闽西北杉木退化林综合抚育生长效果分析

    Growth Effect Analysis of Comprehensive Tending on Degraded Cunninghamia lanceolata Plantations

    • 摘要: 为探究"割灌除草+合理修枝+配方施肥"一体化抚育方案对闽西北中度退化杉木人工林的修复效果,以将乐县大源乡13年生杉木退化林为研究对象,2022年11月开展标准化综合抚育,并于2025年10月(抚育后第3年)开展终期定位监测,结合抚育前本底数据计算年均生长指标。结果表明:综合抚育可显著恢复退化杉木生长能力,抚育组胸径、树高、冠幅、单株材积年均生长量较对照组(自然生长状态)分别提升33.5%、25.0%、18.6%、36.5%;4项指标组间差异均极显著(P<0.01)。抚育处理下杉木胸径生长提升幅度大于树高,冠幅出现补偿生长,材积/胸径比值显著提高,径材转化效率显著改善,林木生长量与干形品质同步提升,可为区域退化杉木林精准抚育、森林质量提升提供参考。

       

      Abstract: To explore the restoration effect of the integrated tending scheme of "shrub-weeding + reasonable pruning + formula fertilization" on moderately degraded Cunninghamia lanceolata plantations in northwest Fujian, a 13-year-old degraded Chinese fir stand in Dayuan Township of Jiangle County was selected as the research object. Standardized comprehensive tending was implemented in November 2022, and tree-growth indicators were monitored. Post-tending growth was assessed at the 3rd year(October 2025). The results showed that comprehensive tending could significantly restore the growth capacity of degraded Chinese fir. Compared with the control group, the average annual increments of DBH, tree height, crown width and individual-tree volume in the tending group increased by 33.5%, 25.0%, 18.6% and 36.5%, respectively. There were extremely significant inter-group differences in all four indicators(P<0.01). The increase amplitude of DBH growth of Chinese fir under tending treatment was greater than that of tree height, and compensatory growth occurred in crown width. The volume-to-DBH ratio analysis showed that tending significantly improved stem fullness and diameter-volume conversion efficiency, with simultaneous improvement in tree growth and stem quality. This study can provide references for precise tending and forest-quality improvement of degraded Chinese fir stands in the region.

       

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