Stand spatial structure for an uneven-aged Cunninghamia lanceolata ecological forest
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摘要: 为了优化杉木Cunninghamia lanceolata生态公益林空间结构,充分发挥其生态、经济和文化等多项功能,以湖南省福寿林场杉木生态公益林9个固定样地林分空间结构的实测数据,采用混交度、大小比数和角尺度对比分析了不同龄组杉木生态公益林的空间结构特征。结果表明:杉木幼龄林的平均混交度为0.19,为0度混交和弱度混交的中间状态,杉木中龄林和成熟林的平均混交度为0.09和0.04,接近0度混交状态,3个龄组杉木林的林分混交度都偏低,林分稳定性差;杉木幼龄林、中龄林和成熟林的平均大小比数分别为0.51,0.52和0.52,接近中庸状态,说明林木个体差异不大,林木分化不严重;平均角尺度分别为0.37,0.35和0.34,为均匀分布和随机分布的中间状态,不是理想的林木水平分布格局。图4表4参14Abstract: To optimize the spatial structure of a Cunninghamia lanceolata ecological forest and use of its ecological, economic, and cultural functions, nine permanent sample plots(20 m 30 m) at the Fushou Forest Farm in Hunan Province were analyzed for variation in spatial structure of uneven age-group stands using three spatial structure indexes: the mingling index, the neighborhood comparison, and the uniform angle index. Results showed an average mingling degree for juveniles of 0.19 which belonged to the transitional type between zero and weak mingling. The average degree of mingling for medium (0.09) and mature (0.04) trees was close to zero mingling. The average neighborhood comparison for stand DBH was juvenile (0.51), medium (0.52), and mature trees (0.52) which were close to the moderate state. The average stand uniform angle indexes were juvenile (0.37), medium (0.35), and mature (0.34) belonging to the transitional types of uniform and random distributions. Overall for the C. lanceolata stands, mingling showed that the ecological forest rating was low, and the stability of the stand structure was weak; the neighborhood comparison indicated that the number of trees in diameter classes was roughly equal; and the uniform angle index revealed poor horizontal distribution patterns in juvenile, medium, and mature stands. [Ch, 4 fig. 4 tab. 14 ref.]
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Key words:
- forest management /
- Cunninghamia lanceolata /
- ecological forest /
- spatial structure
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.01.012
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