林分蓄积量计算

1、林分蓄积量计算、方法、步骤（一）平均标准木法1 .根据标准地每木调查资料，分别树种统计各径阶株数及标准地总株数（见用表2-1）。2 .计算标准地总断面积，平均断面积及平均胸径。3 .根据树高曲线（附表 2-1）,计算林分平均高。4 .以林分平均胸径和平均高作为选择标准木的标准，在标准地内选伐标准木，并区分求积。5 .标准地蓄积量计算m myg标准地m标准地=工vj -mg左gjj 1式中：vj、gj第j株标准木的材积、断面积m标准木株数g标准地 一标准地总断面积6.换算成每顷蓄积量:标准地标准地面积注：本次作业标准木实测资料见附表2-2,在该表中选择符合要求的标准木。（二）径级标准木法为了提高

2、蓄积计算精度，有时需要把标准地内的林木分成若干径级，在每个径级内选取平均标准木， 按照平均标准木法计算各径级的蓄积量，各径级蓄积量合计得标准地蓄积量。进而换算成林分每公顷蓄积 量。等株径级标准木法（见用表2-2）。1 .划分径级：将标准地内全部林木分成几个（一般 3-5个）径级，使每个径级内的株数相等。2 .计算各径级的平均胸径，在树高曲线上确定平均高。3 .分别径级以平均胸径和平均高选择标准木，伐倒区分求积。（本作业用附表2-2资料）。4 .计算标准地蓄积量km标准地 二 i 1式中：vij、gij第i径级第j株标准木的材积、断面积 mi第i径级标准木株数gi第i径级总断面积 k一径级数5.

3、换算成每顷蓄积量:m标准地m 二-、.标准地面积（三）材积表法2-3）,得各径阶的单株材积，乘以各1 . 一元材积表法根据外业每木检尺得各径阶株数，再查适合的一元材积表（附表 径阶株数得各径阶蓄积，合计得标准地蓄积量，再换算成林分每公顷蓄积量。2 .二兀材积表法由树高曲线计算出各径阶平均高，根据径阶平均高及径阶中值查该树种的二元材积表（附表2-4）,得 各径阶单株材积，其它过程同一元材积表法。以上计算结果填入用表（2-3）,。（四）标准表法1 .确定林分平均高，计算每公顷断面积（ g现）2 .根据林分平均高查该树种的标准表（附表2-5）,得标准林分的每公顷断面积 （g标）和蓄积量（m标）。3

4、.计算现实林分的每公顷蓄积量，计算结果填入用表（2-4）。.g 现.m现=一mm标g标（五）平均实验形数法，计算结果填入用表（2-4）。m =g h d 3 f3式中：g 一每公顷断面积hd一林分平均高平均实验形数（查表）二、作业填写用表2-1至用表2-4。附表2-1测高记录表树高曲线h = 12.20d0.19附表2-2标准木实测各因子统计表d(cm)h(m)v(m3)12.220.90.081016.521.10.200217.519.20.251817.621.10.230420.521.40.308620.520.40.310721.222.20.313323.423.10.46042

5、3.522.40.431124.423.00.432424.622.50.481625.321.70.437225.522.30.522625.622.00.534526.322.80.521826.524.10.585027.024.70.680028.523.80.749432.024.10.908332.523.80.811834.524.30.954240.525.61.330043.026.01.569847.826.81.9400附表2-4落叶松一元材积表db2178794辽宁东部林区落叶松（围径一元cm . md0.00. 10. z一i0.3q.4q5o.f0. 70. 80.

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