六个杨树无性系苗木生长、生物量和光合作用的研究

Comparison of Growth,Biomass and Photosynthesis among Six Poplar Clones in Cold Semi-arid Area of Northeast China

六个杨树无性系苗木（２年生根１年生于）叶面积、苗高和地径的季生长用Ｒｉｃｈａｒｄｓ方程模拟，根据模拟参数分别计算最大绝对生长速率，平均绝对生长速率，生长期和拐点。结果为：六个无性系之间在生长速率、拐点和生长期方面均有明显的差异；最好的欧美杨６４号生长季末的总生物量是赤峰杨３４号的六倍多；六个无性系的总生物量与它们的总叶面积、平均单个叶片的面积、叶面积的平均生长速率和每株树的日净光合总量等呈正相关，而与单位叶面积的日净光合总量呈负相关；总生物量生产依赖于叶面积、苗高、直径的生长速率及其生长期。

The seasonal growth of leaf area,height and diameter in six poplar clones(one-year old shoot/two-year old root)in 1993 was simulated with Richard function. Theabsolute growth rate,mean absolute growth rate,duration of growth and the point of inflex-ion were calculated using the parameters in the fitted functions respectively.There were sig-nificant differences among the six clones in growth rate,point of inflexion and duration ofgrowth.A more than sixfold difference was found between the total biomass production ofthe best introduced clone POpulus ×euramericana cl.‘N3106’and that of the worst nativeclone Populus simonii ×P.pyramidalis cv.‘Chifengensis 34’.There is a linear correlationsbetween the total biomass productions of these six clones with their total leaf area,individualleaf area,mean AGR of leaf area,and daily total net photosynthesis per tree,but a negativecorrelation with daily total net photosynthesis per unit leaf area.The high biomass produc-tion depends on the growth rate of leaf area,height and diameter,and the duration ofgrowth.