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寒冷半干旱地区引种欧美杨 ,经苗期、品种评比与区域化栽培试验等长达 15a的测定与选择 ,从中选出DN113杨新品种。该品种生长量、抗病虫、耐干旱及材性等特性较为突出。其中 9～ 10a生材积生长量超过小黑杨1倍多。致死土壤含水率为 5 .0 0 % ,含盐量 >0 .4% ,pH值 >9.77为致死或半致死指标。该品种能在最低气温- 3 7.2℃ ,年均温度 3 .2℃ ,年降水 40 0mm左右 ,无霜期 13 0d以上的自然条件下正常生长。首次将欧美杨引种到北纬 47°2 7′的地区并获得成功。为高寒地区选育欧美杨树种 ,提供成功的典范
Cold and semi-arid areas introduced Europe and the United States poplar, the seedling stage, variety appraisal and regional cultivation tests and other up to 15a determination and selection, selected from the new varieties of DN113 Yang. The variety growth, pest resistance, drought resistance and material properties are more prominent. Among them, the volume growth of 9-10 years biomass exceeded that of Populus by more than one time. Mortality rate of soil water was 5.0%, salinity> 0.4%, pH> 9.77 as a lethal or lethal index. The variety can grow under the natural conditions of the lowest temperature of -3.22 ℃, the average annual temperature of 3.2 ℃, the annual precipitation of about 40 0mm and the frost-free period of 13 0d or more. It was the first time that the European and American poplars were introduced into the 47 ° 27’N area and succeeded. Breeding European and American poplar species in the alpine region provides a successful example