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在生产实践中,大多数的杨树品种或杂交种,常采用插条法进行繁殖。但是杂交杨仅在条件较好的,首先是土壤非常湿润的地方才能旺盛的生根。干旱的春天,很多地方都缺水,因而与肥沃湿润处相比,它们的生根率、成活稳定性及以后的生长情况均差得很远。我们对5年生的勃—155号杂交杨(№155—6)林进行了研究。它们是在干旱的春天,分别用插条和栽植一年生带根苗的两种方法营造的。结果发现:前者仅在插穗下端,即20厘米深处形成根系,而30厘米深处很少;后者根系却相当发达(表1)。这可
In production practice, most poplar varieties or hybrids often breed by the cuttings method. However, the hybrid poplar can only take root vigorously where the conditions are good, and above all the soil is very moist. In dry spring, water is scarce in many places, so their rooting rate, survival stability and subsequent growth are far worse than those of fertile wetlands. We studied the 5-year-old Bo-155 hybrid poplar (№ 155-6) forest. They were created in two different ways during the dry spring, using cuttings and planting annual rooted shoots. The results showed that the former only formed roots at the lower end of the cuttings, that is, at a depth of 20 cm, but few at a depth of 30 cm. The latter root system was quite developed (Table 1). This can be