大熊猫主食竹八月竹笋期生长发育规律初步研究

Preliminary study on the growth and development regularity during shooting period of Chimonobambusa szechuanensis(Rendle) Keng f.

2008年7～9月,在四川省洪雅县瓦屋山自然保护区及其周边对八月竹(Ghimonobambusaszechuanensis(Rendle)Keng f.)生长发育规律及环境因子与竹笋生长发育的关系进行了初步研究.研究结果显示:区域内八月竹发笋时间历时45 d,在发笋的前期(1～15 d)出笋数量较少,发笋量占总发笋数量的24.39%,中期(16～30 d)发笋数量最多,占总发笋数量的53.62%,后期(31～45 d)发笋量比例为21.99%;发笋的高峰期在8月末9月初;笋(幼)竹高生长遵循逻辑斯谛曲线(H=336.113/(1+e^(4.625-0.224t));笋(幼)竹平均高生长时间为35.45±4.873 d(n=287);母竹数量影响发笋数量,母竹数量适中发笋量最好;发笋量随着乔木郁闭度的增大而显著减小(P<0.05);随着枯立竹数量的增加,发笋量呈下降的趋势.

A preliminary study concerning growth regularity and the relationship between the growtn ana environmental factors of Chinmonobambusa szechuanensis was conducted in Waw.ashan nature reserve in Hongya county of Sichuan province from August to May in 2008. The results showed that： the entire shooting period lasted approximately 45 days, the number of bamboo shoots came out in early-term was small, 21.99% to the total number. Bamboo shoots came out mostly in the medium-term, its proportion was 53.62% ,and the latter-term was 21.99%. The peak time was from the end of August to early September. The growth of bamboo shoots follow the Logistic curve（H=336. 113/（1＋e^4.625-0.224t The average time of high growth for Bamboo shoots was 32.5 days. The amount of shoots was related to adult bamboos. The amount of shoots significantly reduced as the increase of canopy cover（P〈0. 05） ;The amount of shoots showed a downward trend as the increase of died bamboo.