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

In order to establish a theoretical basis for compound management of Polygonatum cyrtonema in Phyllostachys edulis forest, we studied the population growth conditions, biomass accumulation and allocation rules of P. cyrtonema at one side upper , middle, and lower slopes in extensive managed and structure consistent Ph. edulis forest. The results showed that population density, leaf chlorophyll values, biomass accumulation of leaves and roots, and biomass distribution pattern of leaves, roots and underground tubers of P. cyrtonema had no significant differences at different slope positions in Ph. edulis forest. Plant height had no significant differences between lower slope and upper slope, while the two slopes were significantly higher than middle slope. Diameter had no significant differences between lower slope and middle slope, while the two slopes were significantly lower than upper slope. Ground stems biomass had no significant differences between middle slope and upper slope, while the two slopes were significantly lower than lower slope. Underground tubers biomass, total biomass accumulation at lower slope were significantly higher than the ones at middle slope, while had no significant differences between the two slopes and upper slope. Biomass distribution pattern of ground stems at lower slope were significantly higher than the one at upper slope, while had no significant differences between the two slopes and middle slope. The biomass distribution patterns of P. cyrtonema were that the underground tubers biomass allocated more than 70% of the total, significantly greater than the sum of roots, leaves, and stem grounds whose biomass allocations were more uniform in Ph. edulis forest at different slope positions. There was obvious slope effect on population growth, biomass accumulation and allocation of Polygonatum cyrtonema in Phyllostachys edulis forest. Under the level of stand structure and operating conditions in test Ph. edulis forest, lower slope was considered to be chosen to carry out compound management of P. cyrtonema in Ph. edulis forest.