桫椤群落的种内种间竞争研究

根据调查资料,采用Hegyi提出的单木竞争指数模型对贵州习水自然保护区的桫椤种内种间竞争强度进行定量分析。结果表明:桫椤种内种间竞争强度随林木径级的增大而减小,种内竞争较种间竞争强;桫椤与竞争木的种间竞争强度依次为:在群体水平上是桫椤>杉木>灯台树>大头茶>贵州琼楠>粗糠柴>黄栌>香桦>小果冬青>油桐;在个体水平上是黄栌>赤杨叶>大头茶>马尾松>灯台树>杨梅>桫椤>盐肤木>棕榈>柃木>毛桐。生态习性相近的种为灯台树、柃木、贵州琼楠。对象木胸径与竞争强度间成显著负相关关系。

INTRASPECIFIC AND INTERSPECIFIC COMPETITION IN ALSOPHILA SPINULOSA COMMUNITY

The competition index model proposed by Hegyi was used to study the intra-specific and inter-specific competition in an Alsophila spinulosa community based on the data in a survey conducted in Xishui Natural Preserve of China's Guizhou province. The intensity of intra- and inter-specific competition of Alsophila spinulosa was found to decrease with the increase in DBH (diameter at breast height) of the plant. The inter-specific competition intensity at the community level was in the order of Alsophila spinulosa > Cunninghamia lanceolata > Cornus controversa > Polyspora axillaries > Beilschmiedia kweichowensis > Myrica rubra > Cotinus coggygria >Betula insignis > Ilex micrococca > Aleurites fordii, and that at the individual level was in the order of Cotinus coggygria > Alniphyllum forthunei > Polyspora axillaries > Pinus massoniana > Cornus controversa > Myrica rubra > Alsophila spinulosa > Rhus chinensis > Trachycarous fortunei > Eurya japonica > Mallotus barbatus. The DBH of the objective trees was negatively correlated with competition intensity. Ecological properties of Cornus controversa, Eurya japonica and Beilschmiedia kweichowensis are close to those of Alsophila spinulosa.