大连地区杨树新品种引种造林试验初报

为改善大连地区杨树品种结构，提高杨树生产力，从国内外引进了12个杨树新品种，建立了试验对比林，进行了优良品种的选择研究。对试验林中9年生杨树新品种生长量进行了分析比较；对5年生各品种受蛀干害虫为害程度进行了调查和分析，并调查了各品种的适应性。结果表明：不同品种生长差异较大，其中欧美杨108单株材积生长量最大，为0．238m^３其次欧美杨107为0．218m^3超过平均材积生长量的还有中林299、I-214、中林46、9205杨；在材积生长较快的6个品种中受害较轻的为欧美杨108和107、中林299，受害中等程度的为I-214、中林46，受害较重的为9205杨；欧美杨108和107对土壤的适应性较强，所有品种均无冻害发生，据此初步选出在大连地区表现最好的2个品种即欧美杨108和107，作为重点推广品种；表现较好的3个品种即中林299、I-214、中林46，作为一般推广品种。

Experiment on Introduction of New Poplar Cultivars in Dalian

In order to ameliorate the breed structure of poplars in Dalian and improve the productivity of poplars,12 new poplar breeds were introduced into Dalian from abroad and the experimental and comparative forests were built. The excellent breeds, have been chosen and researched,the growth of the new breed poplars of 9-year in experimental forest have been analyzed and compared. The damage degree of the moth-eaten trunks of 5-year trees caused by insect pests was researched and analyzed and the adaptability of all breed poplars were investigated.The results showed that the growth difference among different breeds was great,and the Euramerican Poplar No. 108 hasd the largest single tree volume which is 0.238m^3,the Euramerican Poplar No. 107 was second the volume of 0.218m^3. The breeds whose volume growth exceeds the average were Poplar299,I-214,Poplar 46 and 9205. Among the 6 breeds of the largest growth,Euramerican Poplar No. 108,107 and Poplar 299 are damaged the lest, and the breeds of I-214 and Poplar 46 were damaged the less, and the breed of 9205 was damaged the most severe. Euramerican Poplar No. 108 and No. 107 have good adaptability to earth. All the breeds are not damaged by freezing. According to the experiments above, the best of 2 breeds which adapt very well in Dalian were generally chosen to be Euramerican Poplar No. 108 and No. 107, and they could be the important recommended breed. The three breeds which adapt well were Poplar 299,I-214 and Poplar 46, and they could be the common recommended breed.