Section 1 | B.Sc. 3rd Year
Natural resources are materials, organisms, environmental conditions and natural processes that occur in nature and are useful to humans and other living organisms. They include resources such as sunlight, air, water, soil, forests, wildlife, minerals, fossil fuels and the genetic diversity of organisms.
The term resource does not simply mean something that exists in nature. A natural component becomes a resource when humans recognize its usefulness and possess the knowledge, technology and social systems necessary to use it. Therefore, the concept of a resource can change with time.
Uranium existed naturally long before humans understood nuclear fission. For ancient societies it had little practical importance. With the development of nuclear science, uranium became an important energy and industrial resource. This demonstrates that technological development can change the value of a natural material.
Natural resources: Naturally occurring substances, organisms and environmental components that have actual or potential utility to humans and support ecological processes and human well-being.
Natural resources have much broader value than their direct market price. A forest, for example, provides timber but also stores carbon, protects soil, regulates water flow, provides wildlife habitat and supports cultural practices.
The major values of natural resources can be classified as follows.
| Type of value | Explanation | Example |
|---|---|---|
| Direct use value | Benefits obtained through direct use of a resource. | Timber, drinking water, fish, fuelwood. |
| Indirect use value | Benefits obtained through ecosystem functions. | Flood regulation, soil formation, water purification. |
| Option value | Value associated with keeping a resource available for future use. | Undiscovered medicinal compounds in wild plants. |
| Existence value | Value derived from knowing that a species or ecosystem continues to exist. | Existence of snow leopard populations. |
| Cultural value | Importance associated with traditions, religion, identity and heritage. | Sacred forests, rivers and mountains. |
Renewable resources are resources that can naturally regenerate or replenish within a relatively short period when their rate of use does not exceed their regenerative capacity.
Examples include forests, water, fisheries, biomass, solar radiation and wind energy.
Non-renewable resources occur in finite quantities or require geological time scales for their formation. Their extraction generally reduces the remaining stock.
Examples include coal, petroleum, natural gas, metallic ores and many mineral deposits.
Biotic resources originate from living organisms or biological systems. Examples include forests, wildlife, livestock, fisheries and medicinal plants.
Abiotic resources are non-living components of the environment such as water, air, soil, sunlight and minerals.
An actual resource is a resource whose quantity, quality and economic usefulness are sufficiently known and which is currently being used.
A potential resource is known or suspected to exist but is not yet fully utilized because of technological, economic, environmental or institutional limitations.
| Basis | Types | Examples |
|---|---|---|
| Regeneration | Renewable / Non-renewable | Forest / Petroleum |
| Origin | Biotic / Abiotic | Wildlife / Minerals |
| Development status | Actual / Potential | Existing irrigation / Untapped hydropower site |
| Distribution | Ubiquitous / Localized | Sunlight / Certain mineral deposits |
Natural Resource Management (NRM) is the systematic planning, development, utilization, conservation and restoration of natural resources so that present needs can be fulfilled without destroying the ability of future generations to meet their needs.
NRM is therefore not simply about protecting resources. It involves finding an appropriate balance between resource use, conservation, livelihoods, economic development and ecological integrity.
Human demand for natural resources has increased greatly with population growth, urbanization, industrialization, technological development and rising standards of living.
Historically, human communities consumed resources primarily for food, shelter and basic energy requirements. Modern societies consume much larger quantities of water, minerals, fossil fuels, land, timber and energy for transportation, construction, manufacturing, agriculture and digital infrastructure.
Resource depletion is the reduction in the quantity, quality or availability of a natural resource because of excessive extraction, consumption, degradation or environmental change.
Depletion can occur even in renewable resources. For example, a forest may technically be renewable, but repeated harvesting faster than natural regeneration can reduce forest biomass, soil fertility and biodiversity.
Management of depleted resources requires both reduction of pressure and recovery of the resource base.
Sustainable development means development that satisfies present needs while maintaining the environmental, social and economic conditions necessary for future generations.
Sustainability requires integration of three major dimensions: environmental protection, social well-being and economic development.
