密度对乐昌含笑幼苗的生长和生物量的影响

Effects of planting density on growth and biomass of Michelia chapensis seedlings

以1年生乐昌含笑Michelia chapensis实生苗为试验材料,采用盆栽法,在美植袋中分别种植1、2、4、8株幼苗(密度I、II、III、IV),研究密度对幼苗的形态生长和生物量的影响。研究结果表明,幼苗的地径随着密度增大而减小,而苗高为密度I>密度III>密度II>密度IV。每盆幼苗的总生物量随密度增大而增加,幼苗单株幼苗各器官干重(根、干、枝、叶)和幼苗单株干重均随密度增加而减少,其干重为根>干>叶>枝,各密度的根冠比小于1。

Density effects on growth and seedling biomass ofMichelia chapensisseedlings were studied by using pot-culture method. The seedlings were planted with four different densities （density of I, II, III and IV）： 1, 2, 4 and 8 seedlings in each plant bag. The results show that with increasing density, the mean ground diameter of M. chapensisseedlings decreased, whereas the mean seedling height decreased in the order： density I〉 density III〉 density II〉 density IV; The mean seedling dry weight decreased with the increasing of density, the organ dry weight was ranked as： roots〉 stem〉 leaves〉 branches and the root-shoot ratio with different densityM. chapensis seedlings were less than 1.