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本文以双重抽样和相对变比生长模型(y=ax~be~(cx))测定米槠人工林在疏开状态下的生产量。10年生米槠林分生物量为72.317t·ha~(-1),其中乔木层、灌木层和草本层分别为71.404、0.305和0.606t·ha~(-1),乔木层占98.74％;乔木层中树干(包括树皮)、树枝、叶和根系的生物量分别为26.410、24.170、7.413和13.411t·ha~(-1),树冠生物重占44.23％,产生较大的倾斜分配。林分叶面积指数为5.478m~2/m~2,林木现存单株生物量达到166.45±62.55kg。林分生长质量好,Ⅰ级木生物量占47.77％。
In this paper, the double sampling and relative variable ratio growth model (y = ax ~ be ~ (cx)) was used to measure the yield of poplar plantation in open state. The biomass of 10-year-old stands was 72.317t · ha -1, including 71.404, 0.305 and 0.606t · ha -1 for tree layer, shrub layer and herb layer, and 98.74% for tree layer. The biomass of tree trunks (including bark), branches, leaves and roots in arbor layer were 26.410, 24.170, 7.413 and 13.411 t ha -1, respectively. Crown biomass accounted for 44.23% of the tree layer, resulting in a large slope distribution. The stand leaf area index was 5.478m ~ 2 / m ~ 2, and the existing single plant biomass reached 166.45 ± 62.55kg. Stands of good quality, Ⅰ grade wood biomass accounted for 47.77%.