TY - JOUR
AU - Morris, James T.
AB - Rates of nitrogen uptake were measured in cultures of Spartina alterniflora growing outdoors in continuously flowing nutrient solutions. A Michaelis—Menten model with Vmax expressed as an exponential function of temperature was an accurate predictor of uptake rates during the growing season. Half—saturation constants were estimated to be 0.057 @+ 0.016 mg N/L for NH4 and 0.124 @+ 0.034 mg N/L for NO3. These half—saturation constants are too low in comparison to levels of inorganic NH4 in marsh pore water to account for nitrogen—limited growth in the field. It was suggested that an edaphic factors(s), possibly an oxygen deficiency, or a metabolic poison such as H2S, or competition from other ions for carriers, might inhibit nitrogen uptake in the marsh in such a way as to increase the half—saturation constant for uptake. A gradient of such an environmental factor could account for gradients in morphology and productivity in communities of Spartina alterniflora.
TI - The Nitrogen Uptake Kinetics of Spartina Alterniflora in Culture
JF - Ecology
DO - 10.2307/1936831
DA - 1980-10-01
UR - https://www.deepdyve.com/lp/wiley/the-nitrogen-uptake-kinetics-of-spartina-alterniflora-in-culture-D0trIIwrdz
SP - 1114
EP - 1121
VL - 61
IS - 5
DP - DeepDyve
ER -