JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (4): 139-147.doi: 10.12302/j.issn.1000-2006.202110055

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Effects of strip cutting on spatial structure and stability of new bamboo (Phyllostachys edulis)

XIAO Xiao(), ZHOU Yang, WANG Shumei, ZHENG Yaxiong, GUAN Fengying()   

  1. Key Laboratory of National Forestry and Grassland Administration, Beijing for Bamboo & Rattan Science and Technology, International Center of Bamboo and Rattan, Beijing 100102, China
  • Received:2021-10-28 Revised:2022-12-06 Online:2023-07-30 Published:2023-07-20

Abstract:

【Objective】Strip cutting is an important technical mean for efficient management of bamboo resources. The univariate and binary distribution characteristics of spatial structure of new bamboo after two shoot years of strip cutting were studied, and the new bamboo stability was also analyzed, in order to compare the restoration effects of spatial structure of different treatments and provide a scientific basis for the evaluation of strip cutting technology and subsequent management. 【Method】The new bamboo of two shooting years after strip cutting with different widths was taken as the research object. The spatial structure changes of new bamboos in different treatments and CK were compared by the stand spatial structure parameters, such as mingling, dominance and uniform angle of new bamboos. The stand spatial structure production function based on spatial structure index was used to evaluate the stability of new bamboo. 【Result】(1) The average mingling of the new bamboos after strip cutting was reduced by 2.90%-23.75% compared with CK, and the new bamboos were between weak to moderate mingling (new bamboo mingling M= 0.395-0.503). The proportion of new bamboo mingled with zero degree in each treatment increased and new bamboo remained in a moderate state (domiance U= 0.506-0.545). Except for 15M, the proportion of dominant new bamboos increased compared with CK, and decreased with the increase of harvesting width; Strip cutting did not change the spatial distribution pattern of new bamboo, which always showed a random distribution state. (2) The proportion of new bamboo in dominant state and mingled intensity, randomly distributed and mingled intensity decreased by 3.74%-7.65% and 3.21%-12.82% respectively compared with CK. The proportion of new bamboo in moderate to dominant state and randomly distributed was slightly larger than CK. The proportion of new bamboo with better structure within 5M was the largest in each treatment. (3) Strip cutting reduces the stability of spatial structure of new bamboo. The larger the cutting width, the worse the stability restoration effect. 【Conclusion】Strip cutting does not change the spatial pattern and overall dominant state of new bamboo, and the mingling of new bamboo is decreased. The proportion of dominant microstructure is reduced, and the spatial structure of new bamboo is still in the recovery process. In the future, new shoots with small base diameter should be removed in time to improve the proportion of dominant and randomly distributed new bamboos.

Key words: Phyllostachys edulis, strip cutting, new bamboo, spatial structure

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