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刺槐是耐干旱,耐盐碱,适应性强,长生快,材质坚硬的优良树种.1958年以来,我县在西部、西北部的丘陵岗地,先后营造了以刺槐为主的用材林7万余亩.目前这些刺槐林分长势不良,高、粗生长非常缓慢,有30—40%林木,胸径只有6—8厘米,树高只有5米左右,并出现枯梢、断头、主干弯曲等现象,群众称之为刺槐“小老树”.为了摸索形成“小老树”的原因,我们对石湖林场刺槐“小老树”林地的土壤情况进行了调查,并结合本县气象资料作了分析,现报告如下:
Robinia pseudoacacia is a good tree species with drought resistance, saline-alkali resistance, strong adaptability, fast growth, and hard material. Since 1958, our county has built more than 70,000 mu of timber forest with Robinia pseudoacacia mainly in hilly land in the west and northwest, At present, these Robinia pseudoacacia stands have a long way to go, with high growth and slow growth. With 30-40% of the trees, the diameter at breast height is only 6-8 centimeters and the tree height is only about 5 meters. The masses call it “small old tree.” In order to explore the reason for the formation of “small old tree,” we investigated the soil condition of “small old tree” of acacia in Shihu Forest Farm and analyzed the meteorological data , The report is as follows: