The desert ecosystem is one of the world's most important ecosystems. The desert ecosystem covers around 17% of the earth's surface. Deserts can be found on almost every continent. Desert ecosystems thrive in locations with relatively little annual rainfall and extreme heat or cold. The desert ecosystem's initial productivity is quite poor. Each year, the desert receives less than 50 cm of rain. It is a big barren abandoned and dry sand-covered region. Deserts are of two types namely: Hot Deserts and Cold Deserts. This article will explain to you about Desert Ecosystem which will be helpful in preparing the Environment syllabus for the UPSC Civil service exam.

What exactly is a Desert Ecosystem?

• The interactions between species, the environment in which they exist, and any other non-living influences on the habitat characterize a desert ecosystem.
• As it's the world's driest terrestrial habitat, it has less biodiversity.
• Plants in this desert environment have a short lifespan in nature. They grow, germinate, and perish in a matter of days.
• Because their stems are green, succulent, and covered with a waxy material, desert plants can photosynthesize.
• The lack of rain in the mid-latitudes is frequently attributed to stable high-pressure zones; in temperate regions, deserts often exist in "rain shadows," or areas where towering mountains block rainfall from the seas.

Desert Ecosystem - Six Biogeographic Domains

The Australian Deserts

• The Australian deserts are a collection of extremely dry eco-regions in Australia's interior.
• They are sparsely populated, with a population density of less than one person per square kilometer on average.
• Australian deserts have the lowest human population of any desert on the planet.

The Afrotropic Deserts

• These desert biomes are found throughout Sub-Saharan Africa.
• It also includes the Arabian Peninsula's southern reaches.
• Humans exert significant strain on the ecosystem, particularly in Madagascar and the Horn of Africa.

The Indo-Malay Region

• The Indus Valley and the Thar are two hot lowlands that make up the Indo-Malay area.
• In terms of human imprint, these deserts rank first in the globe.
• It is also referred to as the Oriental realm.

The Neotropic Deserts

• South America, Central America, the Caribbean islands, and southern North America are all part of this area.
• Those in South America occupy approximately 684 million square miles.
• Only 6% of the overall land is protected, though.

The Nearctic Deserts

• In North America, these deserts cover an estimated 1.04 million square miles.
• Phoenix's average population is relatively high due to the expansion of urban companies in the United States.

The Palearctic Domain

• This domain contains the world's largest collection of desserts, spanning 9.9 million square miles.
• That's around 63 percent of all deserts on the planet.
• The extreme dryness and inaccessibility of these deserts have made them famous.
• The Sahara desert in Africa occupies around 9.9 square miles, or nearly 10% of the African continent.
• The deserts in the Central region, on the other hand, are marked by folded mountains, significant landscape variety, and enclosed basins.

Desert Ecosystem - Types

Hot desert/ Thar desert

• With an area of 8.54 million square kilometers, the Sahara is regarded as the world's largest desert.
• It is both the world's largest and hottest desert.
• The Sahara desert is 1,000 meters above sea level and located in tropical regions.
• It includes Algeria, Tunisia, Egypt, Mali, Chad, Niger, Western Sahara, Sudan, Mauritania, Libya, and Morocco, as well as a large portion of North Africa.
• The whole area is roughly 8,600,000 square kilometers, which is around 4,800 kilometers east to west and between 800 and 1,200 kilometers north to south.
• This region's climate is extremely hot, and dry, and receives only a little amount of precipitation throughout the year.
• The days are scorching in this arid desert. Temperatures will reach 45° C to 50° C during the day, heating the exposed rocks and sand.
• The nights can be bitterly cold, with temperatures occasionally dropping below 0° C.

Cold Desert/ Temperate Desert

• Ladakh is known for being India's cold desert.
• It can be found at high altitudes in temperate regions such as the Great Himalayas in eastern Jammu and Kashmir and the western Himalayas in Himachal Pradesh in North India.
• Ladakh's elevation varies from 3,000 meters near Kargil to 8,000 meters in the Karakoram.
• The climate is exceptionally chilly and dry due to its high altitude.
• Summer temperatures are barely above 0° C during the day and below –30° C at night.
• The Gangotri glacier, as well as several other glaciers and rivers that run through Ladakh, can be found here.

Desert Ecosystem - Climate

• Desert nights are often cold due to the lack of moisture in the air to collect and store the heat generated by the high temperatures during the day.
• The desert biome is a hard geographic mass to live in because of high-temperature changes and extremely low water levels.
• Since there is little moisture in the atmosphere to screen off the sun's rays, temperatures are so severe throughout the day.
• This indicates that the sun's energy is absorbed by the ground.
• The surrounding air is then heated by the earth's surface. The reverse occurs when the sunsets.
• The heat collected during the day is radiated back to the atmosphere by the heated ground and hot air, resulting in a quick drop in temperature.
• Temperatures might drop below 0 degrees Celsius at night.

