据我们多年的观察,辽宁西部的人工油松林有“头三年不见树,后三年不见人”的生长发育特点。造林后头三年由于扎根缓苗等原因,生长是比较慢的,后三年已形成较强大的根系,生长开始加快。根据这个特点,在进行幼林抚育时,应采取与其相应的抚育措施。一、植苗造林的幼林抚育成活缓苗阶段:造林后的第一年,由于移栽时油松幼苗的根系遭受一定程度的损伤,根系的吸收能力显著减弱。这一年抚育的任务,主要是恢复根系的生理机能,促进幼苗的成活。抚育措施应围绕减少苗木地上部分的蒸腾量,保持吸水与蒸腾作用的平衡来进行。对新栽的幼苗来说,最好有一个光照不太强,土壤 According to our many years of observation, the artificial pine forests in western Liaoning have the characteristics of growth and development of “the first three years do not see the tree, the last three years do not see people”. The first three years after afforestation due to rooted Huanmiao and other reasons, the growth is relatively slow, after three years have formed a stronger root system, growth began to accelerate. According to this feature, in the young forest tending, should take its corresponding tending measures. First, seedling afforestation young forest tending to promote Huanmiao stage: afforestation in the first year, due to transplanting Pinus tabulaeformis seedlings suffered a certain degree of root damage, significantly reduced the absorption capacity of the root system. The task of tending this year is mainly to restore the physiological functions of the root system and promote the survival of seedlings. Tending should focus on reducing the transpiration of shoots above ground and maintaining the balance between water absorption and transpiration. For the newly planted seedlings, it is best to have a light is not too strong, soil