为探讨石竹笋长成幼竹的生长规律及后期的生长特征，对福建省上杭县天然石竹林竹笋的日高生长量、成竹高度、产笋量、地径、高度和节间长度等进行连续33 d 的观测。结果表明：竹笋长成幼竹的高生长模式方程为：H ＝100/（1＋17.53556 e-0.18864 t ）。最大生长速度的生长期为15.18 d。产笋前期笋地径大，高度大，单株竹重，但笋期短，数量少；产笋中期笋地径中等，冠层低，但笋期长，数量多。节间长与节数关系类似抛物线，拟合方程为：y＝-0.0789 x2＋2.9004 x-3.0825。分析节间生长和笋期规律，合理确定竹笋留养时期：培育速生丰产林以中期留养为好，而培育大径竹则以前期留养为好。%In order to discover the growth rule of the shoots to juvenile and growth characteristic of Phyllostachys nuda,daily height increment,adult height,shoot yield,ground diameter,height and knob interval of natural P.nuda shoots were determined successively for 33 days in Shanghang Fujian province.The results indicate the growth model equation from the shoots to juvenile is H=100/(1+17.53556 e-0.18864 t ).The most rapid growing period is 15.18th day.During the earlier stage of shoot production ,the shoot ground diameter is big,height is high,and individual bamboo is heavy ,but the period of shoot production is short ,and shoot quantity is less;During the middle stage of shoot production ,the shoot ground diameter is moderate ,the crown storey is low ,but the period of shoot pro-duction is long ,and shoot quantity is more;the relationship between knob interval and knob number is similar to parabola ,and the fit-ting equation is y=-0.0789 x2 +2.9004 x-3.0825.The rational maintaining cultivation for shoots is confirmed by analyzing knob in-terval growth and shoot production period: the middle stage maintaining cultivation is good for establishing the fast growth and high yield plantation,and the earlier stage maintaining cultivation is good to establish the plantation for the purpose of big diameter .
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