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ACETYLENE REDUCTION BY BLUE‐GREEN ALGAE IN SUB‐TROPICAL GRASSLAND
Author(s) -
JONES KEITH
Publication year - 1977
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1977.tb04847.x
Subject(s) - nitrogen fixation , algae , morning , blue green algae , photosynthesis , grassland , botany , overcast , zoology , nitrogen , daylight , environmental science , chemistry , biology , horticulture , agronomy , cyanobacteria , meteorology , geography , genetics , physics , organic chemistry , optics , sky , bacteria
SUMMARY In situ measurements using the acetylene reduction technique showed that mats of blue‐green algae found amongst kikuyu grass fixed nitrogen throughout the day and night. Daylight fixation increased throughout the morning, fell during the hottest part of the day, and reached a peak (19.2 mg C 2 H 4 m −2 h −1 ) during the afternoon. Nitrogen fixation was higher on overcast days than on hot sunny days. Nocturnal fixation was also due to blue‐green algae and was sensitive to temperature changes.