Abstract
Nitrogen fixation was studied by the acetylene-reduction technique in root nodules of 10 native Australian legumes in three habitats in Victoria: low open-forest. sandy heathland and coastal sand dunes. Nodular activity reached a maximum in spring (and in autumn in sand-dune species), declined to a minimum in late summer and continued at a low level throughout winter. Mean nitrogenase activity was 1.73 pmol C,H, reduced g-' fresh wt nodules h-I, with spring maxima 8-250 times summer minima. It is suggested that variations in rainfall and temperature were the major factors influencing seasonal variations in nodular activity. Estiniates of minimum acetylene reduction per hectare per year were derived from measurements of seasonal and diurnal variations in acetylene reduction and abundance of nodules per hectare, and were used to derive approximate minimum values for nitrogen fixation of 0.004-0.746 kg ha' yr-I. The quantities of nitrogen fixed are compared with other reports and the significance of nitrogen fixation by these native legumes is discussed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Nodular activity peaked in spring, and also autumn for sand-dune species.
Verbatim
e0“Nodular activity reached a maximum in spring (and in autumn in sand-dune species)”
t0“Native Australian Legumes”
Claim · model-written summary
Nodular activity fell to a late-summer minimum and stayed low in winter.
Verbatim
e0“declined to a minimum in late summer and continued at a low level throughout winter”
t0“Native Australian Legumes”
e1“Nodular activity reached a maximum in spring (and in autumn in sand-dune species)”
Claim · model-written summary
Mean nitrogenase activity was 1.73 pmol C,H, reduced g-' fresh wt nodules h-I.
Verbatim
e0“Mean nitrogenase activity was 1.73 pmol C,H, reduced g-' fresh wt nodules h-I”
t0“Native Australian Legumes”
Claim · model-written summary
Spring nodular activity maxima were 8-250 times summer minima.
Verbatim
e0“spring maxima 8-250 times summer minima”
t0“Native Australian Legumes”
Claim · model-written summary
Estimated minimum fixation ranged from 0.004-0.746 kg ha' yr-I.
Verbatim
e0“minimum values for nitrogen fixation of 0.004-0.746 kg ha' yr-I”
t0“Native Australian Legumes”