生物柴油植物麻疯树群体构型对资源性环境因素的反应

Responses of Community Architecture of Jatropha cascus,a Biodiesel Plant,to Resource Environments

本文研究了生物柴油植物麻疯树的群体构型与环境的关系,探讨了分支率、分支角度、分支密度和枝长对资源性因素的反应。把乔木林遮盖、土壤厚度和微地形分别作为光照、养分和水分梯度的样地选择标准。结果表明,在林外强光、土层厚度较大与水分含量较高时分支率明显较高,枝长明显较大,分支角度无变化。分支密度是群体构型的一个重要特征,与分支率和枝条密度呈现直线相关。在水分含量较高的样地分支密度显著较高。表明,麻疯树群体构型对资源性环境因素存在明显的反应,具有资源环境依赖性。在生产上,需要从群体构型特征优化上考虑高产和经营问题。

In this paper, researches were conducted on the relationship between the community architecture of a biodiesel plant, Jatropha cascus, and the enviroment and a discussion was made of the repsonse of branching ratio, branch angle, branch length and branching density to the resource environment. In the selection of relative consistent plot, arbor forest shading the light, soil deepth and micro-topography respectively were kept as the standard of plot selection for light, nutrition element and moisture difference. Results indicated that the branching ratio was bigger, branch length was longer and branching angle was not different in the condition of dense light with on arbor canopy, deeper soil depth and higher moisture content. Branching density was an important characteristic of community architecture and was a linar relationship with branching ratio and branch density. Results demonstrated that higher moisture content had a significantly bigger branching density in Madianhe plot with a moisture difference. Observation also indicated that the branching density was higher in the plots with on arbor canopy and deeper soil layer,which implied that the community architeture of J. cascus displayed an obvious repsonse to the resource environment and had a dependency of resource environment. Practically, the problem of higher production and management required to be considered to optimize community architecture characteristics.