasters by the Three Gorges Project.Finally some countermeasures are proposed.