抚育采伐是导致森林优质、速生、丰产,以适应社会主义建设需要的重要措施之一。本文根据我们的实践,就云南松幼林的抚育采伐强度和间隔期提出我们的意见;并从实际出发,探索新的、简易的识别森林疏密度和确定伐留林木数量的方法。(一)要确定伐留林木数量,一般首先要测定森林疏密度。山区地形复杂,立地条件变化很大,这个方法很难应用。另一个方法是用郁闭度代替疏密度。然而树冠由于 Deforestation is one of the important measures leading to the high quality, fast growing and high yielding of forests in order to meet the needs of socialist construction. Based on our practice, this paper puts forward our opinions on tending strength and spacing of young Pinus yunnanensis nurturing forests. Based on the actual situation, this paper explores new and simple methods to identify the density of forest densities and determine the number of forest left. (A) To determine the number of forest logging, generally first determine the degree of forest density. Mountainous terrain is complex, site conditions vary widely, this method is difficult to apply. Another method is to use density of density instead of density. However, the crown due