作　　者： ; ;

机构地区： 华南师范大学生命科学学院生物科学系

出　　处： 《热带亚热带植物学报》 1999年第1期37-46,共10页

摘　　要： 以膨胀珍珠岩为基质，在光和暗的条件下，对２４种南亚热带森林乔木的种子萌发和幼苗生长进行了研究。种子的形态和重量与种的演替阶段有关，种子的重量也与不同的种有关。不同种的萌发率差异较大，种子较大的种，萌发率较高。肉质果实的种子，开始萌发的时间较长。光和暗条件对萌发率和萌发速度无明显影响。幼苗高度和种子重量呈正相关，这一相关在光条件下比暗条件下更明显。暗条件明显地引起群落演替早期的树种的茎徒长，限制根的生长，而对演替后期种无显著的影响。幼苗地上部分和根系生物量的分配与种的演替阶段有关，也与不同的科有关。幼苗地上部分和根系生物量的分配也受光暗条件的影响，而不受种子重量的影响。根和叶的生物量分配和种在其群落演替阶段有关。幼苗的生物量与种子重量有显著的正相关。幼苗的相对生长率相差较大，在没有营养供应的生长基质中，以演替中间阶段的种的相对生长率较大。幼苗从种子的物质利用效率与种子重量呈负相关，而与种的演替阶段无明显的相关。 Seed morphology and germination, seedling morphology and biomass of 24 treespecies in the lower subtropical forest of China were studied comparatively in light anddark conditions on expanded perlite as germination and growth medium. Seed morphologyand seed mass were related with species of different successional stages of the forest andwith species from different families. Percentage of germination was obviously differentamong various species. Heavier seeds had higher percentages. Seeds from pulpy fruitusually showed significantly later germination. Light and dark conditions did notsignificantly affect germination percentage and germination speed of the species. Seedlingheight was positively correlated with seed weight. The correlation between seed weight andseedling height seemed to be more obvious under light treatmetn.Dark condition caused the stem etiolation and limited the growth of root of the early seral (successional) species.However it was not so obvious for late seral species. Seedlings of about half of the specieshad higher shoot biomass than root biomass in both light and dark conditions. Shoot androot biomass allocation was related with different families, and with different seral stages ofthe species. It was also affected by light and dark conditions. Seed weight appeared not toaffect the biomass ratio of shoot to root in seedlings. Root and leaf biomass allocationwere related with species. Biomass of the seedlings was positively related with seed weight.Relative growth rate (RGR) of the seedlings without nutrient supply was quite differentamong the species. Higher RGR was found in the mid seral species. Matter utilization efficiency(MUE) of the seedling from seed was obviously negatively related with seed weight, andappeared not to be related with seral stages of the species.

关 键 词： 南亚热带森林 乔木 种子萌发 幼苗生长

领　　域： [生物学]