Contributions by lupines to volcanic soils.

The effects of colonization of Lupinus lepidus and L. latifolius on carbon, nitrogen, and microbial activity in volcanically disturbed soils was investigated in several studies. Examination of nitrogen fixation rates showed that both species have diurnal and seasonal fluctuations that appear to be associated with environmental factors. Nitrogen fixation rates are highest during daylight and early in the growing season, and the seasonal pattern is reflected in carbon and nitrogen levels; that is, as nitrogen fixation increases, carbon and nitrogen production increases. First year plants of both species fix similar amounts of nitrogen.


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