在林业局(场)总体设计中,苗圃是其中营林设计的一个重要组成部分。但目前确定苗圃面积多以通过计算某年育苗面积而获得,似觉不甚合理,现提出如下计算方法供参考。一、确定苗圃面积的依据我们认为确定苗圃面积首先应当根据总体设计规程要求,即按“营林和木材生产的生产能力达到设计规模”来确定。也就是说设计年伐量是确定苗圃面积的主要依据之一。在一般情况下,年伐量越大,更新面积也越大,当然更新、造林所要的苗木也越多,育苗用地面积或者苗圃面积也越大。但是,由于采用不同的主伐方式、更新方式、方法和其它一些原因,经常会造成相等的设计年伐量,在更新时需要不等数量的苗木。同时,由于设计年伐量的面积分配与资源分布特点相联系,而主伐方式又影响更新方式的选择等等。因此,苗圃面积应 In the overall design of the forestry bureau (field), the nursery is an important part of the design of the forest. However, the current nursery area to determine more by calculating the area of ​​a year nursery area obtained, does not seem sensible, are now proposed the following calculation for reference. I. Determine the nursery area basis We believe that the nursery area should be determined first of all according to the requirements of the overall design code, that is, according to “the production capacity of silviculture and timber production to design scale” to determine. In other words, the annual design of cutting is to determine the nursery area is one of the main basis. In general, the larger the annual cut, the larger the area to be renovated. Of course, the more afforestation seedlings are required, the larger the nursery area or nursery area is. However, due to the different methods of harvesting, methods of updating, methods and other reasons, it is common to create equal annual design cuts, which require an unequal number of seedlings when updating. At the same time, the area allocation due to the design annual cut is related to the resource distribution, and the main cutting method also affects the choice of updating methods. Therefore, nursery area should be