Nitrogen accumulation and plant species replacement in three salt marsh systems in the Wadden Sea

1997 ◽  
Vol 3 (1) ◽  
pp. 19-26 ◽  
Author(s):  
H. J. van Wijnen ◽  
J. P. Bakker
Keyword(s):  
Salt Marsh ◽  
Plant Species ◽  
Wadden Sea ◽  
Nitrogen Accumulation ◽  
Species Replacement

The relation between vegetation zonation, elevation and inundation frequency in a Wadden Sea salt marsh

2002 ◽  
Vol 73 (3) ◽  
pp. 211-221 ◽  
Author(s):  
Anna-C Bockelmann ◽  
Jan P Bakker ◽  
Reimert Neuhaus ◽  
Jochim Lage
Keyword(s):  
Salt Marsh ◽  
Wadden Sea ◽  
Sea Salt ◽  
Vegetation Zonation ◽  
Inundation Frequency

Effect of Herbivory and Plant Species Replacement on Primary Production

2000 ◽  
Vol 155 (6) ◽  
pp. 735-754 ◽  
Author(s):  
Claire de Mazancourt ◽  
Michel Loreau
Keyword(s):  
Primary Production ◽  
Plant Species ◽  
Species Replacement

Effect of nitrate supply on the facilitation between two salt-marsh plants (Suaeda salsa and Scirpus planiculmis)

2020 ◽  
Vol 13 (2) ◽  
pp. 204-212
Author(s):  
Hua Ma ◽  
Li-Juan Cui ◽  
Xu Pan ◽  
Wei Li ◽  
Yu Ning ◽  
...  
Keyword(s):  
Salt Marsh ◽  
Plant Species ◽  
Salt Marshes ◽  
Interspecific Interactions ◽  
Stress Gradient ◽  
Interactive Effects ◽  
Suaeda Salsa ◽  
Environmental Drivers ◽  
Salt Marsh Plant ◽  
Nitrate Supply

Abstract Aims In estuarine salt-marshes, nitrate supply and soil salinity, which are known as two main environmental drivers, simultaneously affect the interspecific interactions between plant species. However, to date, their interactive effects on interspecific interactions have not been closely examined for salt-marsh plant species. Methods Juvenile plants of Suaeda salsa L. (Chenopodiaceae) and Scirpus planiculmis Fr. (Cyperaceae) were grown in rinsed river sand to conduct a greenhouse experiment with three treatment categories: interspecific interaction (mixed culture or monoculture), three salinity levels (1, 50 and 100 mmol L−1) and three nitrate levels (0.5, 5 and 10 mmol L−1). First, height and biomass of all plants were measured. Then, the growth data, relative interaction index and competitive important index of the two species were analyzed. Important Findings The interspecific interactions between S. salsa and S. planiculmis were facilitation across the salinity gradients. The promotion of S. salsa growth with high nitrate supply did not enhance the facilitative effect of the species, especially at low salinity. However, high nitrate supply significantly shifted the interspecific interactions of S. planiculmis from facilitation to competition at high salinity. Our results suggest that excessive nitrate application changes the prediction of the stress-gradient hypothesis along a salinity gradient, leading to collapse of the two species coexistence in the salt-marshes. These findings make a contribution to the understanding of how S. salsa and S. planiculmis, as well as salt-marsh communities, respond to the human modification of estuarine nutritional levels.

scholarly journals Physiological Diversity of the Rhizosphere Diazotroph Assemblages of Selected Salt Marsh Grasses

1998 ◽  
Vol 64 (11) ◽  
pp. 4276-4282 ◽  
Author(s):  
Christopher E. Bagwell ◽  
Yvette M. Piceno ◽  
Amy Ashburne-Lucas ◽  
Charles R. Lovell
Keyword(s):  
Salt Marsh ◽  
Plant Species ◽  
Juncus Roemerianus ◽  
Growth Forms ◽  
Physiological Diversity ◽  
Induced Stress ◽  
Geochemical Parameters ◽  
Distinct Strain ◽  
Components Analysis ◽  
Geochemical Variables

ABSTRACT Rhizosphere diazotroph assemblages of salt marsh grasses are thought to be influenced by host plant species and by a number of porewater geochemical parameters. Several geochemical variables can adversely affect plant productivity and spatial distributions, resulting in strong zonation of plant species and growth forms. This geochemically induced stress may also influence the species compositions and distributions of rhizosphere diazotroph assemblages, but little is currently known about these organisms. The diversity and key physiological features of culturable, O2-tolerant rhizosphere diazotrophs associated with the tall and short growth forms of Spartina alterniflora and with Juncus roemerianus were examined. A total of 339 gram-negative strains were isolated by a root stab culture approach and morphologically and physiologically characterized by using API and BIOLOG tests. Eighty-six distinct groups composed of physiologically similar strains were identified. Of these groups, 72% were shown to be capable of N2 fixation through molecular analyses, and a representative strain was chosen from each diazotroph group for further characterization. Cluster and principal-components analysis of BIOLOG data allowed the designation of physiologically distinct strain groupings. Most of these groups were dominated by strains that were not identifiable to species on the basis of API or BIOLOG testing. Representatives of several families including theEnterobacteriaceae, Vibrionaceae,Azotobacteraceae, Spirillaceae,Pseudomonadaceae, and Rhizobiaceae were recovered, as well as strains with no clear taxonomic affiliations. This study identifies numerous potentially important physiological groups of the salt marsh diazotroph assemblage.

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