The seed bank of Eupatorium odoratum along a successional gradient in a tropical rain forest in Ghana
The seed bank of Eupatorium odoratum along a successional gradient in a tropical rain forest in Ghana
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加纳热带雨林中连续梯度的紫茎泽兰种子库
DOI：
10.1017/s0266467400001887
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发表时间：
1987
影响因子：
1.4
通讯作者：
G. A. Epp
中科院分区：
文献类型：
--
作者：
G. A. Epp
加纳大学农业研究站在卡德附近对定殖杂草飞机草的可发芽种子库进行了研究。五个网站，代表不同的演替阶段被选中：一个封闭的树冠森林，帐篷树冠森林，次生林，农业用地，和烧毁的森林。在每个地点随机抽取25个土壤样品（每个500 cm 3; 10×10×5 cm）用于发芽试验。次生林样地的飞机草种子数（8428粒/m2）显著高于其他4个样地。飞机草种子库占总种子库的81%，其萌发速度明显快于其它植物。结果表明，土壤种子库的存在可能取决于：（1）允许种子积累的时间;（2）散布种子的生境可达性;（3）区域内发生的干扰类型;（4）定殖物种的散布能力;（5）物种在该区域的分布历史。
ABSTRACT The germinable seed bank of the colonizing weed Eupatorium odoratum was studied at the University of Ghana's Agricultural Research Station, near Kade. Five sites representing different successional stages were selected: a closed-canopy forest; intermittent-canopy forest; secondary forest; agricultural land; and a burnt forest. Twenty-five soil samples (each 500 cm3; 10×10×5 cm) were taken at random in each site, to be used for germination experiments. The secondary forest site had significantly more seeds of Eupatorium odoratum (8428 seeds per m2) than any of the other four sites. In this site Eupatorium odoratum constituted 81% of the total seed bank and had significantly more rapid germination of seeds than any other species. The results indicate that the existence of a soil seed bank may depend on: (1) time allowed for seed accumulation; (2) habitat accessibility to dispersing seeds; (3) the type of disturbance that occurs in an area; (4) dispersal capabilities of colonizing species; and (5) the history of the species′ distribution in the area.