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我国西北地区深居内陆,加之高大地形阻挡,水汽难以到达,气候干旱形成荒漠。河流经过或地下水出露之处形成绿洲。绿洲地区光照充足,气温日较差大,有利于植物增强光合作用和积累糖分;水源是绿洲农业发展的关键条件。水源补给的减少、植被的破
Deep inland in northwestern China, coupled with high terrain blocking the water vapor is difficult to reach, arid climate desertification. The oasis is formed by the river passing through or exposed from the groundwater. Sunshine is abundant in the oasis area, and the temperature day is far worse, which helps the plants to enhance photosynthesis and accumulate sugar. The water source is the key condition for the development of oasis agriculture. Reduce the supply of water, vegetation, broken