浙江天童国家森林公园中不同生境石栎树种落果的分析

石栎是浙江天童国家森林公园常绿阔叶林广泛分布的重要伴生树种。以花序特征、座果情况、座果率和生殖投资等指标分析研究不同生境中石栎种群的生殖特征，以果实长度、宽度和重量作为果实大小的指标，宽/长作为果实形状的指标，对不同生境中石栎种群的果实形态进行统计和比较，结果表明：米槠为主的生境石栎种群单个花序的产花量明显高于栲树林生境；两种生境中石栎单花序的平均座果率差异很小，均在51%左右，但成果率则存在着较大的差异；成果重占整个果序重的80%以上，也就是说石栎平均单个果序用于生殖包装的投资占20%左右；石栎果实的长、宽、宽/长3个指示果实形态的性状在不同生境石栎种群之间的差异很小，是一类相对稳定的性状。果实的长度平均在1.8cm左右，果实的宽度平均为1.2cm左右，而果实的宽/长平均为0.7左右，因而是一种长椭球的形状；果实重量的差异比较明显，栲树林中石栎种群的果实的平均重量明显大于米槠林中。说明不同生境类型对石栎的成果率和果实重量有明显影响。进而也是影响石栎种群更新的重要因素。

Analysis on Fruit Character and Sexual Reproduction of Lithocarpus glaber Population in Different Habitats in Tiantong National Forest Park, Zhejiang

Lithocarpus glaber are widely distributed in subtropical evergreen broad-leaf forest of East China.We use the number of the flowers,fructification,fruit ratio,investment in sexual production as index to analyse sexual reproduction of the Lithocarpus glaber population in different habitats.Based on the measurement of the fruit length,width,gravity and width/length,we made a statistics on fruit character of the Lithocarpus glaber population in different habitats.The results are as follows:1)The flower production Lithocarpus glaber in the habitat where Castanopsis carlesii is dominant are evidently higher than that of Lithocarpus glaber in the habitat where Castanopsis fargesis and Schima superba is dominant.2)The difference between two habitats of Lithocarpus glaber population about average fruit ratio is not obvious,but it is quite different about production of ripen fruit.3)The gravity of ripen fruit accounts for 80% of the whole branch.4)There are a little differences in fruit length,width,and width/length of Lithocarpus glaber population in different habitats.The average length of fruit is about 1.8cm,width is approximately 1.2cm.The average width/length is about 0.7,indicating a long and oval sphere.5)The difference of the fruit gravity is significant,the latter is heavier than the former.Based on this study,it is concluded that different types of environment strongly influence its regeneration.