= P 式中的G n+p ,G n ,P=均同前 (3)总平均生长量(mean annual increment, MAI)： 为现实生长量被年龄数所除得之商，一般简称之平均生长量，概皆指此而言。其计算 公式如下： M.A.
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草原区种源的植株月平均生长量大于沙漠区种源的生长量。
The plants from the seeds introduced from the grassland region had higher monthly growth rate than those from the seeds introduced from the desert region.
提出了以定期结实年数和定期结实枝平均生长量为标准的优树选择方法。
The great bearing interval was regarded as optimum time, and optimum method for plus tree selection was put forward by the analytical results.
而在光照和水分供应充足的条件下，榉树的苗木高、地径平均生长量是庇荫、水分供应相对少的2.8倍。
The height and basal diameter growth with sufficient light and water supply was 2.8 times of seedlings under shady conditions and with insufficient water.
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