Solid water affords a new approach to drought resistant planting in arid and semi arid area.

固体水为干旱、半干旱地区的抗旱造林提供了一种新的途径。

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Northwest of China, whose area accounts for 38 percent of the total, is one of the typical arid and semi-arid zone in the world.

我国西北地区是世界上典型的干旱半干旱地区之一，占国土面积的38%。

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In the arid and semi arid area, the precipitation is little, soil moisture insufficient and low survival rate, low preserved rate and slow growing of trees.

干旱半干旱区降水少，土壤水分亏缺，林木成活率低、保存率低、生长缓慢。

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