一、概况 为了有计划地开发林区、合理经营管理,经过森林经理调查,1954年第一次对吉林省长白山林区48个施业区编制并审查通过了森林施业案。到现在为止,已在1亿公顷的林区内(占现有森林面积的83％)完成这项工作,有的已完成了第二期的施业案的编制工作。全国性的森林资源调查(一类调查)已做了三次。第一次在1963—1965年;第二次在1973—1976年;第三次从1977年开始到1981年完成。尽管这几次森林调查,在 I. Overview In order to develop the forest area in a planned way and manage it rationally, after investigation by forest managers, the first case of 48 forest management areas in Changbai Mountain of Jilin Province was compiled and examined and approved through 1954. So far, this work has been completed in 100 million hectares of forest area (accounting for 83% of the existing forest area), and some of them have completed the preparation of the second phase of the operation. The national forest resource survey (a type of survey) has been done three times. The first in 1963-1965; the second in 1973-1976; the third in 1977 and 1981. Despite these few forest surveys, at