Effect of Species Diversity and Stand Structure on the Biomass of Arbor Layer in Forest Dominated by Quercus glauca
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摘要:
为探究物种多样性和林分结构对青冈Quercus glauca林乔木层生物量的影响，本文以2020年在浙江省9个设区市设置的138个青冈林样地为研究对象，以物种多样性、胸径、树高三个因子作为潜变量，并采用结构方程模型方法，分析了物种多样性、胸径结构和树高结构对青冈林乔木层生物量的影响。结果表明，林木胸径、树高和物种多样性对青冈林乔木层生物量具有直接和间接效应，其直接效应分别为0.17、0.35和−0.42，而通过其他因子产生的间接效应使得总效应分别提高了64.71%、20.00%和40.50%；物种多样性的负效应与青冈林中青冈的主导优势地位有关；异龄复层林经营模式有利于充分利用林内营养空间，促进青冈林生物量的积累。
Abstract:During July and September 2020, 138 sample plots with 20 m×20 m were established in the forest dominated by Quercus glauca in 9 cities of Zhejiang province, and woody plant with DBH ≥5 cm in the plots were recorded. The effect of species diversity, DBH and tree height on biomass of arbor layer was analyzed by structural equation model. The result showed that DBH, tree height and species diversity had direct and indirect effects on the biomass of the canopy layer. The direct effects are 0.17, 0.35, and −0.42, respectively, while the indirect effects through other factors increase the total effects by 64.71%, 20.00%, and 40.50%, respectively. The negative effect of species diversity was related to the dominant position of Qu. glauca.Uneven aged and multi-storied stand forestry management model is beneficial for fully utilizing the nutrient space within the forest and promoting the accumulation of biomass in Qu. glauca forests.
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Keywords:
- Quercus glauca /
- biomass /
- species diversity /
- DBH /
- tree height
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表 1 样地数量及其分布情况
Table 1 Distribution of sample plots in Zhejiang province
市 县（市、区） 样地数/个 市 县（市、区） 样地数/个 杭州 淳安 13 台州 仙居 10 富阳 5 丽水 景宁 13 建德 10 莲都 7 湖州 吴兴 1 龙泉 31 德清 1 庆元 16 金华 磐安 5 遂昌 18 武义 2 松阳 4 义乌 1 合计 138 舟山 定海 1 
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表 2 林分结构对青冈林的直接和间接效应系数
Table 2 Coefficient of direct and indirect effect of stand structure on biomass
影响因子 直接效应 间接效应 总效应 林木树高 0.17 0.11 0.28 林木胸径 0.35 0.07 0.42 物种多样性 −0.42 0.17 −0.25
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