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Productivity and Density of Soil Algae in an Agricultural System
Author(s) -
Shimmel Stephen M.,
Darley W. Marshall
Publication year - 1985
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1938006
Subject(s) - productivity , algae , biomass (ecology) , environmental science , carbon dioxide , carbon fixation , volume (thermodynamics) , zoology , botany , ecology , biology , physics , quantum mechanics , macroeconomics , economics
Soil algal productivity and biomass were monitored in a conventional tillage agricultural system from December 1981 through December 1982. Productivity was based on the fixation rate of radiolabeled carbon dioxide. Biomass estimates (cell number and volume) were based on cell counts radiolabeled carbon dioxide. Biomass estimates (cell number and volume) were based on cell counts and measurements done with epifluoroscence microscopy. Algal productivity values (measured as carbon fixation) ranged from 0 to 76 mg°m — 2 °h — 1 , values for cell number ranged from 5.85 x 10 8 to 5.19 x 10 1 0 cells/m 2 and the volume of cells was between 34.8 and 7540 mm 3 /m 2 . Regression analysis indicates that algal productivity was most closely correlated with the product of cell number and light intensity, while a number of cells per square metre was most closely correlated with the product of temperature and moisture. The logarithm of the average volume per cell was inversely correlated with soil moisture and temperature. The percentage of algae present as aggregates was proportional to moisture and the square of temperature. Total annual productivity (as carbon) was estimated to be 39 g/m 2 .