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银白杨×新疆杨杂交组合具有显著的杂种优势,同时也表现出亲本的一些缺点。因此,必须对杂种主要经济性状进行留优去劣的系统选择。1974年以来,我们将获得的银×新杂种苗经苗期对比试验,对杂种无性系进行了选择,初步获得一批优良无性系杂种,可供进一步扩大试验及生产应用。现介绍于下。一、试验区自然概况试验区位于银川西北的芦花台。海拔1100米。年均温8.5℃,月均最高温度23.5℃(7月),月均最低温度-9.2℃(1月),绝对最高温度39.3℃,绝对最低温度-30.6℃,无霜期177天,年降雨量205.4毫米,年蒸发量1454.2毫米,平均相对湿度59％,年均大
Poplar × Xinjiang hybrids have significant heterosis, but also show some shortcomings of the parents. Therefore, the main economic traits of hybrids must be left to poor system selection. Since 1974, we have obtained silver × new hybrid seedlings by seedling comparison test, the hybrid clones have been selected, the initial access to a number of excellent clone clones for further expansion of the test and production applications. Now introduced in the next. First, the pilot area of natural overview Experimental area is located in Yinchuan northwest of Luhuatai. 1100 meters above sea level. The annual average temperature of 8.5 ℃, the monthly average maximum temperature of 23.5 ℃ (July), the average monthly minimum temperature of -9.2 ℃ (January), the absolute maximum temperature of 39.3 ℃, the absolute minimum temperature of -30.6 ℃, frost-free period of 177 days, annual rainfall of 205.4 Mm, the annual evaporation 1454.2 mm, the average relative humidity of 59%, average annual