3种常见园林树木幼苗生长与生物量研究

Study on Growth and Biomass of 3 Species of Landscape Tree Seedlings

以阴香Cinnamomum burmannii、山杜英Elaeocarpus sylvestris、铁冬青Ilex rotunda 3种常见园林树木幼苗为研究对象,对其形态特征和生物量分配进行测量评估及相关分析。结果表明,3种植物幼苗株高、地径的生长较为整齐,但其生物量表现不一;铁冬青的地下生物量显著高于其他两种树木(P<0.05);而阴香的地上生物量和总生物量最高,且与其他两种树木差异显著(P<0.05)。三种树木幼苗茎质量比差异不显著;根质量比从高到低依次为铁冬青、山杜英、阴香,铁冬青显著高于山杜英和阴香(P<0.05);叶质量比与根质量比相反,且三者差异显著(P<0.05);体积指数、Dickson质量指数与树木幼苗生物量显著相关(P<0.05),其中又以Dickson质量指数相关性更强,可用于园林树木幼苗指标评估;地上干重与总生物量之间存在极显著相关性(P<0.01)。

The morphological characteristics and biomass allocation of three species of landscape tree seedlings, Cinnamomum burmannii, Elaeocarpus sylvestris and Ilex rotunda, were measured and evaluated. The results showed that the shoot height and diameter of three plant seedlings were relatively uniform, but seedlings biomasses of three species of landscape tree were different. Ilex rotunda had a highest underground biomass, and significant difference compared to C. burmannii and E. sylvestris（P〈O.05）. While C. burmannii had a highest aboveground biomass and total biomass, and significant difference compared to I. rotunda and E. sylvestris（P〈O.05）. There was no significant difference between stem mass ratio of seedlings of 3 species, but root and leaf mass ratios were different. Root mass ratio of I. rotunda was significantly higher than E. sylvestris and C. burmannii. Leaf mass ratios of three plant seedlings were significantly different（P〈0.05）, C. burmannii was highest. Bulk index and Dickson quality index were significantly correlated with biomass（P〈0.05）, but Dickson quality index was more relevant to be used for evaluation of garden tree seedling, there was a highly significant correlation between aboveground dry biomass and total biomass（P〈0.01）.