JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2): 79-85.doi: 10.12302/j.issn.1000-2006.202209048

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Effects of fertilization application on quantity and quality recovery of restoring strip-harvested moso (Phyllostachys edulis) bamboo forests

LI Chengji1(), GUAN Fengying1,2,*(), ZHOU Xiao1,2, ZHANG Xuan1,2, ZHENG Yaxiong1,2   

  1. 1. Key Laboratory on the Science and Technology of Bamboo and Rattan, International Centre for Bamboo and Rattan, Beijing 100102, China
    2. National Location Observation and Research Station of the Bamboo Forest Ecosystem in Yixing City of Jiangsu Province, Wuxi 214200, China
  • Received:2022-09-20 Revised:2023-02-09 Online:2024-03-30 Published:2024-04-08

Abstract:

【Objective】 Moso bamboo (Phyllostachys edulis) is an integral part of China's forest resources, and strip harvesting is an efficient and mechanizable novel bamboo forest management mode. This study aimed to investigate the promotion effect of proportional fertilization on the post-harvesting recovery of forest stands and select the most suitable fertilizer ratio, providing a reference for the efficient and sustainable management of moso bamboo forests.【Method】 In the state-owned Yixing Forest Farm, in selecting the area with favorable site conditions, we selected a pure stand of old-growth moso bamboo and set up a fertilization experiment with three fertilization mass ratios of N to P2O5 to K2O is 2.0∶1.0∶1.0, 3.5∶1.0∶2.0 and 5.0∶1.0∶2.5 (F1, F2 and F3, respectively) after strip harvesting with an 8-m bandwidth. The main productivity indicators of the forest land [such as the number of shoots, percentage of mature bamboo trees, diameter at breast height (DBH) characteristics of the new bamboo] were investigated and explored the response mechanism of the quality and quantity characteristics of standing bamboo to fertilization during the restoration process of strip-cutting moso bamboo forests through data comparison, variance analysis, linear relationship fitting, and other pertinent statistical methods.【Result】 (1)Fertilization could significantly induced new shoot emergence, but the phenomenon of shoot retreat within the stand was evident, the stand splitting rate was significantly reduced, and the stand density of the fertilization treatment did not significantly different from that of the control treatment, indicated that the quantitative characteristics of the stand returned to the pre-harvesting level;(2)The F2 and F3 treatments were able to significantly increase the average DBH of the new bamboo and the proportion of medium- and large-diameter bamboo trees. The diameter at breast height-height (DBH-H) scatter relationship of the new bamboo in the F2 treatment was close to that of the traditional management model, indicating that the qualitative characteristics of the stand were significantly improved. 【Conclusion】 The quantitative and qualitative characteristics of moso bamboo stands recovered by strip harvesting varied in response to different fertilizer ratios, but the quantitative characteristics could be restored to pre-harvesting levels, and the quality characteristics could be significantly improved by high N and K fertilizer ratios, with the most profound effect being induced by an mass ratio of N to P2O5 to K2O is 3.5∶1.0∶2.0.

Key words: moso bamboo (Phyllostachys edulis), strip harvesting, fertilization mass ratio, quality recovery, standing bamboo's density

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