Detecting inundation thresholds for dryland wetland vulnerability

Dryland wetlands receive periodical floods that are of key importance for ecological resilience. The inundation regime (i.e., frequency, duration, depth, and timing of inundation), is one of the major factors that determine the suitability of local conditions for specific wetland species. During dro...

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Autores principales:	Sandi, Steven G., Saco, Patricia M., Saintilan, Neil, Wen, Li, Riccardi, Gerardo A., Willgoose, Garry, Rodriguez, Jose F.
Formato:	article artículo publishedVersion
Lenguaje:	Inglés
Publicado:	Elsevier 2020
Materias:	Dryland wetlands Inundation modelling Seasonal fractional cover Minimum inundation requirements River red gum Terrestrial vegetation invasion Macquiarie Marshes
Acceso en línea:	http://hdl.handle.net/2133/17666 http://hdl.handle.net/2133/17666
Aporte de:	Repositorio Hipermedial de la Universidad Nacional de Rosario (UNR) de Universidad Nacional de Rosario

id	I15-R121-2133-17666
record_format	dspace
institution	Universidad Nacional de Rosario
institution_str	I-15
repository_str	R-121
collection	Repositorio Hipermedial de la Universidad Nacional de Rosario (UNR)
language	Inglés
orig_language_str_mv	eng
topic	Dryland wetlands Inundation modelling Seasonal fractional cover Minimum inundation requirements River red gum Terrestrial vegetation invasion Macquiarie Marshes
spellingShingle	Dryland wetlands Inundation modelling Seasonal fractional cover Minimum inundation requirements River red gum Terrestrial vegetation invasion Macquiarie Marshes Sandi, Steven G. Saco, Patricia M. Saintilan, Neil Wen, Li Riccardi, Gerardo A. Willgoose, Garry Rodriguez, Jose F. Detecting inundation thresholds for dryland wetland vulnerability
topic_facet	Dryland wetlands Inundation modelling Seasonal fractional cover Minimum inundation requirements River red gum Terrestrial vegetation invasion Macquiarie Marshes
description	Dryland wetlands receive periodical floods that are of key importance for ecological resilience. The inundation regime (i.e., frequency, duration, depth, and timing of inundation), is one of the major factors that determine the suitability of local conditions for specific wetland species. During droughts, inundation conditions can reach a threshold after which wetland vegetation transitions to dryland vegetation. This study analyses the response of vegetation to hydrologic variability in an arid wetland in Australia over a period of 20 years (including the Millennium drought) in order to identify inundation thresholds for transitions. We use numerical modelling, field and remote sensing information to relate continuous detailed simulations of the inundation regime with the response of patches of Common reed, Water couch and River red gum, three key vegetation associations in the study site. We focus in patches that were affected by the drought and presented dryland vegetation invasion as well as reference patches that remained healthy throughout the drought. On each patch, we compare annual and inter-annual simulated inundation regimes to the minimum inundation conditions that can support the specific vegetation of the patch and we compute the percentage area of the patch that verifies minimum inundation for each year (minimum inundation index). This index is analysed in conjunction with Landsat derived information on green vegetation coverage (green Seasonal Fractional Cover) for the selected patches. We found that the minimum inundation index and inter annual frequency are able to describe the vegetation dynamics of the patches, which can be characterised by two distinct response modes that depend on a threshold value of the minimum inundation index. Inundation below the threshold noticeably leads to degraded vegetation, but the vegetation can recover quickly if this threshold is later maintained for one or two years. Values below the threshold for more extended periods (drought) result in a gradual decrease of wetland vegetation to almost complete disappearance after four years and subsequent dryland vegetation invasion.
format	article artículo publishedVersion
author	Sandi, Steven G. Saco, Patricia M. Saintilan, Neil Wen, Li Riccardi, Gerardo A. Willgoose, Garry Rodriguez, Jose F.
author_facet	Sandi, Steven G. Saco, Patricia M. Saintilan, Neil Wen, Li Riccardi, Gerardo A. Willgoose, Garry Rodriguez, Jose F.
author_sort	Sandi, Steven G.
title	Detecting inundation thresholds for dryland wetland vulnerability
title_short	Detecting inundation thresholds for dryland wetland vulnerability
title_full	Detecting inundation thresholds for dryland wetland vulnerability
title_fullStr	Detecting inundation thresholds for dryland wetland vulnerability
title_full_unstemmed	Detecting inundation thresholds for dryland wetland vulnerability
title_sort	detecting inundation thresholds for dryland wetland vulnerability
publisher	Elsevier
publishDate	2020
url	http://hdl.handle.net/2133/17666 http://hdl.handle.net/2133/17666
work_keys_str_mv	AT sandisteveng detectinginundationthresholdsfordrylandwetlandvulnerability AT sacopatriciam detectinginundationthresholdsfordrylandwetlandvulnerability AT saintilanneil detectinginundationthresholdsfordrylandwetlandvulnerability AT wenli detectinginundationthresholdsfordrylandwetlandvulnerability AT riccardigerardoa detectinginundationthresholdsfordrylandwetlandvulnerability AT willgoosegarry detectinginundationthresholdsfordrylandwetlandvulnerability AT rodriguezjosef detectinginundationthresholdsfordrylandwetlandvulnerability
bdutipo_str	Repositorios
_version_	1764820409476186113

Detecting inundation thresholds for dryland wetland vulnerability

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