带状采伐对新生毛竹空间结构及稳定性的影响

肖箫, 周阳, 王树梅, 郑亚雄, 官凤英

南京林业大学学报（自然科学版） ›› 2023, Vol. 47 ›› Issue (4) : 139-147.

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南京林业大学学报（自然科学版）
PDF(2957 KB)
南京林业大学学报（自然科学版） ›› 2023, Vol. 47 ›› Issue (4) : 139-147. DOI: 10.12302/j.issn.1000-2006.202110055
研究论文

带状采伐对新生毛竹空间结构及稳定性的影响

作者信息 +

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

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文章历史 +

摘要

【目的】带状采伐是毛竹资源高效经营的重要技术手段,研究带状采伐后新生毛竹空间结构一元、二元分布特征及稳定性,比较不同采伐处理空间结构恢复效果,为带状采伐技术评价和后续经营提供科学依据。【方法】以实施不同宽度带状采伐处理后的两度新竹为研究对象,利用新竹混合度、大小比数和角尺度对比不同采伐处理与未采伐对照样地的新生竹空间结构变化情况,并采用基于空间结构指数的林分空间结构生产函数评价新生竹稳定性。【结果】①带状采伐后两度新竹的平均混合度较对照减少2.90%~23.75%,新竹处于弱度混合到中度混合之间(新竹混合度为0.395~0.503),零度混合的新竹比例增大;新生竹整体保持中庸状态(大小比数为0.506~0.545),除带状采伐宽度15 m(15M)处理外,优势新竹的比例较对照样地有所增长,且随采伐宽度增大而减小;带状采伐未改变新生竹空间分布格局,新生毛竹始终呈现随机分布状态。②处于优势状态且强度混合、随机分布且强度混合的新生竹比例较对照分别减少3.74%~7.65%和3.21%~12.82%,处于中庸到优势状态且随机分布的新竹比例整体略大于对照样地,带状采伐宽度5 m(5 M)处理下结构优越的新生竹比例在各处理中最大。③带状采伐降低了新生竹空间结构稳定性,采伐宽度越大,稳定性恢复效果越差。【结论】带状采伐不改变新生竹空间格局和整体优势状态,新生竹混合度减小,优势微结构比例减小,新竹空间结构仍处于恢复过程,未来应及时疏除聚集分布且基径偏小的新笋,提高优势且随机分布新竹的比例。

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.

关键词

毛竹 / 带状采伐 / 新生竹 / 空间结构

Key words

Phyllostachys edulis / strip cutting / new bamboo / spatial structure

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肖箫, 周阳, 王树梅, 等. 带状采伐对新生毛竹空间结构及稳定性的影响[J]. 南京林业大学学报（自然科学版）. 2023, 47(4): 139-147 https://doi.org/10.12302/j.issn.1000-2006.202110055
XIAO Xiao, ZHOU Yang, WANG Shumei, et al. Effects of strip cutting on spatial structure and stability of new bamboo (Phyllostachys edulis)[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(4): 139-147 https://doi.org/10.12302/j.issn.1000-2006.202110055
中图分类号： S757;S795   

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基金

国际竹藤中心基本科研业务费专项项目(1632022018)
国际竹藤中心基本科研业务费专项项目(1632023013)
国家重点研发计划(2018YFD0600103)

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