Interactive Effects of Environmental Conditions on the Growth of Submersed Aquatic Macrophytes

Autor:	D. G. McFarland, John W. Barko, R M Smart
Rok vydání:	1991
Předmět:	Biomass (ecology) Total inorganic carbon Agronomy biology Vallisneria Shoot Hydrilla Sediment Aquatic Science biology.organism_classification Vallisneria americana Ecology Evolution Behavior and Systematics Macrophyte
Zdroj:	Journal of Freshwater Ecology. 6:199-207
ISSN:	2156-6941 0270-5060
DOI:	10.1080/02705060.1991.9665294
Popis:	Variations in the growth of dioecious Hydrilla verticillata (L.f.) Royle and Vallisneria americana Michx. were examined in a greenhouse under each of two levels (low and high) of light availability, sediment fertility, and inorganic carbon supply. Under low light (ca. 125 uE/m2/s at midday), effects of sediment fertility and inorganic carbon availability on biomass production were relatively minor. Maximum biomass production in both species was achieved under high light (ca. 550 uE/m2/s at midday) on fertile sediment with a ten-fold increase in ambient CO2, supply. However, with other treatment combinations, biomass and morphological responses differed considerably between species. Biomass production in Hydrilla was most responsive to CO2 supply, while in Vallisneria, production was most responsive to sediment fertility. Shoot elongation in response to low light was much more pronounced in Hydrilla than in Vallisneria. Under high light, Hydrilla maximized shoot density (number) with an accompanyi...
Databáze:	OpenAIRE
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