杨树人工林生物量估计方法与应用

Study on the Biomass Expansion Factor of Poplar Plantation

为了以杨树人工林的森林资源调查资料估算其生物量，利用SPSS12．0软件，根据林术相对生长法则对河南省武陟县23株I-72杨样木生物量实测值进行模型拟合，并结合样地资料，拟合了生物量扩展因子（BEF）、树根生物量与地上部分生物量的比值（RSR）及与林分调查因子的回归方程，最后利用林分蓄积及木材密度等算出杨树林的生物量。结果表明，杨树的生物量扩展因子BEF值为1．3左右、RSR值为0．14～0．6，并随着林分平均高、胸高断面积、林龄、林分蓄积的增大而减小。经检验，利用生物量扩展因子法估算杨树人工林的生物量具有很好的精度，说明可以利用森林资源调查资料估算杨树人工林的生物量。

In order to estimate poplar biomass by using forest inventory of poplar planting trees,while applying software SPSS12.0, according to collected materials of 23 sample trees of I-72 Poplar biomass in wuzhi county,the allometric equation has been designed to estimate poplar biomass. Biomass Expansion Factor （BEF） function and the ratio of the weight of the root to the weight of the shoot （RSR） function of stand description factors were established by forest inventory and allometric equation and then the total stand biomass was computed according to the growing stock and basic wood density. The results of function curve estimation show that BEF and RSR have very good relevance to stand average height, basal area, stand age and stand volume,and the value of BEF is about t. 3 and the value of RSR range from 0.14 to 0.6,and reduces with the value of forest inventory increases. The study could offer a quality basis for using forest inventory of poplar planting trees to estimate pop lar biomass.