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Interannual effects of growth, module biomass accumulation and allocation of Polygonatum cyrtonema under Phyllostachys edulis forest
LI Jianxin, XU Sen, YANG Liting, CHEN Shuanglin, GUO Ziwu
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (5) : 121-128.
PDF(1573 KB)
PDF(1573 KB)
Interannual effects of growth, module biomass accumulation and allocation of Polygonatum cyrtonema under Phyllostachys edulis forest
【Objective】Polygonatum cyrtonema is the main plant used in the compound management of bamboo forests and in Chinese medicine. This study examined the effects of planting years on the growth and biomass allocation characteristics of Polygonatum cyrtonema in the understory of Phyllostachys edulis forest to provide a theoretical reference for the efficient management of Phyllostachys edulis and Polygonatum cyrtonema. 【Method】Polygonatum cyrtonema plants grown in Phyllostachys edulis for one, two and three years were selected to investigate the growth characteristics and biomass of stems, leaves, roots, fruits and tubers during different planting years. Allometric growth of the module biomass was also analyzed. 【Result】With the increasing planting time, basal diameter, height, crown length, fruit number and population density increased significantly, whereas the number of leaves first decreased and then increased. The module biomass, aboveground biomass/underground biomass, the allocation proportion of stems, leaves, fruits and allometric growth index of stem, leaf and fruit-total biomass increased, whereas the allocation proportion of tuber and root biomass and the allometric growth index of tuber-total biomass decreased. Additionally, the allometric growth index of root-total biomass initially increased and then decreased. 【Conclusion】Planting year significantly affected the growth, population characteristics, biomass accumulation and allocation, and allometric growth of Polygonatum cyrtonema. Polygonatum cyrtonema could regulate its resource allocation to adapt to the resource limitations of different population densities. Tuber biomass increased the fastest for the plants grown for two years, but decreased obviously for the plants grown for three years, which could be considered the optimal harvesting time.
compound management of bamboo forests and Chinese medicine / Polygonatum cyrtonema / cultivation years / allometric growth / biomass accumulation and allocation
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