西双版纳热带季节雨林145个树种繁殖体特征

Diaspore Traits of 145 Tree Species from a Tropical Seasonal Rainforest in Xishuangbanna,SW China

分析了西双版纳热带季节雨林20公顷动态监测样地中145个树种的繁殖体特征。结果表明:雨季散布的种类最多(71.03%),在雾凉季及干热季散布的种类相对较少;果实类型以核果,蒴果,浆果居多,黑色、黄色、褐色果实最为常见;动物散布的种类最多(56.55%),其次为机械散布,独立散布,风力散布;大种子树种(种子最大长度>10mm)较占优势(53.10%);树种单粒种子重量从2.3×10-5～22.29g不等,但76.55%的种子的重量集中在0.01～10g之间;干热季散布的种子平均重量显著高于雨季和雾凉季;独立散布的种子重量最大,风力散布的种子重量最小,而机械弹射的种子重量和动物散布的种子重量之间差异不显著;树种的成年个体最大胸径与种子重量之间存在显著正相关。

In this paper,we described fruit and seed traits of 145 tree species from a 20 ha tropical seasonal rainforest dynamics plot. The fruiting of most tree species occurred in rainy season（71.03%）. Fewer species had fruit in dry season. Flesh fruits,such as drupes,capsules and berries,were very common in the plot and,fruits were mainly black,yellow and brown colored. Most species were animal dispersed（56.55%）. Species with large seeds（maximum seed length 10 mm）were predominate（53.10%）,followed by medium-sized seeds（2-10 mm）,and small seeds（2 mm in length）. Seed mass varied from 2.3×10^-5 to 22.29 g,the majority of species（76.55%） produced seeds with a mass ranged from 0.01 to 10 g. The mass of seeds collected exhibited a significant seasonal changes. Seeds collected in rainy season were heaver than seeds collected in dry season. Unassisted dispersal species tended to have large seed,and species dispersed by wind tended to have small seeds. A significant positive correlation was found between the seed mass and maximum DBH of the species.