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作 者 ：赵秋玲1，张宋智1，王军辉2*，贠慧玲1，冯小芹1

期 刊 ：西北植物学报 2012年 4期 页码：802~806

关键词：梓树；生物量；竞争；通径分析；

Keywords:Catalpa ovata, biomass, competition, path analysis,

摘 要 ：采用生物量计算的竞争指数和通径分析的方法，研究了3种密度的梓树苗木地下竞争和地上竞争的关系及对总竞争的影响。结果显示，梓树苗木地下生物量、地上生物量和总生物量与密度密切相关，随着密度的增加，其根、茎、叶的生物量减少，根冠比均小于1。在同一密度条件下，地上竞争指数明显大于地下竞争指数，地上竞争对总竞争的直接作用范围(0.449 3～0.973 1)明显大于地下竞争对总竞争的直接作用(0.275 6～0.773 2)。研究表明，梓树幼苗地上茎、叶的竞争在梓树苗木总的竞争中占有重要地位。

Abstract:An experiment was conducted by the methods of path analysis and competition index based on biomass,to study the impact of different planting density of Catalpa ovata seedling above-ground and below-ground competition to general competition.The result showed that there were close relationship among above-ground biomass,below-ground biomass and total biomass,with the density increased the biomass of root,shoot and leaves decreased and the ratio value of above-ground biomass with below-ground biomass was lower than 1.Above-ground competition was obviously larger than below-ground competition under the same density.The direct effect of above-ground competition on general-competition was from 0.449 3 to 0.973 1,which was obviously larger than below-ground competition on general-competition (0.275 6~0.773 2).Shoot and leaves of C.ovata seedling competition play an important role in general-competition.

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