A Recolonization of Mount St. Helens Mount St. Helens is an active volcano locat

Question

A Recolonization of Mount St. Helens Mount St. Helens is an active volcano located in the Cascade Range in southern Washington, USA In the morning of May 18 in 1980, the volcano experienced an earthquake which triggered a massive eruption. The eruption was the deadliest and most destructive volcanic eventin the history of the USA with magma and debris from the volcano covering vegetation, roads and building within an area of over 600km For ecologists, St Helens presented a unique opportunity to study animal and plant re-colonization of areas affected by the eruption. To expand their understanding of how the presence of lupine affects the growth of other species, ecologists working at Mountst Helens set up experimental plots where the growth of a fireweed seedling was measured when grown: 0.8 06- 05 0.4 1F one fireweed seedling was grown alone.

Explanation / Answer

The lupine is capable of enriching the soil by adding nitrogen and several other minerals to the soil. The plant has symbiotic bacteria in the roots that fix the atmospheric nitrogen and roots releases a massive amount of carboxylic acids in the soil which facilitates the uptake of phosphorus. this makes the plant thrive in nutrient poor soils also. The graph shows that the lupine facilitates the growth as well as shows that the competition between the firewood seedling is stronger than between lupine and fireweed seedling.This can be said because the lupine is known for facilitating the growth of plant along with it. so the competition is greater between two fireweed plants than lupine and fireweed.

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