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白榆是我县四旁主要速生用材树种之一。据我县自然区划统计有280万株,按数量居各树种之首。由于白榆长期采用种子繁殖造林,个体间遗传差异大,出材率低,亟需进行白榆的遗传改良。1973—1979年,我们先后选出白榆表型优树5株,1981年3月同我省其它地方选出的表型优树一起在我所营造了我省第一个“白榆无性系测验林”。通过对比试验,从中筛选出具有优良遗传基础的8052、8033等优良无性系并进行了示范推广,现将5年来“白榆无性系测验林”试验结果报告如下:
White elm is one of the major fast-growing timber species on four sides of my county. According to my county natural zoning statistics 2.8 million, according to the number of species in the first. As Ulmus long-term use of seed propagation afforestation, genetic differences between individuals, a low yield, the urgent need for genetic improvement of Ulmus. From 1973 to 1979, we selected five elm trees of elm phenotype successively. In March 1981, together with the elite tree of phenotype selected in other parts of our province, we created the first “elm boll forest” “. Through comparative experiments, we selected the fine clones 8052 and 8033 with excellent genetic basis and carried out the demonstration and popularization. The test results of ”Ulmus pumila" in five years are reported as follows: