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Carbon Flux between Sediment and Water Column of a Shallow, Subtropical, Hypereutrophic Lake
Author(s) -
Gale P. M.,
Reddy K. R.
Publication year - 1994
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1994.00472425002300050017x
Subject(s) - water column , sediment , hydrology (agriculture) , flux (metallurgy) , productivity , environmental science , subtropics , phytoplankton , total organic carbon , nutrient , oceanography , environmental chemistry , geology , chemistry , ecology , geomorphology , biology , geotechnical engineering , organic chemistry , economics , macroeconomics
Field and laboratory experiments were conducted to measure forms, storages, and flux of C in the water‐sediment colunm of a shallow, subtropical, hypereutrophic lake. High gross primary productivity in the lake (1.4 ± 0.3 kg C m −2 yr −1 ) was not significantly correlated with any water chemistry parameters measured. This suggested that the phytoplankton community was functioning at maximum levels and under nutrient nonlimiting conditions. Major C input to the lake is through gross primary productivity, of which 90% is lost through heterotrophic and microbial respiration processes within the water column. Resuspension of the bottom sediments was a major input of C into the water column, contributing 720 g C m −2 yr −1 . In comparison, diffusive flux of dissolved organic C from the sediment was minimal (1.2 g C m −2 yr −1 ), as were external inputs into the water column (20 g C m −2 yr −1 ). High productivity of this system has resulted in a net accumulation of C (as sediments) of 118 g C m −2 yr −1 .