为了进一步查清查准幼林资源和面积,我队在党和上级领导下,在马尔康林业局和阿坝州林业局的协助配合下,1972年于马尔康毛茂楚沟进行了人工更新调查方法的调查研究工作。这次调查研究工作除采用典型抽样调查方法外,主要应用分层抽样调查的原理进行了五种方法的抽样调查,最后对抽样调查总体进行实测对照。分层抽样应用于人工更新调查,还是一项新的工作。为了 In order to further check out the resources and area of ​​the quasi-approached young forest, under the leadership of the party and the superior, with the assistance of the Malcolm Forestry Bureau and Aba Prefecture Forestry Bureau, our team investigated and researched the manual update survey method in Ma’ermang Mao-Mao Chu Gou in 1972. In addition to the typical sample survey method, this survey mainly uses the principle of stratified sample survey to carry out the sample survey of five methods. Finally, the sample survey is generally measured and controlled. Stratified sampling should be applied to manual update surveys, or a new job. in order to