14 seed source of Cathay Poplar have been cultivated test for 12years. In the end 7 seed source of Cathay Poplar are selected. Their character better than Cathay Poplar in Xining.

• 通过对14个青杨种源12a的栽植试验,筛选出7个表现优于西宁青杨的青杨种源,其中,耿镇青杨苗高增益达到39%25。