不同径级云南松各部位生物量及其分布规律
Biomass Distribution Pattern of Different Parts of Pinus Yunnanensis with Different Diameter Class
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摘要: 利用标准木法测定了不同径级云南松人工林生物量及生物量在垂直方向上的分布规律。结果表明:云南松生物量随径级的增大而增大,5~7.5 cm径级云南松生物量为(6.642±1.129)×103 g·株-1;7.6~12.5 cm径级为(2.533±0.387)×104 g·株-1;12.6~17.5 cm径级为(5.897±1.331)×104 g·株-1;17.6~22.5 cm径级为(1.063±0.211)×105 g·株-1;≥22.6 cm径级为(2.208±0.409)×105 g·株-1。在不同径级组成中云南松各器官生物量的分配比例存在一定的变化:随着径级的增大,主干和根部生物量呈现先下降后上升的趋势,枝和叶生物量占总生物量的比例为先升高后降低,而树皮的比例则一直下降。主干生物量在0~2 m高度层最大,占总生物量的27.62%。6~8 m高度层枝、叶生物量最大,分别占各自总生物量的35.85%、38.34%。云南松根系生物量主要分布在0~30 cm土层深度内,占总根系生物量的65.49%。Abstract: The normal tree method was used to measure the biomass of Pinus yunnanensis and its distribution pattern with different diameter class in Tianzimiaopo Forest Farm, Nanhua County, Yunnan Province. The results indicated that the biomass was positively correlated with the diameter class. For the diameter class of 5~7.5 cm, the individual biomass was(6.642±1.129)×103 g, for the diameter class of 7.6~12.5 cm, it was(2.533±0.387)×104 g, for the diameter class of 12.6 17.5 cm, it was (5.897±1.331)×104 g, for the diameter class of 17.6~22.5 cm, it was (1.063±0.211)×105 g, and for the diameter class above 22.6 cm, it was (2.208±0.409)×105 g. There existed some changes in the biomass distribution among P. yunnanensis’ organs with different diameter class. With the increase of diameter, the biomass proportion of stem and root decreased in initial stage and then increased, that of branch and needle increased in the initial stage and then decreased, while that of bark decreased. The biomass proportion of stem was the largest in layer of 0~2 m, which accounted for 27.62% of total biomass and that of the branch and needle were the largest in the layer of 6~8 m, which accounted respectively for 35.85% and 38.34% of the total biomass. Approximately 65.49% of total root biomass of P. yunnanensis distributed in the surface layer of 0~30 cm, and 34.51% in the other layers. Key word: Pinus yunnanensis;plantation;biomass;distribution
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Key words:
- Pinus yunnanensis
- / plantation
- / biomass
- / distribution
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