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Deserts

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by

Urvi Kachroo

on 18 April 2013

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Transcript of Deserts

DESERTS Deserts cover about one fifth of the Earth's surface. This biome doesn't look like a very diverse Eco system, but through our research we have found out it actually is! In this presentation we are gong to teach you about the four main types of desert and about their climate, location, animals, vegetation, soil, temperature and threats. The Four Major Types Of Deserts Hot and Dry Coastal Semiraid Cold The seasons are quite warm around the year. Summers are really hot and winters bring a little rainfall. CLIMATE These deserts receive
a little more than twice the solar radiation received by humid regions, and loose around twice as much heat at night. The average annual
temperatures range
from 20 - 25*C Extreme temperatures
range from 43.5 - 49*C Maximum cold temperatures are around 18*C Rainfall is very low and/or concentrated in short burst during dry and rainless periods Temperatures Seasons Rainfall Sometimes rain starts falling and evaporates before touching the ground. Some of the driest deserts receive less than 1.5 cm of water a year. Atacama Desert of Chile Inland Sahara SOILS Soils in these kinds of deserts are course-textured, shallow, rocky or gravely with good drainage and have no subsurface water. They are coarse because there is less chemical weathering. >> The finer dust and sand particles are blown elsewhere, leaving heavier pieces behind. VEGETATION Plants in these deserts are mainly ground-hugging shrubs and short woody trees. These are leaves that are fully supported with nutrients with water conserving characteristics. they tend to be small, short and are covered with a thick cuticle (outer layer). Cacti have much-reduced leaves, (spines), meaning the photosynthesis "happens" on the stem instead of on the leaves. Some plants open their stomata (microscopic openings in the leaves that allow gas exchange) only at night when evaporation rates are lowest. REPLETE LEAVES So how does a plant life survive in this harsh environment? Some plants in hot & dry deserts include Yuccas Ocotillo Turpentine Bush Prickly Pears Sotol Ephedras Agaves Brittlebush Locations ANIMALS Most of the animals include small
nocturnal carnivores. The dominant animals are burrowers and kangaroo rats. Other animals include... Rattlesnakes Scorpions Jackrabbits Lizards Tarantulas Vultures How do these animals survive in such a harsh
environment? Ways animals adapt in hot & dry deserts: - They simply stay out of the sun. They come out to forage at dusk, dawn or night, when the desert is cooler.

- Since water is so scarce, they get their water from food they eat.

- they all have their own ways to not loose a lot of water, (burrowers live in damp burrows, which decreases the rate of water lose). FOOD CHAINS/WEBS BIOACCUMULATION 1) Winds blow from cities and dumps which then carry with them dangerous chemicals

2) The chemicals are blown else where, and the cycle repeats, breaking down the chemicals into smaller bits (chemical weathering)

3) The chemicals kill plant life, therefore killing the first consumers, and so on. This disturbs the entire eco system. Chemicals = As, Cd, Cu, Pb, Zn Arsenic Cadmium Copper Lead Zinc SOURCES websites http://www.marietta.edu/biol/biomes/desert.htm http://www.ucmp.berkeley.edu/glossary/gloss5/biome/deserts.html HUMAN IMPACTS ON
THE ENVIRONMENT By: Gurmehak & Urvi
78 Arid Environment Lack of water prevents the desert from supporting much plant and animals life. Desertification This is when once usable land becomes "none usable" >> when it loses its ability to create life. Desertification is growing due to the misuse of land resources, such as over-farming and over-grazing. Human Activity Digging for fossil fuels
Introduction of invasive species
Global warming
Mismanagement of available water INVASIVE SPECIES Help Preserve! Doing a little can help save this diverse eco system.
- Turning off devices you don't need
- Wasting less water
- Walking, or riding a bike
- Carpooling
- Leaving any animal you find in its natural habitat Here's a quote... "Deserts are among the harshest habitats on Earth. And while it may seem hospitable to nothing, look a little closer: the desert is teeming with life. The hardiest and most adaptable of species are often found in desert habitats, but even they need protection from threats such as drought and invasive species." A few examples are... Buffelgrass Argentine Cactus Moth Tamarisk Athel Tree Red Imported Fire Ant Fountaingrass Thank You For Watching
This Presentation :D Books Desert (Biomes of The World)
By: Edward. R. Ricciuti Journal Articles Desert Biome
By: David Ward http://www.sciencedaily.com/articles/d/desert.htm Deserts (Biomes of Nature)
By: Peter Murray Desert Biomes
By: Chris R. W. http://www.worldbiomes.com/biomes_desert.htm http://biology.about.com/od/landbiomes/a/aa041406a.htm http://en.wikipedia.org/wiki/Desert http://ngm.nationalgeographic.com/ngm/0308/feature3/
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