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Authors Charpentier, A; Mesleard, F; Grillas, P
Author Full Name Charpentier, A; Mesleard, F; Grillas, P
Title The role of water level and salinity in the regulation of Juncus gerardi populations in former ricefields in southern France
Source JOURNAL OF VEGETATION SCIENCE
Language English
Document Type Article
Author Keywords artificial flooding; population dynamics; Rhone delta; seedling recruitment; vegetative growth; wetland
Keywords Plus SALT-MARSH; SEEDLING RECRUITMENT; ABANDONED RICEFIELDS; TYPHA-LATIFOLIA; PLANT COMMUNITY; WETLAND PLANTS; GROWTH; VEGETATION; RESPONSES; PHOTOSYNTHESIS
Abstract In the Rhone delta (southern France) Juncus gerardi is a dominant, strongly aggregating species in artificially flooded former rice fields. In order to explain this pattern, the effects of water depth, salinity and their interaction were measured on (1) seed germination and seedling development and (2) vegetative growth of J. gerardi in a controlled-environment experiment. The germination pattern of J, gerardi was affected by salinity. Low salinity (2 g/l NaCl) delayed germination while moderate salinity (12 g/l NaCl) reduced germination rate. In contrast, the germination of J. gerardi was not affected in the range of water depths tested (i.e. 0 - 10 cm). Salinity negatively affected the development of below-ground parts, shoots acid inflorescences. This negative effect of salinity on the vegetative growth of J. gerardi was amplified when combined with flooding. Flooding with fresh water (0 - 20 cm depth) did not limit biomass production during the experiment. However, a decrease in the ratio of below-ground/above-ground dry weight at deeper water depths suggests a limitation of the vegetative propagation of J. gerardi under prolonged flooding conditions. This hypothesis is supported by the negative correlation between the cover of J. gerardi and water depth found in an abandoned rice field. The limitation on seedling recruitment imposed by salinity and the depression of vegetative growth of J, gerardi due to a combination of salinity and water depth could explain the aggregate distribution of J. gerardi in former rice fields.
Author Address Stn Biol Tour Valat, F-13200 Arles, France
Reprint Address Charpentier, A (reprint author), Stn Biol Tour Valat, F-13200 Arles, France.
ResearcherID Number Charpentier, Anne/D-6340-2015
ORCID Number Charpentier, Anne/0000-0002-8588-6001
Times Cited 5
Total Times Cited Count (WoS, BCI, and CSCD) 5
Publisher OPULUS PRESS UPPSALA AB
Publisher City UPPSALA
Publisher Address BOX 25137, S 752 25 UPPSALA, SWEDEN
ISSN 1100-9233
29-Character Source Abbreviation J VEG SCI
ISO Source Abbreviation J. Veg. Sci.
Publication Date JUN
Year Published 1998
Volume 9
Issue 3
Beginning Page 361
Ending Page 370
Digital Object Identifier (DOI) 10.2307/3237100
Page Count 10
Web of Science Category Plant Sciences; Ecology; Forestry
Subject Category Plant Sciences; Environmental Sciences & Ecology; Forestry
Document Delivery Number 129NG
Unique Article Identifier WOS:000076469400007
Plants associated with this reference

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