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循化县林学会1983年在积石镇定植了新疆杨、北京杨对比试验林。经连续九年观察,结果表明,在该地区新疆杨比北京杨具有明显的生长优势。如表。
In 1983, Xunhua County Forestry Society planted Xinjiang Yang and Beijing Yang Comparative Experimental Forest in Jishi. After nine consecutive years of observation, the results show that in this region, Xinjiang Yang than Beijing Poplar has obvious growth advantages. As table.