浙江天童常绿阔叶林演替系列栲树和木荷成为优势种的原因

通过对浙江天童国家森林公署常绿阔叶林演替系列的群落生态学调查，确认栲树（Costanopsis fargesii Frunch)和木荷（Schima superba Gandn,et Champ.)属于常绿阔叶林演替系列群落的优势种，为了揭示栲树和木荷在群落演替过程中成为优势种的原因，研究了栲树和木荷的生物生态学特性的一些生物生态学特性，结果表明，在常绿阔叶林演替的后期，栲树结实能力强，种子萌发率高，产生幼苗较多且其萌生能力较强，更新后备充路，而木荷虽然种子在群落中保存时间短崦发能力强，种子萌发率高，产生幼苗较多且萁其蓝生能力较强，更新后备充足，而木荷虽然种子在群落中保存时间短而萌发率较低，但萌生能力也较强，与其它常绿痴叶树种相比，栲树和木荷的分枝能力较强，物质作用面较大，光合速率较高等特性为它们成为常绿阔叶林演替系列群获优势种奠定了生物学和生理生态学方面的基础。

The Causes of Castanopsis Fargesii and Schima Supe rba Being Dominant Species of Series of Evergreen Broad-Leaved Forest in Zhejiang Tiantong

Through the synecological investigating to the series of evergreen broad-leaved forest of Tiantong National Forest Park in Zhejiang Province, it has been confirmed that C.fargesii and S. superba are the dominant species in the series of evergreen broad-leaved forest. For revealing the causes of C.fargesii and S.superba being the dominant species of evergreen broad-leaved forest, the bio-ecological characteristics and some physi-ecological characteristics are studied. The results show that in the late successional stage of evergreen broad-leaved forest, C.fargesii has sufficient regenerating seedlings and young trees because of its strong ability of fruiting, high seed germinating rate and strong sprouting ability. And even though the seed germinating rate of S.superba is very lower, its sprouting ability is also very stronger. Compared with other evergreen broad-leaved trees(such as Lithocarpus glaber Nakai and C.sclerophylla Schott), C. fargesii and S.superba have stronger branching ability, bigger crown and higher rate of photosynthesis,so their mature trees grow quickly,and the phenomenon of decrepitude is not obvious. These characteristics make C.fargesii and S.superba the dominant species of evergreen broad-leaved forest.