Potential role of propagule banks in the development of aquatic vegetation in backwaters along navigation canals
Potential role of propagule banks in the development of aquatic vegetation in backwaters along navigation canals
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DOI：
10.1016/s0304-3770(03)00078-0
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发表时间：
2003-09-01
期刊：
影响因子：
1.8
通讯作者：
ter Heerdt, GNJ
中科院分区：
文献类型：
--
作者：
Boedeltje, G;Bakker, JP;ter Heerdt, GNJ
研究了荷兰两条航道沿岸死水繁殖体库中植物物种的多样性和丰度，以评估其与常绿植被的关系，以及繁殖体库在建立（水下）水生植被中的潜在作用。在五个不同植被组成和年龄的地点，收集了180个样本：100个来自地表沉积物，80个来自原始土壤和沉积物之间的界面（=底泥）。共发现113种，其中尤以Juncus spp.和Lythrum salicaria L.最丰富。低密度时有7种沉水物种。表层沉积物中平均有10.8 ~ 17.8种l(-1)，底泥中平均有8.5 ~ 10.2种l（-1）。样品中繁殖体的平均数量从3年的少于200 l（-1）到10年的超过3000 l（-1）不等。繁殖体库与直立植被的对应关系不大。6个样地移沙后2个月植被恢复，共发现10种；然而，几乎没有水下物种。结果表明，繁殖体库在水渠沿线各种沉水植被的重建中不能发挥重要作用。然而，在沿着水线的狭窄地带，由于切割和疏浚造成了裸露的场地，繁殖体库可能有助于物种丰富的新兴植被的发展。(C) 2003 Elsevier B.V.版权所有
The diversity and abundance of plant species in propagule banks of backwaters along two navigation canals in The Netherlands were studied in order to assess the relationship with the standing vegetation and the potential role of propagule banks in the establishment of (submerged) aquatic vegetation. At five sites, varying in vegetation composition and age, 180 samples were collected: 100 from surface sediment and 80 from the interface between original soil and sediment (=subsediment). In total, 113 species emerged of which Juncus spp. and Lythrum salicaria L. were the most abundant. Seven submerged species occurred at low densities. On average, there were 10.8-17.8 species l(-1) in the surface sediment, and 8.5-10.2 l(-1) in the subsediment. The mean number of propagules in samples ranged from fewer than 200 l(-1) in 3-year-old to over 3000 l(-1) in 10-year-old sites. There was little correspondence between propagule bank and standing vegetation. Vegetation establishment 2 months after sediment removal in six plots revealed 10 species; submerged species, however, hardly occurred. It is concluded that propagule banks cannot play a significant role in the (re-)establishment of diverse submerged aquatic vegetation along these canals. After creation of bare sites as a result of cutting and dredging in narrow zones along the water line, however, propagule banks may contribute to the development of species-rich emergent vegetation. (C) 2003 Elsevier B.V. All rights reserved.