Research About lupine

Posted On: Filed Under: Biological Research

Demography of Lupinus lepidus on the pumice plain and its role in primary and secondary succession.

This study details the demography of two populations of Lupinus lepidus, a primary successional plant species growing on the Pumice Plain, and also investigates the role lupine plays in the recruitment of additional species through facilitation. Lupine and other plant species’ populations have been censused once or twice each growing season from 1982-1991. Prairie lupine was the first species to colonize the barren deposits of the Pumice Plain and attained extremely high densities in certain portions of our plots during the census years.


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Posted On: Filed Under: Biological Research

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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The evolutionary ecology of Lupinus lepidus

A four year study of the evolutionary consequences of colonization was begun in 1990. The objectives of this study are to document the pattern of genetic variation in a colonizing plant species, Lupinus lepidus, and investigate the ecological processes which are expected to affect that pattern.


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Disturbance and recovery of soil, microbial, and plant processes.

Our work has focused on disturbance and recovery of soil, microbial, and plant processes following volcanic disturbance. Particular emphasis was placed on spatial relationships involving the carbon and nitrogen cycles. Comparative studies have been conducted at six sites that were disturbed to varying degrees by the May 1980 eruption of Mount St. Helens. These sites include Butte Camp, Upper Pine Creek, the Lahar on the Muddy River, the former Timberline parking Area, and Meta Lake.


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