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二、用顺序进级法推算一定时期的材积生长量:预计材积生长量应根据各径级的计算连年生长量来推算。一定时期(一般为10年)的预期直径生长量的计算方法是,用直径连年生长量乘以该阶段的年数。如果具有可靠的有关直径生长量动向的资料,所得数字还可以进一步订正。在确定林木进级的时候可
Second, with the order of promotion method Calculate the volume growth of a certain period of growth: the expected volume growth should be calculated according to the diameter of successive years of growth to projections. The expected diameter growth over a given period of time (typically 10 years) is calculated by multiplying the annual growth of diameter by the number of years of that period. The figures obtained can be further revised with reliable data on the trend of diameter growth. When determining the progress of the forest can be