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1危害草地的主要灾害1.1干旱灾害西部草地处于内陆的干旱半干旱地带,受海洋性气候影响较弱,年降雨量50—450mm,地下水多在50—100m之下。降水量少、外来水缺和地下水深的特点,使草地生产经常处于一种受干旱威胁的不利状态。这种缺水严重的状况给牧草生长带来了
1 Major Hazards of Harm to Grassland 1.1 Drought Disasters West grassland is arid and semi-arid landlocked inland and has a weak influence by the maritime climate with annual rainfall of 50-450mm and groundwater mostly below 50-100m. Precipitation is small, lack of external water and groundwater depth characteristics of the grassland production is often in a state of drought-threatening disadvantage. This severe water shortage has brought to the forage grass