坡位对毛竹林下黄花远志生物量积累与分配及其异速生长关系的影响

【目的】林药复合经营是提高毛竹林经济效益的重要途径。分析毛竹林下黄花远志(Polygala fallax)生长、生物量积累与分配的坡位效应,旨在为毛竹黄花远志复合经营提供理论指导。【方法】以毛竹林下2年生扦插苗造林后1年的黄花远志为调查对象,分析了不同坡位黄花远志生长状况、生物量积累与分配规律及其异速生长关系。 【结果】毛竹林下黄花远志造林成活率均超过92%,且坡位间无显著差异。随坡位下降,黄花远志地径、苗高呈现出波动性上升趋势,根、茎、叶各器官及总生物量总体上均呈显著升高的变化趋势;叶生物量分配比例降低,而茎、根生物量分配比例则总体升高,中坡位黄花远志根生物量及其分配比例、根与总生物量异速生长指数均最高。【结论】黄花远志能适应毛竹林下环境,并生长良好,可以实施毛竹-黄花远志复合经营。试验区中坡位毛竹林下黄花远志生长较好,而且其入药主要部位根生物量及其分配比例较高,根与总生物量异速生长指数较大,是试验区毛竹林下黄花远志复合经营的适宜坡位。

Effects of slope positions on growth and biomass accumulation,allocation and allometry of Polygala fallax in Phyllostachys edulis forest

【Objective】The compound management of Phyllostachys edulis and Chinese herb is an important approach for enhancement of the economical and ecological benefits of bamboo forests. The growth and biomass accumulation and allocation of Polygala fallax of different slope positions in Phyllostachys edulis forest were investigated. This research will provide theoretical guidance for the compound management of forest with Phyllostachys edulis and Polygala fallax. 【Method】The compound management forest with Phyllostachys edulis and Polygala fallax was planted with two-year cutting seedlings of Polygala fallax in March 2018. Growth, biomass of leaf, stem and root of Polygala fallax of different slope positions in Phyllostachys edulis forest were investigated in April 2019. Biomass accumulation, allocation, and allometric growth were also analyzed. 【Result】The survival rate of Polygala fallax in Phyllostachys edulis forest was higher than 92% and there were no significant differences among different slope positions. With the decreasing slope, the basal diameter and height increased in fluctuation, while organs and total biomass all increased remarkably. Biomass proportions for leaf deceased markedly and that for stem and root all increased considerably. Biomass and its proportion and allometric growth indices for root-total biomass of Polygala fallax from the middle slope were highest compared to those of the other slopes. 【Conclusion】Polygala fallax can adapt to bamboo forest habitats and grow well. It is a suitable species for the bamboo forest compound management. Polygala fallax at the middle slope grew better with high biomass, especially for root biomass, and its proportions were the highest of the three slopes; the middle slope is the suitable slope for adequate growth and high value of Polygala fallax in the bamboo forest.