Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 44, Problem 18CTQ

The extremely low precipitation of subtropical desert biomes might lead one to expect fire to be a major disturbance factor; however, fire is more common in the temperate grassland biome than in the subtropical desert biome. Why is this?

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General Patterns Found Across All Biomes Disturbance is important in determining the set of species found in an area. Naturally, broadleaf trees will replace longleaf pine trees, changing the forest from coniferous to deciduous. However, fire removes the broadleaf species, maintaining the coniferous forest. Before agriculture, the southeastern United States was dominated by longleaf pine, but now broadleaf trees are found where the great coniferous forests once grew. From this change in forest species, what do you know has happened to the frequency of fire in the southeastern United States? There are more forest fires in the southern United States now then there were in the past. There are fewer forest fires in the southern United States now then there were in the past.
Desert ecosystems are fragile for which of the following two reasons? Frequent wildfire and flooding Rapid nutrient cycling and frost damage Slow plant growth and low species diversity Overpopulation of predator species and drought Off-road vehicle traffic and deep, organic soils
Why is regular burning (thru natural fires) an important part of maintaining the health of grasslands and coniferous forests?  Identify benefits that are specific to each biome.  Also, discuss how suppressing fires could negatively affect each system.
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