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在毛主席关于“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成”的教导指引下,各地群众性的选优活动正在蓬勃发展,已取得了丰硕成果。大兴安岭原始林区,有两次森林经理调查资料,多为成过熟林,立木年龄参差不齐,人工林不多,边远林区交通还不方便。根据这种特点,我们通过调查认为:用森林生长过程表的数据乘以一定系数,作为优树固定最低标准,在目前具有一定积极作用。具体做法是: 选优年龄从40龄(年)开始,这时天然林木已正常结实,林木特征已充分展开;同时,因为林区成过熟林分占多数,为便于扩大选优对象,最大选优年龄可延迟为140龄(年)。
Guided by Chairman Mao’s guideline on “excellent varieties, that is, we can obtain more crops without increasing labor force and fertilizers,” mass election campaigns around the country are booming and have achieved fruitful results. Daxinganling original forest area, there are two forest managers survey data, mostly into over-mature forest, standing age uneven, not many plantations, remote forest traffic is not convenient. According to this feature, we have found through surveys that the multiplication of forest growth process data by a certain factor, which is the minimum standard for optimal tree fixation, has a certain positive effect to date. The specific practices are as follows: The optimal age is from the age of 40 (year), when the natural forest has been normal and strong, and the characteristics of the forest have been fully developed. At the same time, because the forest is over-mature, The optimal age can be delayed to 140 years (years).