An ecosystem is a geographical area in which plants, animals, and other species, as well as weather and topography, interact to generate a living bubble. A terrestrial ecosystem is a land-based community of species that includes biotic and abiotic interactions in a specific area. Tundra, taigas, temperate deciduous forests, tropical rainforests, grasslands, and deserts are examples of terrestrial ecosystems. This article will explain to you about the Terrestrial Ecosystem which will be helpful in preparing the Environment syllabus for the UPSC Civil service exam.

Terrestrial Ecosystems - Concept

• A terrestrial ecosystem is a land-based population of species that includes biotic and abiotic interactions in a specific area.
• Terrestrial ecosystems cover roughly 140 to 150 million km2 or about 25 to 30 percent of the total land area on the planet.
• The decreased availability of water in terrestrial ecosystems, as well as the role of water as a limiting factor, distinguishes them from aquatic ecosystems.
• Since the atmosphere is more transparent than water, light is more readily available in terrestrial environments than in aquatic ecosystems.
• Terrestrial ecosystems have more gas availability than aquatic environments.
• Terrestrial ecosystems are further divided into the following.

Forests

• Different types of forests like Temperate deciduous forests, plantation forests, and tropical rainforests are all examples of these ecosystems.
• They provide a natural environment for a wide range of living organisms and have the greatest diversity of species.
• Forests occupy roughly 30 to 35 million square kilometers of the planet's surface, and they are home to over 300 million plant and animal species.
• They are classified into the following categories based on climate and tree type:
• Tropical rain forests
• Temperate deciduous forests
• Boreal or north coniferous forests

Tropical Rain Forests

• Distribution: These can be found on either side of the equator in locations with a lot of rain.
• Such forests can be found along India's western coast, as well as in regions of Southeast Asia, Africa, and South America.
• Abiotic Components: The biotic and abiotic components of an ecosystem describe the ecosystem's structure, biological relationships, distribution, and environmental properties.
• The biotic components of an ecosystem are the living components. Plants, animals, fungi, and bacteria are examples of biotic factors.
• Biotic Components: The biotic components in Tropical Rain Forests feature diverse biodiversity.
• Over 300 types of trees can be found in the Brazilian tropical rain forests, which cover an area of 200 square kilometers.
• Trees can reach a height of 50 to 60 meters. Epiphytes such as vines, creepers, woody creepers, and orchids thrive in these woodlands.
• Tree-dwelling heterotrophs such as monkeys, flying squirrels, snails, centipedes, and millipedes, as well as many insect species, abound in these forests.
• The abiotic components of an ecosystem are the non-living components. The abiotic components of an ecosystem are air, light, soil, nutrients, temperature, and rainfall.
• Tropical rainforests are found in locations with high temperatures and humidity, as well as areas with more than 200 cm of annual rainfall. Humus is abundant in the soil.

Temperate Deciduous Forests

• Distribution: They're usually found in the northwest, central, and eastern Europe, eastern North America, north China, Korea, Japan, and far eastern Russia, as well as Australia.
• In the autumn, deciduous forest trees shed their leaves, and new foliage emerges in the spring.
• Abiotic Components: These forests grow in locations with moderate climatic conditions, such as temperatures ranging from 10 to 20 degrees Celsius, a six-month winter, and annual rainfall of 75 to 150 centimeters.
• They have brown soils that are nutrient-dense.
• Producers And Consumers: Common trees include oak, beech, heath, chestnut, birch, and pine. These forests are also stratified, with a sapling, shrub, and tall herb understorey.
• Deer, bison, and rats are among the most prominent herbivores. In these woodlands, rodents perform a critical function. Seeds, fruits, and tree leaves are their primary sources of nutrition.
• Omnivores such as black bears, raccoons, wild cats, wolves, foxes, and skunks can be found in these woodlands.
• Hibernation, or winter sleep, is a frequent trait of animals found in these woodlands during the winter.
• Green flies, aphids, some moths, and butterflies are among the invertebrate fauna.

