不同密度闽楠苗木地上部分与地下部分竞争的定量研究  

Quantitative study on competition between the underground and aboveground of seedlings of Phoebe bournei in different planting densities

作　　者：刘宝[1] 陈存及[1] 林思祖[1] 陈东阳 

机构地区：[1]福建农林大学林学院,福建福州350002 [2]厦门兴海湾监理咨询有限公司,福建厦门361000

出　　处：《福建林学院学报》2013年第2期119-123,共5页Journal of Fujian College of Forestry

基　　金：福建省林业厅种苗攻关科学基金资助项目(闽林综[2003]127)

摘　　要：利用通径分析方法,分析了3种密度下的闽楠(Phoebe bournei)苗木地下及地上部分竞争关系及对总竞争的影响。结果表明,随着闽楠苗木间距的增加,相关的竞争指数减小。同一密度下,地上竞争指数大于地下竞争指数。从各竞争指数的相关系数分析看出,各竞争指数之间的相关性较为显著。但是总竞争受地下及地上竞争的影响是不一样的,通过通径分析手段能区分地上及地下竞争的相对大小。总竞争受地上竞争的直接影响范围在0.338 5-0.703 1之间,明显大于地下竞争的直接影响(0.201 3-0.376 9)。随着间距的增大,苗木的生长空间变大,地上部分的竞争变大,而地下部分的竞争减小。但是,地上部分的竞争对闽楠苗木的总竞争有着重要的影响。Competition between the underground and aboveground of seedlings of Phoebe bournei was investigated by the method of path analysis in 3 different planting densities.The results showed that the related competition indices decreased with wider spacing.The aboveground competition index was greater than the underground in the same planting density.The correlation was significant among the underground,aboveground,and general competition.Coefficients of path analysis,at 3 spacing levels,showed that the direct influence intensity of aboveground competition on general competition was from 0.338 5 to 0.703 1,significantly greater than 0.201 3 to 0.376 9 of the underground competition.With wider spacing,the growing space of seedlings was broader and the aboveground competition was intense and that of the underground competition was decreasing,however,the aboveground competition had an important influence on the general competition.

关 键 词：闽楠 通径分析 地上竞争 地下竞争 

分 类 号：S792.24[农业科学—林木遗传育种]