陡坡地毛竹林多花黄精种群生长和生物量分配的坡位效应

Effects of Slope on Population Growth and Biomass Allocation of Polygonatum cyrtonema in Phyllostachys edulis Forest

以林分结构基本一致的陡坡地粗放经营毛竹纯林为对象,调查分析了同一面坡不同坡位毛竹林(Phyllostachys edulis(Carr.)H.de Lehaie)下多花黄精(Polygonatum cyrtonema Hua.)种群的生长状况和生物量积累与分配规律。结果表明:不同坡位毛竹林下多花黄精的种群密度、叶片叶绿素值和叶、根生物量积累及叶、根、地下块茎生物量分配比例均无显著差异。不同坡位毛竹林下多花黄精生物量分配格局均为地下块茎>根>叶≈地上茎,地下块茎生物量分配比例占70%以上,而其它器官的生物量分配较为均匀。毛竹林下多花黄精种群生长和生物量积累与分配具有明显的坡位效应,在试验毛竹林林分结构和经营水平一致的情况下,宜选择下坡位进行毛竹多花黄精复合经营。

The growth and biomass allocation ofPolygonatum cyrtonema at different slope positions were studied under extensive managed and structure consistent Phyllostachys edulis forest. The results showed that population density, leaf chlorophyll values, biomass accumulation of leaves and roots, and biomass distribution pattern in leaves, roots and tubers of P. cyrtonema had no significant differences among different slope positions in bamboo forest. The biomass distribution patterns of P. cyrtonema at different slope positions were order as tuber biomass 〉 root biomass 〉 leaf biomass ≈ stem biomass, and tuber biomass was more than 70% of total biomass, while biomass allocated in roots, leaves, and stems were uniform. There was obvious slope effect on population growth, biomass allocation of Polygonatum cyrtonema in bamboo forest. Under consistent of stand structure and management in bamboo forest, lower slope was considered to compound management with P. cyrtonema.