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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (4): 79-87.doi: 10.11707/j.1001-7488.LYKX20210803

• Research papers • Previous Articles     Next Articles

Effects of Strip-cutting Width on the Structural Characteristics of Underground Bamboo Rhizome in Moso Bamboo Forests

Zongming Cai1(),Zhiwen Deng1,Bingjun Li1,Shikun Li2,Weiqing Wen2,Jundong Rong1,Yushan Zheng1,Liguang Chen1,*   

  1. 1. College of Forestry, Fujian Agriculture and Forestry University Fuzhou 350002
    2. Zhangping Forestry Bureau Longyan 361000
  • Received:2021-10-26 Online:2023-04-25 Published:2023-07-05
  • Contact: Liguang Chen E-mail:462081255@qq.com

Abstract:

Objective: In this study, the effect of strip cutting with different widths on the structural characteristics of underground rhizomes of Phyllostachys edulis was investigated, in order to explore the adaptation mechanism of underground rhizome system of P. edulis to strip cutting with different widths, and provide a theoretical basis for the scientific management of P. edulis forests. Method: A pure bamboo forest with the same site conditions, bamboo age structure, and slope aspect was targeted, and strip cuttings were conducted with three different strip widths, 6 m, 8 m, and 10 m, and a strip length of 30 m. The same standard reserved bands between the cutting strips were set. In October 2019, the bamboo rhizome characteristics in the different width cutting bands and reserved bands were investigated. The total rhizome length, rhizome node number, average rhizome diameter, average internode length, rhizome dry weight and other indicators in different soil layers and different rhizome age were measured, and the indicators were used for analysis of their response differences to different logging bandwidths. Result: 1 ) The total length and dry weight of bamboo rhizome in 8 m cutting band were significantly greater than those in 6 m cutting band ( P < 0.05 ), but had no significant difference with those in 10 m cutting band. The average rhizome diameter of 8 m cutting band was significantly smaller than that of 10 m cutting band ( P < 0.05), but not significantly different from that of 6 m cutting band. The number of rhizome nodes in 8 m cutting band was significantly greater than that in 6 m and 10 m cutting bands ( P < 0.05). There was no significant difference in the average internode length of bamboo rhizome among the three width cutting bands, but the length showed a decreasing trend with the increase of bandwidth. Compared with the reserved strip, the total rhizome length, rhizome node number and rhizome dry weight of three kinds of cutting strips showed an increasing trend. 2) Compared with the retention zone, the structural characteristics of the each rhizome age stage showed different amplitudes of variation among different width cutting zones. In the young rhizome section, the total rhizome length, average internode length and rhizome dry weight in the 8 m bandwidth harvesting band increased by 49.20%, 45.48% and 58.38%, respectively. In the middle-aged rhizome section, the total rhizome length, rhizome number and rhizome dry weight in 6 m and 8 m cutting bands increased significantly ( P < 0.05). In the old rhizome section, the total rhizome length, rhizome node number and rhizome dry weight of bamboo rhizomes in the 6 m and 8 m cutting bands decreased, while those in the 10 m cutting band was the opposite. 3) In 0–20 and 20–40 cm soil layers, the number and dry weight of rhizomes in 8 m and 10 m cutting bands were significantly greater than those in reserved bands ( P < 0.05). In 0–20 cm soil layer, the total rhizome length, number and dry weight of rhizomes in 8 m cutting band were 80.83%, 87.50% and 45.27% greater than those in reserved band, and the average rhizome diameter and average internode length in 10 m cutting band were 7.25% and 5.34% smaller than those in reserved band. In 20–40 cm soil layer, the five indexes of bamboo rhizome in 8 m cutting band were greater than those in retaining band, especially the increments of total rhizome length, rhizome node number and rhizome dry weight were significant. 4) The total number of rhizome buds in the cutting zone was generally more than that in the retention zone. The total number of rhizome buds in the 8 m cutting zone was significantly greater than that in the 6 m and 10 m cutting zones ( P < 0.05). There was no significant difference in the total number of rhizome buds in the retention zones between the three different bandwidths. The proportion of weak buds of bamboo rhizomes harvested in different widths was higher than that of strong buds. The proportion of strong buds in 8 m cutting band was the highest (33.75%), and the proportion of empty buds in 6 m cutting band was the highest (18.26%). Conclusion: Reasonable cutting bandwidth can promote the extension and expansion of underground bamboo rhizome, further affect the yield and quality of bamboo shoots and timber, improve the economic benefits of bamboo forest management, and also provide effective solutions for the future mechanized management of bamboo forests. In this study, the indexes of bamboo rhizome with 8 m band width are better than those with 6 m and 10 m band width. Therefore, 8 m band width can be used as a reference for future mechanized management of bamboo forest.

Key words: moso bamboo, strip clearcutting, bamboo rhizome, quantitative characteristics

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