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培育优质速生的苗木,对营造速生丰产林具有重要意义。香杨、大青杨是适于本地的高产速生树种,但由于本地处于高寒山区,无霜期只有110—125天,春季化冻晚,导致本地每年香杨开花结实成熟期都在6月15日以后。因此,我们苗圃连续四年播种培育香杨,当年高仅在12—15厘米之间,地径在0.2—0.3厘米之间,而且木质化不良。杨树造林的苗木,不得不从外地调运。本地造林时间大都在5月上旬,而从外地调进的杨树苗,早已萌动,加上长
Nurturing high-quality fast-growing seedlings, to create fast-growing forest is of great significance. Perilla frutescens and Populus euphratica are suitable for the local high-yielding quick-growing tree species. However, since the locality is in the alpine mountainous area, the frost-free period is only 110-125 days and the spring thaw is late. As a result, the local annual flowering and maturity of the fragrant poplar occur after June 15. Therefore, we cultivate nursery for four years in a row Yang Hong, high then only 12-15 cm, diameter 0.2-0.3 cm, and poor lignification. Poplar afforestation seedlings, had transferred from the field. Most local afforestation time in early May, and transferred from the field of poplar seedlings, already germinate, with long