Boreal or North Coniferous Forests

• Distribution: Coniferous forests are also referred to as 'Taiga.'
• Below the northern tundra, they form a continuous strip throughout North America and North Eurasia.
• As there is no land at this latitude, there is no match to these forests in the southern hemisphere.
• Abiotic Components: The climate is chilly, with a long, hard winter and an average annual temperature below 0 degrees Celsius.
• The soils are acidic and nutrient-depleted.
• Producers: Coniferous forests are evergreen, drought-resistant, and woody in nature.
• Conifers (gymnosperms) are trees that bear naked seeds in cones, such as spruce, fir, and pine.
• Consumers: Red squirrels, deer, goats, mules, moose, and other species can be found in these forests.
• Timberwolves, lynxes, and bears are carnivores that eat them.
• Crossbills, thrushes, warblers, flycatchers, robins, sparrows, and other common birds are also found here.

Grasslands

• Distribution: Grasslands are grassy landscapes that are dominated by grasses. They are the most common type of vegetation. They occupy roughly 20% of the land on the planet's surface.
• Abiotic Components: Grasslands can be found in both tropical and temperate climates if rainfall is insufficient to support tree development. In different parts of the world, it is known by various names.
• Grasslands can be found in locations where the seasons are well defined, such as hot and dry, and warm and rainy.
• Savannas are the common name for tropical grasslands. Eastern Africa, South America, Australia, and India are all home to them.
• Savannas are a diverse environment of grasslands with scattered medium-sized trees.
• Producers And Consumers: Grasses dominate the tropical grasslands, with drought-resistant prickly trees strewn about.
• The dairy and leather industries rely on badgers, foxes, ass, zebras, and antelope feeding on grasslands.
• Rodents, reptiles, and insects all have huge populations in grasslands.
• Grasslands can also be divided into the following categories:
• Tropical Grasslands
• Temperate Grasslands

Tundra

• The name tundra comes from the Finnish word 'tunturi,' which means "treeless plain."
• Abiotic Factors: Tundra refers to arctic regions that are windy, snow-covered, and devoid of trees, and are characterized by extreme environmental conditions similar to deserts.
• Unlike deserts, this environment is totally covered in frozen soil all year, and the snow melts in the summer, resulting in shallow ponds.
• The tundra biome can be found in the north, between the Arctic Ocean and the polar ice caps, and in the south, between the coniferous woods.
• The climate of this region is marked by a long winter followed by a brief summer (2months only).
• Snow is always present on the ground. Only during the summer is the frozen substratum conducive for plant growth.
• Producers And Consumers: Lichens and a few plants with small, colorful flowers emerge as a result of this.

Desert

• Distribution: Deserts are dry, scorching, and low-rain places with high wind speeds and a scarcity of water.
• They depict temperature extremes. Deserts cover around one-seventh of the earth's surface.

• Producers And Consumers: Common desert plants include cacti, acacia, euphorbia, and prickly pears.
• Shrews, foxes, woodrats, rabbits, camels, and goats are some of the most prevalent desert herbivores and carnivores.
• Reptiles and burrowing rodent insects are two other notable consumers.
• Adaptations: Desert plants have adapted to the hot and dry conditions.
• These plants conserve water by employing the following techniques:
• They are primarily shrubs.
• Leaves are missing or have shrunk in size.
• Succulent and water-storing leaves and stems.
• Some plants have chlorophyll in their stems for photosynthesis.
• A well-developed root system that covers a broad region.
• The animals have adapted to the desert environment physically and behaviorally as follows.
• They're quick runners.
• They prefer to be nocturnal in order to avoid the heat of the sun throughout the day.
• By excreting concentrated urine, they save water.
• Long legs are common in animals and birds to keep the body away from the heated earth.
• Lizards largely eat insects and can go for several days without drinking water.
• Herbivorous creatures obtain enough water from the seeds they consume.
• Camel is nicknamed the desert ship because it can travel large distances for several days without drinking water.
• Deserts are divided into two types based on climate and temperature: hot deserts and cold deserts.
• The Sahara Desert is an example of a hot desert, with high temperatures, limited rainfall, and complicated life for both plants and animals.
• Ladakh, a chilly desert on the eastern side of Jammu and Kashmir near the Great Himalayas, is an example.