A hydropower project can provide electricity and economic benefits, but sustainable planning requires consideration of downstream water flow, sediment movement, aquatic ecosystems, local livelihoods, land acquisition and disaster risk. The objective is not simply to generate electricity but to manage the wider environmental and social system.
Natural resource governance refers to the institutions, laws, policies, rules and decision-making processes through which natural resources are controlled, allocated, used and conserved.
Good resource governance should promote transparency, accountability, scientific decision-making, participation, equity and long-term sustainability.
Discuss the concept, values and types of natural resources and explain the principles of natural resource management.
For a 10-mark answer, begin with the definition of natural resources, explain their characteristics and values, classify them with examples, define NRM, discuss its objectives and principles, explain resource depletion and sustainable utilization, and conclude with the importance of participatory management.
Water is one of the most fundamental natural resources on Earth. It is essential for drinking, sanitation, agriculture, livestock, industry, hydropower, transportation, ecosystems and biodiversity.
Although water is abundant globally, usable freshwater is limited and unevenly distributed. Therefore, water-resource management is concerned not only with the total quantity of water but also with its availability, quality, timing, distribution and accessibility.
The hydrological cycle, or water cycle, is the continuous movement of water between the atmosphere, land surface, oceans, rivers, glaciers, soil and groundwater.
1. Evaporation: Conversion of liquid water into water vapour due to solar energy.
2. Transpiration: Loss of water vapour from plants, mainly through stomata.
3. Evapotranspiration: Combined loss of water through evaporation and plant transpiration.
4. Condensation: Conversion of water vapour into liquid water droplets as air cools.
5. Precipitation: Water falling from the atmosphere as rain, snow, sleet or hail.
6. Infiltration: Entry of water into the soil.
7. Percolation: Downward movement of infiltrated water through soil and rock.
8. Runoff: Movement of water over land surface toward streams and rivers.
9. Groundwater recharge: Addition of water to groundwater reservoirs.
| Source | Description | Examples |
|---|---|---|
| Surface water | Water present above the ground. | Rivers, lakes, reservoirs, ponds. |
| Groundwater | Water stored below the ground in soil and rock formations. | Aquifers, wells, tube wells. |
| Glaciers and snow | Frozen water stored at high elevations. | Himalayan glaciers. |
| Rainwater | Water received directly from atmospheric precipitation. | Rainwater harvesting. |
| Wetlands | Land areas saturated with water seasonally or permanently. | Lakes, marshes, swamps. |
Nepal possesses a dense river network because of its steep topography, monsoon climate and Himalayan snow and glacier systems. The National Water Plan reports more than 6,000 rivers and estimates average annual runoff from Nepal's river systems at about 225 billion cubic metres (BCM). The major river systems include the Mahakali, Karnali, Narayani (Gandaki) and Saptakoshi. :chatgpt-content-reference{index="1"}
The same source notes that Nepal's southern rivers originating in the Siwalik region may have relatively low dry-season flow but can produce flash floods during the monsoon. This illustrates an important feature of Nepal's water resources: water may be abundant annually but not necessarily available at the right place and time. :chatgpt-content-reference{index="2"}
Estimated average annual runoff of Nepal's river systems: about 225 billion m³ per year.
This figure should be presented as an estimate based on the cited water planning data rather than as a fixed annual quantity because runoff varies spatially and seasonally. :chatgpt-content-reference{index="3"}
| River system | General importance |
|---|---|
| Koshi | Major Himalayan river system with importance for irrigation, hydropower, ecosystems and downstream agriculture. |
| Narayani / Gandaki | Important for hydropower, irrigation, ecosystems and transboundary water systems. |
| Karnali | Large Himalayan river system with significant hydropower and ecological importance. |
| Mahakali | Important western river system with transboundary significance. |
| Bagmati | Important for Kathmandu Valley and surrounding areas but affected by urbanization and pollution. |
| West Rapti | Important for agriculture, settlements and flood management. |
Water is required for drinking, cooking, washing, sanitation and household activities.
