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正确的调查人工幼林的生长情况,可以看出在不同的立地条件下,那些造林方式和方法好,以便今后在生产上采用。目前,人工造林已占有很大的面积,不可能对所存的幼苗进行全面的调查。因此,我们不得不采用选择性的调查方法。根据数理统计的原理,设置不同形状和大小的调查单位,这些调查单位的总和应该正确地反映全部被调查地区幼苗的数量和质量。
The correct investigation of the growth of artificial young forest can be seen in different site conditions, those afforestation methods and methods for future production in the adoption. At present, afforestation has occupied a large area, it is impossible to carry out a comprehensive investigation of the seedlings. Therefore, we have to adopt selective methods of investigation. According to the principles of mathematical statistics, the establishment of different shapes and sizes of the survey units, the sum of these survey units should correctly reflect the number and quality of seedlings in all surveyed areas.