The seed bank in an old-growth, temperate deciduous forest
The seed bank in an old-growth, temperate deciduous forest
复制标题
古老温带落叶林中的种子库
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
M. Lechowicz
中科院分区：
文献类型：
--
作者：
Sara Leckie;M. Vellend;G. Bell;M. J. Waterway;M. Lechowicz
我们评估的大小和组成的种子库在31个地块内的一个古老的生长，温带落叶林在蒙特圣伊莱尔，魁北克，加拿大的栖息地范围。结果表明，种子库中共有49种，平均40种·m-2，种子密度中位数为1218粒·m-2。最常见的种子是苔草和悬钩子，Diervilla lonicera和Eupatorium rugosum的物种，而苔草的种子数量最多。在12个种的种子库中，有11个种生长在10km2森林片断周围的发达景观中。这些非森林物种的数量只是森林种子库的一小部分。种子库里没有春药，树种也不多。不同生境种子库丰富度的变化与林冠覆盖度、土壤水分和土壤养分呈正相关，而与地上植被种子库密度和物种总数无相关性。种子库密度随土壤含水量的增加而增加。土壤较肥沃、枯枝落叶层较深、郁闭度较高的样地种子库中木本植物占优势。草本植物占主导地位的种子库的地块更开放的树冠，更mesic水制度，更大的物种丰富度在地上植被。与早期的研究结果相反，森林种子库主要包括与冠层干扰或次生演替相关的不耐荫物种，这种古老的原始森林的种子库包含许多耐荫的森林物种。
We assessed the size and composition of the seed bank in 31 plots representing a range of habitats within an old-growth, temperate deciduous forest at Mont St. Hilaire, Quebec, Canada. We identified 49 taxa in the seed bank, with an average of 40 species·m -2 and a median density of 1218 seeds·m -2 . The most frequent seeds were species of Carex and Rubus, Diervilla lonicera, and Eupatorium rugosum, while seeds of Carex were the most numerous overall. Of the 12 species in the seed bank not found in the forest, 11 were found growing on the developed landscape sur- rounding this 10-km 2 forest fragment. These nonforest species were numerically only a minor component of the forest seed bank. Vernal herbs were not in the seed bank, and there were only a few tree species. Variation in seed bank rich- ness among habitats was correlated positively with canopy cover, soil moisture, and soil nutrients, but not with the seed bank density or total number of species in the aboveground vegetation. Seed bank density increased with plot soil moisture. Woody species predominated in the seed bank of plots with richer soils, deeper litter, and more closed cano- pies. Herbaceous species predominated in the seed bank of plots with more open canopies, more mesic water regimes, and greater species richness in the aboveground vegetation. Contrary to earlier results suggesting forest seed banks pri - marily include shade-intolerant species associated with canopy disturbance or secondary succession, the seed bank in this old-growth, primary forest contains many shade-tolerant forest species.