论文部分内容阅读
油松是我国自然分布较广的树种之一,仅我省的油松天然林就约有70万亩,油松造林在我省占有重要地位。我所一九七八年参加了我国北方油松种源试验协作组,收集北方九省(区)20个产地的油松种子,于一九七九年春育苗,一九八一年出圃造林,定植在兰州市东郊大青山山顶,海拔1780m,现已是六年生的幼树,共计896株。各种源定植后生长良好。六年生幼树高生长量平均为0.84米,地径为4.04厘米,最高的单株高已达1.44米,一九八四年
Pinus tabulaeformis is one of the widely distributed tree species in our country. Only about 70 million mu of Pinus tabulaeformis forest is the only one in our province. Pinus tabulaeformis afforestation occupies an important position in our province. In 1978, we participated in the Cooperative Group of Pinus tabulaeformis in North China. We collected the seeds of Pinus tabulaeformis in 20 producing areas in 9 provinces (districts) in the north. In the spring of 1979, we nurtured seedlings and afforestation was started in 1981. Colonization in the eastern suburbs of Lanzhou Daqing Peak, elevation 1780m, is now a six-year-old saplings, a total of 896 strains. Various sources grow well after planting. The annual growth of six-year-old trees averaged 0.84 meters and a diameter of 4.04 cm. The highest single plant height reached 1.44 meters. In 1984