论文部分内容阅读
1.欧美杨 108是中国林科院的“九五”科技攻关成果,是黑杨派欧美杨新品种。该树种生长快,扦插当年苗高4～5米,胸径年均生长量4厘米。5年成才,一个轮伐期(6～7 年)亩产木材30～40立方米。对土壤要求不严,在 PH 值7～9的沙壤土上和年降雨量300毫米的地区生长良好。其干型、材质、成活率等与欧美杨107号相当,但更为耐旱、抗寒、抗虫,能在-35℃低温地区安全越冬,对光肩星天牛具有明显抗性,是国家林业局重点的推广品种。2.中林2001杨树该杨属黑杨派间杂交种,树干通直圆满,顶端优势明显,除具有美洲黑杨生长量大、成材早、繁殖容易、造林成活率高的特征外,它的主要
1. Europe and the United States Yang 108 is China Academy of Forestry ’ “95 ” scientific and technological achievements, Populus is Europe and the United States to send Yang new varieties. The rapid growth of the species, cuttings that year, 4 to 5 meters in height, average annual growth of 4 cm in diameter. 5 years to become talent, a rotation (6 to 7 years) per mu of timber 30 to 40 cubic meters. Strict requirements on the soil, in the PH value of 7 to 9 sandy loam and annual rainfall of 300 mm in the area of good growth. Its dry type, material quality and survival rate are comparable with that of Europe and the United States Yang 107. However, it is more drought tolerant, cold tolerant and insect resistant and can win over-35 ℃ in low temperature areas. The promotion of varieties. 2. Zhonglin 2001 poplar The Populus is a black-poplar interspecific hybrid, the trunk straight round, obvious advantages at the top, with the growth of Populus tomentosa big, early, easy propagation, afforestation survival rate is high, it Mian