| DOI: | 10.1093/aob/mcz133
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| 论文题名: | Seeds of change: characterizing the soil seed bank of a migrating salt marsh |
| 作者: | Kottler E.J.; Gedan K.
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| 刊名: | Annals of botany
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| ISSN: | 10958290
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| 出版年: | 2020
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| 卷: | 125, 期:2 | | 语种: | 英语
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| 英文关键词: | ecotone
; germination
; high marsh
; maritime forest
; plant community ecology
; saltwater intrusion
; Sea level rise
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| 英文摘要: | BACKGROUND AND AIMS: The capacity for dispersal to promote or hinder species' responses to global change remains a major question in ecology. One ecosystem experiencing rapid change is the tidal marsh, which is migrating inland in response to accelerated sea level rise. Few studies to date have investigated the ecological dynamics that impact this large-scale migration. Seed dispersal and persistence in the soil seed bank is a component that can be strongly indicative of community trajectories. With this in mind, the aim of our study was to characterize the germinable seed bank across a marsh-forest ecotone in the Chesapeake Bay. METHODS: Soil samples were collected across transects that ran from the high marsh to the coastal loblolly pine forest in a brackish marsh in Blackwater National Wildlife Refuge, MD, USA. Samples were grown in a greenhouse and watered with either freshwater or 3 ppt seawater solution. We compared community composition across transects and between salinity treatments. Additionally, we compared the seed bank with standing vegetation and used seed trait data from the TRY Database to investigate changes in functional traits along this ecotone. KEY RESULTS: We found halophytic species dispersing up to 15 m into the forest and a general lack of obligate upland species, including near absence of Pinus taeda, the dominant species in the forest canopy. A majority of species detected in the seed bank were wetland species of various types, with species with wide salinity tolerance arising most frequently. Salinity addition had a significant negative influence on seed bank diversity. CONCLUSION: Overall, our seed bank results suggest that dispersal and germination under the conditions of saltwater intrusion will limit forest regeneration and favour marsh plant dispersal. This indicates that the ecological processes that determine the soil seed bank community will support continued migration of marsh species into uplands. © The Author(s) 2019. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/159376
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| Appears in Collections: | 气候变化与战略
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作者单位: | George Washington University, NW, DCWA, United States
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| Recommended Citation: | |
Kottler E.J.,Gedan K.. Seeds of change: characterizing the soil seed bank of a migrating salt marsh[J]. Annals of botany,2020-01-01,125(2)
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