Agriculture is one of the major consumers of freshwater. Irrigation becomes particularly important during dry seasons when rainfall is insufficient for crop production.
Industries use water for processing, cooling, cleaning, manufacturing and waste treatment.
Nepal's steep elevation gradients and river systems provide important conditions for hydropower generation.
Rivers, wetlands and lakes provide habitat for aquatic organisms and maintain ecological processes.
Water depletion occurs when water withdrawal or loss exceeds the rate at which the resource can be replenished, or when pollution reduces the amount of water that remains suitable for use.
Water depletion may therefore be both a quantity problem and a quality problem.
Rapid urban growth has increased demand for groundwater and piped water. During dry periods, dependence on groundwater and limited surface-water supplies can place pressure on the valley's water system. This demonstrates why demand management, recharge, leakage reduction, rainwater harvesting and alternative water sources are important parts of urban water management.
Water may remain physically present while becoming unusable because of pollution. Domestic sewage, industrial effluent, agricultural runoff, solid waste and other pollutants can reduce water quality.
For example, excessive nutrients can promote eutrophication, while pathogenic microorganisms can make water unsafe for drinking.
Water resource management is the coordinated planning and management of surface water, groundwater, watersheds, ecosystems and human demands to ensure adequate quantity and quality of water over the long term.
Integrated Water Resources Management (IWRM) recognizes that water resources are interconnected with land, ecosystems, agriculture, energy, industry and human settlements.
For example, deforestation in an upper watershed may increase erosion and sediment transport downstream, affecting irrigation canals, reservoirs and aquatic ecosystems. Therefore, water cannot be managed independently of land and forests.
Describe the water resources of Nepal and discuss their uses, depletion and management.
For the answer, include the hydrological cycle, major sources of water, major river systems of Nepal, quantitative information, uses, causes of depletion, pollution, management strategies and a Nepal-based example.
Land is a fundamental natural resource that includes not only the physical surface of the Earth but also soil, terrain, vegetation, drainage characteristics, climate and ecological processes associated with a particular area.
In natural resource management, land is therefore considered a multifunctional resource. It provides space for agriculture, forests, settlements, infrastructure, wildlife habitats, industries and recreational activities.
Land use refers to the human utilization or management of land for particular purposes.
| Land use | Examples |
|---|---|
| Agricultural land | Cropland, orchards, irrigated fields. |
| Forest land | Natural forests and managed forests. |
| Grazing land | Pastures and rangelands. |
| Settlement | Villages, towns and cities. |
| Industrial land | Factories and industrial zones. |
| Conservation land | Protected areas and wildlife habitats. |
| Infrastructure | Roads, dams, airports and transmission systems. |
Land degradation is the decline in the productive capacity, environmental quality or ecological functions of land.
Land degradation can result from soil erosion, nutrient depletion, salinization, compaction, contamination, deforestation, overgrazing, unsustainable cultivation and unplanned development.
Removal of topsoil by water or wind. Water erosion is particularly important in hilly and mountainous landscapes.
Continuous cultivation without adequate nutrient replacement can reduce soil fertility.
Repeated movement of heavy machinery or livestock can reduce pore spaces and restrict root growth and water infiltration.
Accumulation of soluble salts in soil can reduce plant growth, especially in poorly drained irrigated areas.
Industrial chemicals, pesticides, heavy metals and waste can contaminate soil.
In steep terrain, slope instability can remove soil and vegetation and damage agricultural land and infrastructure.
In the mid-hills of Nepal, cultivation on steep slopes without adequate terracing, vegetative cover or drainage management can accelerate soil erosion during intense monsoon rainfall. Properly designed terraces, contour farming, vegetation and watershed management can reduce this pressure.
Land resource management involves planning and controlling land use so that land remains productive, environmentally stable and socially useful over the long term.
Land-use planning is the systematic process of determining the most appropriate use of different areas based on physical suitability, environmental limitations, economic needs and social priorities.
For example, highly fertile agricultural land should not automatically be converted into urban settlements when alternative sites are available. Similarly, unstable steep slopes may require conservation rather than intensive construction.
