<正>研究了丛生竹种大木竹（Bambusawenchouensis）种群的生物量结构，并对其各器官生物量与胸径（I）BH）和地径的相关模型进行了拟合。结果表明：大木竹各器官生物量的分配中，竹秆所占比例较大，为总生物量的73.1%。远超过毛竹（Phyllostachysedulis）等竹种的相应值。大木竹各器官生物量之间及其与胸径、地径闻均具有较好的相关性，其中鲜秆质量（W1）、全株鲜质量（W4）与胸径（D）间相关关系的拟合模型W1=0.3703D2.0922和W4=0.5122D2.0391，可以较准确地估算出各器官生物量的大小。

The wood density of 16 Taxodiurn distichum provenances was studied. The results were as follows: (1) The air-dry density, complete-dry density and basic density of 16 provenance had a significant difference, and the air-dry density, complete-dry density and basic density of No. 5, No. 4 and No. 3 provenances were all highest, and those of No. 10 provenance were lowest; (2) The total variation coefficients of the air-dry density, complete-dry density and basic density of 16 provenances were 7.96%, 8.92% and 8.92% respectively, and variation ranges were 0.3232~0.5104g/cm3, 0.2933~0.4629g/cm3 and 0.2685~0.400 4g/cma respectively; (3) Wood basic densities from base to top of the stem had a significant variation, and wood basic density increased with increasing of tree height~ (4) The radial variation of wood basic density in different positions of stem had a different changing trend, and the wood basic density had a changing trend of low-high-low from marrow to north, and the changing trend from marrow to south was different in different conditions of stem.