Desert Ecosystem - Precipitation

• Precipitation in hot, dry deserts differs significantly from precipitation in cold deserts.
• The average amount of rainfall in hot and cold deserts is 15 centimeters per year.
• In contrast, cold deserts get a lot of snow and get a lot of rain in the spring, about 15-26 cm on average.

Desert Ecosystem - Seasons

• Desert ecosystems have a wide range of seasonal climates.
• Temperatures in the summer range from 30 to 49 degrees Celsius. In the summer, there is little to no precipitation.
• In addition, evaporation usually outpaces precipitation.
• Temperatures in the winter range from 10 to 20 degrees Celsius.
• During the summer, there is a lot of precipitation.

Desert Ecosystem - Soil

• In all ecosystems, the type of soil determines the nature of the vegetation in that region.
• Plants grow in different soil types. Desert soils lack organic matter such as nitrogen, phosphorus, and other nutrients necessary for plant growth.
• The soil in the desert habitat is dry, rocky, and sandy.
• Because the soil is unsuitable for plant growth, there are no large trees.

Desert Ecosystem - Flora

• Desert ecosystems get very little rainfall and have high daily temperature swings, making life difficult for plants.
• Despite these obstacles, a diverse diversity of plants thrive in this habitat.
• Cacti, tiny shrubs, succulents, and grasses are among the most frequent plants that flourish in desert biomes.
• Brittle Bush, Desert Ironwood, Chain Fruit Cholla, Joshua Tree, Palo Verde, Jumping Cholla, Ocotillo, Pancake Prickly Pear Cactus, Soaptree Yucca, and Mojave Aster are examples of desert flora.

Desert Ecosystem - Fauna

• Rabbits and wild cats are examples of desert animals.
• Mountain lions and bobcats are two of the most common desert wild animals.
• Snakes such as rattlesnakes, coral snakes, and king snakes can be found in many desert ecosystems.
• Lizards such as horned lizards, banded geckos, and tree lizards are also common in the desert.
• Only ants and beetles are eaten by horned lizards, which have spines and horns.
• The roadrunner, vulture, and golden eagle are all common desert birds.
• Coyotes, Javelina, Desert Tortoise, Cactus Wren, Desert Kangaroo Rat, Sonoran Desert Toad, Thorny Devil, Desert Bighorn Ship, Armadillo Lizard, Sonoran Pronghorn Antelope, and other creatures inhabit the desert ecosystem.

Desert Ecosystem - Adaptations

Adaptations in Plants

• Desert plants have evolved unique adaptations to survive in these harsh environmental circumstances.
• Water storage in stems and leaves, waxy coats on leaves, and leaf shedding are all common responses to reduce water loss.
• To reach water tables, certain plants have developed long taproots.
• Others will go dormant till the rains come again.
• The cactus plant, for example, has adapted effectively to the extreme climatic conditions of desert biomes, growing up to 20 feet tall and living for more than 200 years.
• Another plant that thrives in desert environments is the Mugma Tree.
• It is made up of little leaves that grow upwards, acting as a funnel when it rains.
• Rainwater is directed to the tree's base by funnel-like leaves, where it is absorbed by shallow roots.
• In general, this adaptation ensures that the tree receives plenty of water when it rains.

Adaptations in Animals

• Despite the extreme environmental circumstances, numerous animals exist in the desert habitat.
• These creatures have evolved special adaptations to remain cool and conserve water.
• Due to the water stored in its hump, a typical desert animal like the Camel may last days without food and drink.
• It also includes thick fur and underwool to keep it warm throughout the coldest months.
• It can seal its nostrils to block sand from blowing in.
• Camels have two rows of eyelashes to protect their eyes from the sun and wind, as well as large hooves to keep them from sinking in the sand.
• Foxes are able to live here because of their burrowing and nocturnal habits.
• This burrowing allows them to avoid the scorching heat of the day. They also have huge ears, which help to dissipate excess body heat on hot days.
• Their thick, sandy fur protects them from the desert's frigid evenings. It also serves as a heat reflector and concealment.
• Desert animals have developed adaptations including panting to reduce heat, seasonal migration, and long periods of dormancy that endure until triggered by moisture and temperature conditions.

Desert Ecosystem - Importance

• This ecosystem supports a diverse range of plant and animal species.
• These animals and plants maintain balance by establishing relations with one another.
• The sand of the desert habitat is home to a variety of bacteria.
• These bacteria have the ability to store carbon dioxide. It also serves as a carbon sink, preventing CO2 from entering the atmosphere.
• Mineral resources, such as natural gas, are frequently found in these environments.
• It contains a variety of landforms and oasis thereby drawing the attention of tourists and boosting the tourism industry.

Conclusion

Desert ecosystems, like other ecosystems, play an important role in the globe. Despite the minimal rainfall and dry environment, this ecosystem is critical to preserving the earth's balance. Desert ecosystems are currently experiencing numerous issues as a result of climate change. One of the major challenges is global warming, which has the most obvious effects on hot deserts. Many plants and animals in the desert ecosystem are confronting issues relating to food and survival as a result of rising temperatures.