Explain the concept of land resources and discuss land degradation and its management.
A complete answer should include definition, components, land-use types, causes and forms of degradation, impacts, conservation measures, land-use planning and a Nepalese example.
Minerals are naturally occurring inorganic substances with characteristic chemical compositions and physical properties. Mineral resources are geological materials that have actual or potential economic, industrial or technological value.
Minerals form over geological time through processes such as crystallization, sedimentation, metamorphism, hydrothermal activity and weathering.
Metallic minerals contain metals that can be economically recovered.
Examples include iron, copper, lead, zinc, gold, silver, nickel, chromium and uranium.
These minerals do not primarily serve as sources of metals and are used for construction, industrial, chemical and other purposes.
Examples include limestone, dolomite, gypsum, mica, clay, quartz, magnesite and feldspar.
These are minerals valued for beauty, rarity, durability or ornamental use.
Examples include ruby, sapphire, aquamarine, tourmaline, quartz and beryl.
These include materials used in buildings, roads and infrastructure. Examples include sand, gravel, boulders, limestone, marble, granite and slate.
Fuel minerals are used primarily as sources of energy. Examples include coal and petroleum-related resources.
Nepal has considerable geological diversity because of its position within the Himalayan geological system. The Department of Mines and Geology reports that more than 1,000 mineral deposits and occurrences have been identified in Nepal. It also reports 64 identified mineral commodity categories, including metallic minerals, industrial non-metallic minerals, gemstones, construction materials and fuel minerals. :chatgpt-content-reference{index="4"}
| Mineral group | Examples reported in Nepal | Major uses |
|---|---|---|
| Metallic | Iron, copper, lead, zinc, gold | Metallurgy, manufacturing, electronics. |
| Industrial non-metallic | Limestone, magnesite, dolomite, clay | Cement, ceramics, chemicals, refractories. |
| Gemstones | Ruby, sapphire, tourmaline, aquamarine | Jewellery and ornamental use. |
| Construction materials | Sand, gravel, granite, marble, slate | Buildings, roads and infrastructure. |
| Fuel resources | Coal, petroleum-related resources, natural gas | Energy and industrial applications. |
The distribution of minerals is closely associated with Nepal's geological units. According to the Department of Mines and Geology, the Terai and Siwalik/Chure regions have potential for petroleum-related resources and construction aggregates; the Lesser Himalaya contains potential for metallic and industrial minerals and precious/semi-precious stones; the Higher Himalaya contains potential for gemstones, marble and metallic minerals; and the Tethys Himalaya has potential for limestone, salt, gypsum and natural gas. :chatgpt-content-reference{index="5"}
Mineral extraction involves removing economically useful geological materials from the Earth. Depending on the geological setting, extraction may involve open-pit mining, underground mining, quarrying, drilling or other methods.
Limestone extraction can supply raw material for cement production and support construction and employment. However, poorly managed quarrying can alter hillsides, generate dust and noise, increase erosion and affect nearby water systems. Therefore, the economic benefit of mineral extraction needs to be accompanied by environmental assessment, controlled extraction and site rehabilitation.
Minerals are largely non-renewable on human time scales. Sustainable mineral management therefore emphasizes efficient extraction, reduction of waste, environmental safeguards, recycling and rehabilitation of mined areas.
The Department of Mines and Geology is the government organization responsible for geological surveys, mineral exploration and administration of mining rules and regulations in Nepal. Its activities include exploration, evaluation, promotion of mineral-based industries and administration of mineral and mining regulations. :chatgpt-content-reference{index="6"}
The Department's mineral exploration activities include geological mapping, geophysical and geochemical exploration, drilling, sampling, resource/reserve estimation and environmental studies. :chatgpt-content-reference{index="7"}
Discuss the types, importance and status of mineral resources in Nepal. Explain the environmental consequences of mineral extraction and measures for conservation.
Mountains are complex natural systems characterized by steep slopes, large changes in elevation, diverse climatic conditions and high ecological heterogeneity.
