The seed bank in a subtropical freshwater marsh: implications for wetland restoration
The seed bank in a subtropical freshwater marsh: implications for wetland restoration
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DOI：
10.1016/j.aquabot.2004.07.001
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发表时间：
2005-01-01
期刊：
影响因子：
1.8
通讯作者：
Cheng, Y
中科院分区：
文献类型：
--
作者：
Liu, GH;Zhou, J;Cheng, Y
种子库样本采集自中国南方湖南省的亚热带浅水山地沼泽湖里沼泽。核心样品分为上层和下层（各深 5 厘米），并在 4 个月的时间内在三个水位（0、5 和 10 厘米）中发芽。共有51个物种发芽，平均密度为9211+/-7188苗m(-2)。在顶部 5 cm 处，有 41 个物种和 5747 +/- 5111 个幼苗 m(-2) 发芽，而 40 个物种和 3464 +/- 3363 个幼苗 m(-2) 在 5-10 cm 处发芽。上层发芽幼苗密度明显较高，这主要是由于八个物种的差异。随着实验水深的增加，发芽苗数减少：淹没在0、5或10 cm以下的44、21和19种幼苗分别为9788+/-7157m(-2)、2050+/-2412m(-2)和1978+/-2616m(-2)。 7种物种只能在0水位下出现。苦草仅出现在 5 厘米的水中，而苦草则出现在 10 厘米的水中。在沼泽地植被调查中，记录了25种，不到种子库记录物种的一半。现存植被中前 10 位优势植物占植被丰度的 89%，但在种子库中仅占 10%。直立植被中也出现了 20 种发芽物种，占种子库总数的 56%。我们观察到的从中国湿地种子库发芽的物种数量在北半球其他地方观察到的范围内（15-113 种）。 (c) 2004 Elsevier B.V. 保留所有权利。
Seed bank samples were collected from Huli Marsh, a subtropical shallow water mountainous marsh in Hunan Province, South China. Core samples were divided into upper and lower layers (each 5 cm in depth) and allowed to germinate in three water levels (0, 5 and 10 cm) over a 4-month period. A total of 51 species germinated and the mean density was 9211 +/- 7188 seedlings m(-2). In the top 5 cm 41 species and 5747 +/- 5111 seedlings m(-2) germinated, whereas 40 species and 3464 +/- 3363 seedlings m(-2) did so from 5-10 cm. Germinated seedling density was significantly higher in the upper layer, largely due to differences in eight species. With increasing experimental water depth, less seedlings germinated: respectively, 9788 +/- 7157 m(-2), 2050 +/- 2412 m(-2) and 1978 +/- 2616 m(-2), of 44, 21 and 19 species, submerged under 0, 5 or 10 cm. Seven species could emerge only in 0 water level. Vallisneria natans occurred only in 5 cm water, whereas Ottelia alismoides occurred in 10 cm water. In the vegetation survey of the marsh, 25 species were recorded, which was less than half of the species recorded in the seed bank. The top 10 dominants in the standing vegetation, accounting for 89% of vegetation abundance, represented only 10% in the seed bank. Twenty germinated species that also occurred in the standing vegetation accounted for 56% of the total seed bank. Our observed number of species germinating from a Chinese wetland seed bank is within the range observed elsewhere in the northern hemisphere (15-113 species). (c) 2004 Elsevier B.V. All rights reserved.