JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (2): 165-170.doi: 10.12302/j.issn.1000-2006.202003013

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Responses of tuber biomass accumulation and its allometry to topping and flower plucking measures of Polygonatum cyrtonema grown under Phyllostachys edulis forests

YANG Qingping1(), CHEN Shuanglin1, GUO Ziwu1,*(), ZHENG Jin2   

  1. 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, China
    2. Jiangshan Forestry Technology Promotion Station, Jiangshan 324100, China
  • Received:2020-03-04 Accepted:2020-05-07 Online:2021-03-30 Published:2021-04-09
  • Contact: GUO Ziwu E-mail:yangqp@126.com;hunt-panther@163.com

Abstract:

【Objective】The compound management of bamboo forests is regarded as an efficient, intensive and ecological land management pattern of bamboo forest management. Polygonatum cyrtonema grown under Phyllostachys edulis (moso bamboo) forest is one of the typical patterns of the compound management of bamboo forests. Topping and flower plucking can reduce nutrient demands for the reproductive growth or weaken apical dominance of Polygonatum cyrtonema, and can also promote transportation and allocation of nutrients and carbon assimilation to tubers. The study of the effects of topping and flower plucking on the growth of tubers will provide a theoretical guidance for the compound management of forests with Phylpstachys edulis and Polygonatum cyrtonema. 【Method】Biomass of annual and perennial tubers and root from 3-year-old Polygonatum cyrtonema grown under Phyllostachys edulis were determined. The biomass accumulation, allocation and allometric growth of annual and perennial tubers and root biomass were also analyzed. 【Result】Compared to the control (CK), biomass of annual tubers and its allocation in plants treated with topping, flower plucking, and combination of flower plucking and topping increased significantly; however, biomass allocation to perennial tubers decreased considerably. Furthermore, biomass of annual tubers and its allocation in plants treated with flower plucking were slightly higher than those treated with topping; however, those treated with the combination of both treatments were evidently higher than those treated with flower plucking or topping. The allometric growth index for perennial tubers-total tubers biomass of plants treated with topping, flower plucking, and combination of flower plucking and topping increased slightly, but those for the annual tubers-total tubers biomass of topping, flower plucking, and combination of topping and flower plucking increased significantly. The allometric growth index for tubers-total tuber biomass of flower plucking and topping was the highest among all the four treatments. 【Conclusion】Topping and flower plucking regulated the growth polarity and source-sink relationship and induced the directional transportation and allocation of carbon assimilation and nutrients. The biomass of annual tubers, its allocation and the allometric growth rate of flower plucking and topping treatment increased significantly, which is thus a suitable approach to promote the tuber growth for the compound management of forests with Phyllostachys edulis and Polygonatum cyrtonema.

Key words: topping, plucking flower, Polygonatum cyrtonema, compound management of moso bamboo (Phyllostachys edulis), biomass accumulation and allocation

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