Nepal is predominantly mountainous and contains some of the world's highest peaks. Its mountain landscapes provide water, forests, biodiversity, pasture, minerals, tourism opportunities and cultural resources.
| Resource | Importance |
|---|---|
| Water | Snow, glaciers, springs and rivers support downstream agriculture, drinking water, ecosystems and hydropower. |
| Forests | Provide timber, fuelwood, fodder, medicinal plants and ecosystem services. |
| Biodiversity | Mountain habitats support unique plants and animals. |
| Rangelands | Provide grazing resources for livestock. |
| Minerals | Mountain geology contains metallic, non-metallic and gemstone resources. |
| Tourism | Mountaineering, trekking, ecotourism and cultural tourism provide income and employment. |
| Hydropower | Steep elevation gradients and river systems provide hydropower opportunities. |
| Cultural resources | Mountains have religious, cultural and traditional significance. |
Mountain ecosystems play a critical role in storing and releasing water through snow, glaciers, groundwater and mountain wetlands. The Hindu Kush Himalaya is therefore often described as a major Asian water tower. ICIMOD notes that mountain watersheds support livelihoods and food security for large downstream populations. :chatgpt-content-reference{index="8"}
This means that mountain resource conservation is not only a local concern. Changes in mountain ecosystems can affect downstream river flows, agriculture, hydropower, biodiversity and human settlements.
Large differences in altitude, temperature, rainfall and habitat conditions create ecological zones over relatively short horizontal distances. This produces high habitat diversity.
Mountain regions may support forests, alpine meadows, wetlands, glaciers, rocky habitats and river ecosystems. Species are adapted to particular elevation ranges and climatic conditions.
Mountain communities commonly depend on a combination of agriculture, livestock, forests, medicinal plants, tourism, trade and seasonal migration.
In high mountain areas, yak and other livestock contribute to household livelihoods through milk, meat, fibre and transport. Tourism may provide additional income through guiding, accommodation, porter services and sale of local products. Sustainable resource management therefore needs to consider both environmental conservation and livelihood security.
Scientific observations in the Himalaya indicate significant changes in glaciers, snow cover and permafrost associated with climate change. ICIMOD's HI-WISE assessment describes accelerated glacier melting, permafrost thaw, declining snow cover and changes in snowfall patterns across the Hindu Kush Himalaya. :chatgpt-content-reference{index="9"}
ICIMOD reports that Yala Glacier in Nepal has been steadily shrinking and retreating. Between 1974 and 2016, a retreat of about 354 metres was recorded, averaging roughly 8 metres per year over that period. This provides a concrete example of how cryospheric change can be monitored quantitatively. :chatgpt-content-reference{index="10"}
Mountain conservation should follow an integrated landscape approach because forests, soil, water, biodiversity and human livelihoods are strongly interconnected.
Mountain conservation is more effective when local communities are involved in planning, monitoring and benefit sharing. Local residents often possess detailed knowledge of springs, grazing areas, forests, wild plants, seasonal changes and hazards.
Combining local knowledge with scientific monitoring can improve resource management and increase community ownership of conservation programs.
Mountain resources should not be managed separately. For example, deforestation can increase soil erosion, which can increase sediment in rivers, which can affect irrigation systems and hydropower reservoirs. Similarly, climate-driven glacier change can influence downstream water availability and hazards.
Describe the major mountain resources and discuss their importance, threats and conservation measures with suitable examples from Nepal.
| Resource | Major Uses | Major Problems | Key Management Approach |
|---|---|---|---|
| Natural resources | Food, water, energy, materials, ecosystem services | Overuse and depletion | Sustainable utilization |
| Water | Drinking, irrigation, hydropower, industry | Pollution, scarcity, over-extraction, floods | Integrated water management |
| Land | Agriculture, settlement, forest, infrastructure | Erosion, degradation, urbanization | Land-use planning and soil conservation |
| Minerals | Industry, construction, technology | Depletion, pollution, habitat disturbance | Controlled extraction and rehabilitation |
| Mountains | Water, biodiversity, tourism, forests, energy | Climate change, erosion, landslides, unsustainable use | Integrated mountain conservation |