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Seasonal patterns of growth, tissue acid fluctuations, and 14CO2 uptake in the crassulacean acid metabolism epiphyte Tjllandsia usneoides L. (Spanish moss) by Craig E. Martin; Norman L. Christensen; Boyd R. Strain is a Environmental Science article available to read on EtoBox.

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Seasonal patterns of growth, 14CO2 uptake, and fluctuations in tissue titratable acidity were studied over the course of a year at a study site in the coastal plain of North Carolina. Elongation rates of Spanish moss strands were maximal in the summer and minimal in the winter. Summer maximal biomass addition rates were calculated to be 3.4 rag. month-1. Mortality of the strands was greatest in the winter months. Rates of 14CO2 uptake and fluctuations in tissue acidity were greatest in the summer over a fairly broad spectrum of environmental conditions (day and night temperatures, irradiance, length of drought). Maximal 14COz uptake rates (1.2 mg CO2.mg Ch1-1 .h -1) were measured in May 1978. Rates of 14CO2 uptake and fluctuations in titratable acidity were inhibited below 5 ~ C and eliminated at 0 ~ C air temperatures. Isothermal diurnal conditions resulted in low rates of ~4CO2 uptake. Tissue water content did not appear to be a major factor controlling ~CO2 uptake rates. However, tissue wetting by rain severely reduced nighttime uptake yet stimulated low rates of daytime x4CO2 uptake. This was the only condition in which daytime 14CO2 uptake occurred, excluding the early morning

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Author

Craig E. Martin; Norman L. Christensen; Boyd R. Strain

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0029-8549)

Published

1981

Language

EN

Field

Environmental Science (Physical Sciences)