样本量对云南松苗木生物量特征的影响

Effects of Sample Sizes on Biomass Characteristics of Pinus yunnanensis Seedlings

为探讨不同样本量对云南松生物量积累、分配的影响,以20个云南松家系(共615株)幼苗为试验材料,随机抽取部分数据,分析样本量对云南松幼苗鲜重、干重积累和分配的影响,确定各性状结果所需的最低样本量。结果表明,不同样本量中各组分生物量的积累由大到小均表现为:叶生物量、茎生物量、根生物量;生物量积累和分配在不同家系样本量和单株样本量间存在不同显著性,生物量计算值随样本量的增加而逐渐稳定,在测定的家系数量小于12个,或者测量的单株数小于360株时,各梯度生物量值有波动,标准误和变异系数较大,随家系样本量或单株样本数量的增加,准确度逐渐增加。因此,对本研究的测定群体而言,要获得较为准确的生物量计算值,测定的云南松家系数量应大于12个,或者测量单株数要大于360株。本研究为云南松生物量的计算提供一定参考,结果及研究方法对类似测定群体的生物量计算所需样本量具有参考意义。

To investigate the effects of the different sample sizes on the biomass accumulation and allocation of Pinus yunnanensis,some data were randomly selected from the seedlings of 20 P.yunnanensis families with a total of 615 plants.The effects of sample sizes on fresh weight and dry weight accumulation and allocation of the seedlings were analyzed.And the minimum sample sizes required for the accurate results for each trait were determined.The biomass accumulation of different organs was in the order of leaf>stem>root biomass in all the sample sizes adopted.Different significances were found in biomass accumulation and allocation among different sizes of family number and plant number samples.The calculated values of biomass gradually stabilized with the increase of sample size.When the number of family lines measured was less than 12,or the number of individual plants measured was less than 360,there were large standard errors and coefficients of variation.The accuracy increased with the increase of family sample size or individual plant sample size.Therefore,to obtain more accurate biomass analyses for the measurement population,the number of P.yunnanensis families measured should be greater than 12,or the number of individual plants measured should be greater than 360.This study provides some references for the biomass analyses of P.yunnanensis,and the results are useful for the determination of sample sizes required for biomass measurement.