Sustainable Management of Terrestrial Ecosystem

• From raw materials to food production, terrestrial ecosystems underpin the majority of our development.
• Forests cover 30% of the Earth's surface, provide oxygen and refuge for many land species, and are a significant carbon sink.
• The yearly loss of forested land was less than half of what it was in 1990 between 2010 and 2015, but 12 million hectares of forest are lost every year, and biodiversity continues to diminish at alarming rates.
• With today's technologies, an increasing human population will necessitate more cultivated fields, but this should not be done at the price of forested areas, especially with climate change intensifying desertification.
• Forest ecosystems are essential for the conservation of water resources, as well as numerous new medications and unknown active components.

Conclusion

Terrestrial ecosystems are the most important ecosystems on the planet, comprising all land-based life. The human population is primarily reliant on the terrestrial ecosystem and the resources that are available on the ground. The parameters of these units will be affected by man's impact on these ecosystems. Maintaining the terrestrial environment is indispensable for our long-term survival.

FAQs

Q1: What is a terrestrial ecosystem?

Q2: What are the different types of terrestrial ecosystems?

Q3: How does climate affect terrestrial ecosystems?

Q4: What are the key features of desert ecosystems?

Q5: What is the significance of biodiversity in terrestrial ecosystems?

MCQs

1. Which of the following is not a type of terrestrial ecosystem?

a) Forest

b) Grassland

c) Ocean

d) Desert

2. What is the primary factor that differentiates terrestrial ecosystems from aquatic ecosystems?

a) Presence of vegetation

b) Presence of water bodies

c) Location on land

d) Climatic conditions

3. Which of the following ecosystems is characterized by low precipitation and extreme temperatures?

a) Forest

b) Tundra

c) Desert

d) Grassland

4. What type of terrestrial ecosystem is typically found in the Arctic regions?

a) Desert

b) Tundra

c) Forest

d) Grassland

5. What is the primary source of energy in a terrestrial ecosystem?

a) Water

b) Wind

c) Sunlight

d) Soil

GS Mains Questions on Model Answers

Q1. Explain the significance of biodiversity in terrestrial ecosystems and the threats it faces today.

Answer: Biodiversity in terrestrial ecosystems plays a critical role in maintaining ecological balance, contributing to ecosystem services such as pollination, nutrient cycling, and soil formation. It also provides resources for humans, including food, medicine, and raw materials. However, biodiversity is under threat due to deforestation, habitat loss, climate change, pollution, and invasive species. These factors lead to the extinction of species and disrupt ecological processes, ultimately affecting the health of ecosystems and human well-being.

Q2. Discuss the impact of climate change on terrestrial ecosystems.

Answer: Climate change significantly affects terrestrial ecosystems by altering temperature, precipitation patterns, and the frequency of extreme weather events. Rising temperatures can shift species distributions, leading to changes in ecosystems such as forests turning into grasslands or deserts. Increased carbon dioxide levels affect plant growth, while droughts and floods damage ecosystems. Climate change also intensifies the threat of invasive species, pests, and diseases, disrupting food chains and ecosystem services. Protecting terrestrial ecosystems from climate change requires global cooperation, reforestation, and sustainable land management practices.

Q3. Analyze the role of forests in maintaining the ecological balance of terrestrial ecosystems.

Answer: Forests play a vital role in maintaining the ecological balance of terrestrial ecosystems by acting as carbon sinks, regulating the Earth's climate, and supporting biodiversity. They provide habitat for numerous species, stabilize soil, prevent erosion, and maintain the water cycle. Forests also contribute to nutrient cycling and serve as a source of resources for human societies, including timber, fuel, and medicinal plants. Deforestation, however, disrupts these functions, leading to biodiversity loss, climate change, and degradation of ecosystem services.

Previous Year Questions on  Terrestrial Ecosystems

1. UPSC CSE Prelims 2017

Question. What is the primary source of energy in a terrestrial ecosystem?

Answer: Sunlight

Explanation: In terrestrial ecosystems, sunlight is the primary source of energy. It drives photosynthesis in plants, which are the producers at the base of the food chain.

2. UPSC CSE Mains 2018

Question. Explain how deforestation impacts biodiversity in terrestrial ecosystems.

Answer: Deforestation leads to habitat loss, which is one of the primary drivers of biodiversity loss in terrestrial ecosystems. By removing trees and vegetation, deforestation destroys the homes of many species, leading to extinction and disrupting ecological processes such as nutrient cycling and carbon sequestration. It also contributes to climate change by increasing atmospheric carbon dioxide levels, further threatening biodiversity.