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我国沙漠面积达109.5万平方公里,百分之九十以上分布在西北地区。这些地方自然条件比较恶劣,气候干燥,雨量稀少,风起沙扬。尤其在旱季,气温过高,水份很少,植物一般不易成活。因此,在改造沙漠以及营造绿色万里长城的进军中,如何选择适应这种生态环境的优良固沙树种,做到适地适树,就显得十分重要了。两年来,我们围绕这个问题,对西北沙荒生长的十余种树种,就其旱性结构、抗旱生理等做了一些观察研究。现将花棒、杨柴、柠条与黄柳四个树种的材料整理如下。
China’s desert area of 1.095 million square kilometers, more than 90 percent distributed in the northwest. The natural conditions in these areas are rather harsh, the climate is dry, the rainfall is scarce, and the wind rises and falls. Especially in the dry season, the temperature is too high, water is very small, plants are generally not easy to survive. Therefore, in the transformation of the desert and the green Great Wall into the march, how to choose to adapt to this ecological fine sand-fixing species, to be properly adapted to trees, it is very important. In the past two years, we have focused on this issue and made some observations on more than a dozen tree species that grow deserted in the northwest in terms of their drought-resistant structure and drought resistance. Now the flower sticks, Yang Chai, Caragana and Huang Liu four species of materials finishing as follows.