Journal ArticleDOI
Effects of Organic-Rich Sediment and Below-Ground Sulfide Exposure on Submerged Macrophyte, Hydrilla verticillata
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TLDR
Significantly inhibitory effects of sulfide were observed on plant photosynthesis, root carbohydrate and nitrogen synthetic reserves, and the net photosynthetic rates, soluble carbohydrate and soluble protein contents in root were reduced by 104, 71, and 49.8%, respectively, in the 0.6 mM sulfide treatment.Abstract:
The effects of organic-rich sediment and sulfide exposure on Hydrilla verticillata were investigated. The organic richness of sediment was simulated by adding sucrose into sediments, and sulfide exposure was conducted by adding sodium sulfide to plant roots. The length, biomass and density of shoot reduced in the sucrose-amended sediments, and the largest reduction occurred in the highest 1.0% addition treatment by 84.2%, 56.7% and 92.4%, respectively. However, the 0.1% addition treatment stimulated the growth of root. The effects of below-ground sulfide exposure on the physiological activities of H. verticillata were determined by adding sulfide to the below-ground tissue. Significantly inhibitory effects of sulfide were observed on plant photosynthesis, root carbohydrate and nitrogen synthetic reserves. The net photosynthetic rates, soluble carbohydrate and soluble protein contents in root were reduced by 104%, 71.8% and 49.8%, respectively, in the 0.6 mM sulfide treatment.read more
Citations
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Journal ArticleDOI
Sulfide as a soil phytotoxin-a review
Leon P. M. Lamers,Laura L. Govers,Inge C. J. M. Janssen,J.J.M. Geurts,Marlies E.W. van der Welle,Marieke M. van Katwijk,Tjisse van der Heide,Tjisse van der Heide,Jan G. M. Roelofs,Alfons J. P. Smolders +9 more
TL;DR: Sulfide is a potent phytotoxin, profoundly affecting plant fitness and ecosystem functioning in the full range of wetland types including coastal systems, and at several levels: the ecophysiological functioning of individual plants, plant-microbe associations, and community effects including competition and facilitation interactions.
Journal ArticleDOI
Hydrilla verticillata (Hydrocharitaceae), a recent invader threatening Brazil’s freshwater environments: a review of the extent of the problem
TL;DR: A wide ecological amplitude, resistance organs, and high growth rates and dispersion ability provide Hydrilla with great potential to invade and infest a variety of habitats, often resulting in important physico-chemical and biotic effects on the environment.
Journal ArticleDOI
Propagule pressure, invasibility of freshwater ecosystems by macrophytes and their ecological impacts: a review of tropical freshwater ecosystems
TL;DR: In this article, the authors draw parallels between the principal concepts of invasion biology, developed mainly for terrestrial plants in temperate regions, with findings for macrophytes recorded in tropical inland waters.
Journal ArticleDOI
Explanatory variables associated with diversity and composition of aquatic macrophytes in a large subtropical river floodplain
TL;DR: In this paper, the authors describe the patterns of plant species diversity and com- position and vegetation height in aquatic ecosystems and their potential determinants at a regional scale in the Middle Parana River floodplain.
Journal ArticleDOI
Benthic nitrogen metabolism in a macrophyte meadow ( Vallisneria spiralis L.) under increasing sedimentary organic matter loads
Elisa Soana,Elisa Soana,Mariachiara Naldi,Stefano Bonaglia,Erica Racchetti,Giuseppe Castaldelli,Volker Brüchert,Pierluigi Viaroli,Marco Bartoli +8 more
TL;DR: In this article, rates of denitrification, dissolved inorganic N fluxes and benthic nitrogen uptake were measured in sediments vegetated by the submerged macrophyte Vallisneria spiralis L. under increasing organic matter loads.
References
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Spectrophotometric determination of hydrogen sulfide in natural waters1
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Manganese, iron and sulfur cycling in a coastal marine sediment, Aarhus bay, Denmark
TL;DR: The seasonal variation in oxidized and reduced pools of Mn, Fe and S, as well as the rates of SO42− reduction, were studied in a fine-grained sediment as mentioned in this paper.
Journal ArticleDOI
The potential role of plant oxygen and sulphide dynamics in die‐off events of the tropical seagrass, Thalassia testudinum
Jens Borum,Ole Pedersen,T. M. Greve,Thomas A. Frankovich,Thomas A. Frankovich,Joseph C. Zieman,Joseph C. Zieman,James W. Fourqurean,James W. Fourqurean,C. J. Madden,C. J. Madden +10 more
TL;DR: The hypothesis that internal oxygen stress, caused by low water column oxygen content or poor plant performance governed by other environmental factors, allows invasion of sulphide is supported and that the internal plant oxygen and sulphide dynamics potentially are key factors in the episodes of sudden die-off in beds of Thalassia testudinum is supported.
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