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汶川干旱河谷,地处川西北高山峡谷区,四周山高坡陡,山岭与谷底相对高差1500—2500米,由于地形地貌影响,植被破坏时间较长,河谷气候干燥形成十年九旱,土壤瘠薄干旱,焚风效应、山谷风盛行、植被稀疏,荒山面积大,解放后,汶川县威州林场在低山河谷地带进行了人工造林,因受自然条件影响,造林成活率低。为研究汶川地区造林技术,给飞机播种造林提供依据,我们于1979年3月在这一地区进行人工撒播松树试验,现将资料整理如下:
Wenchuan arid valley, is located in the northwestern Sichuan high mountain gorge area, surrounded by steep mountain slopes, mountain and bottom of the relative elevation 1500-2500 meters, due to the topography, vegetation damage longer, the valley dry climate ten years nine drought, soil infertility After the liberation, the Wei-Lin Forest Farm in Wenchuan County conducted artificial afforestation in the low-lying valley. Due to the natural conditions, the survival rate of afforestation was low. In order to study afforestation technology in Wenchuan area and provide evidence for aircraft sowing and afforestation, we conducted a manual sowing pine test in this area in March 1979. The data are summarized as follows: