GEOGRAFIE - CLASA A XI A - FACTORII GEOECOLOGICI

Geoecological Factors

Geoecological factors shape environmental conditions and influence the distribution of living organisms and people. The environment includes relief, air, water, soil, living things, and human activity. These components are grouped into three broad categories:

• Abiotic factors: Nonliving parts of the environment, including climate, relief, water, and soil.
• Biotic factors: Living organisms and the relationships among them.
• Anthropogenic factors: Human activities and their effects on the environment.

1. Abiotic Factors

Cosmic and climatic factors

• Solar radiation is the main source of environmental light and heat. It supports photosynthesis, affects ecosystem development, influences atmospheric circulation, and heats Earth’s surface. Radiation is strongest near the Equator and generally declines toward colder regions.
• Light affects the growth and activity of plants and animals. Plants need it for photosynthesis, and organisms are adapted to different light levels. Some are light-loving, while others thrive in shade.
• Temperature determines where species can survive. Plants have temperature limits, while animals may respond to temperature changes by moving. Plants vary in their adaptation to temperature, from tropical species adapted to warmth to species adapted to colder conditions. Animals may be:
  • Eurythermal: Able to tolerate a wide range of temperatures, such as foxes and deer.
  • Stenothermal: Sensitive to temperature variation; seals and monkeys are given as examples.
• Precipitation and moisture affect water availability and the distribution of species. Organisms may be grouped by moisture requirements:
  • Hydrophilic: Aquatic organisms, such as algae and mollusks.
  • Moisture-loving: Species associated with very damp habitats, including reeds and crocodiles.
  • Mesophilic: Organisms adapted to moderately moist conditions.
  • Xerophilic: Organisms adapted to drought. Cacti, for example, reduce water loss with features such as spines or waxy leaf coverings.
• Wind influences temperature, humidity, transpiration, pollination, and plant form. Strong winds can encourage low, horizontally spreading growth, particularly in exposed high-altitude areas.

Relief (geomorphological factors)

Elevation, slope, rock type, and slope orientation affect settlement, farming, solar exposure, moisture, and wind.

• South-facing slopes are described as more favorable to drought-adapted plants.
• North-facing slopes tend to support plants that prefer more moisture.
• Altitude creates vertical zones of climate, vegetation, and soil. The lesson describes a lower forest zone—including oak, beech, and spruce belts—and a higher alpine zone with mountain vegetation and grassland.

Hydrological factors

Water in liquid form is essential to life. Plants develop different root systems to absorb water and minerals.

Rivers, lakes, groundwater, seas, and oceans support ecosystems and human activities such as water supply, navigation, food production, and industry. River-flow patterns, including flooding and drying, also affect the environment.

Soil (edaphic factors)

Soil consists of mineral material and decomposed organic matter. Its chemical composition, acidity, structure, and texture affect which plants and animals can live there.

Soil conditions influence plant nutrition, germination, water infiltration, aeration, and the activity of soil organisms. The lesson contrasts plants adapted to acidic and neutral soils and asks students to consider which plants grow in soils rich in particular minerals.

2. Biotic Factors

Biotic factors are the interactions among organisms in an ecosystem. These include relationships among plants, among animals, and between plants and animals.

• Competition: Organisms contend for resources such as light, food, water, space, or shelter. Crop plants, for instance, compete with weeds.
• Parasitism: One organism benefits at another’s expense. Mistletoe is presented as a semi-parasitic plant; tapeworms and ticks are animal examples.
• Cooperation and pollination: Organisms can provide services or shelter to other species. Insects pollinating plants are one example.
• Symbiosis or mutual benefit: Both species benefit from an association. Examples include fungi and higher plants, and bacteria living in termites’ digestive systems.
• Other animal relationships: In some associations, one species benefits from another’s shelter. The lesson gives clownfish and sea anemones as an example.
• Plant–animal effects: Animals can spread seeds or plant parts, while some plants depend on animals for reproduction or survival. These interactions influence where species occur.

3. Anthropogenic Factors and Environmental Impacts

Human activity can transform natural environments. Major influences include agriculture, industry, settlement, and resource use.

• Intensive agriculture may involve mechanization, irrigation, chemical fertilizers, and pesticides. Agricultural expansion and intensification can contribute to deforestation and soil and water pollution.
• Organic farming is presented as a more environmentally considerate approach that uses natural fertilizers and natural predators to control pests.
• Overuse of natural resources—including deforestation, hunting, fishing, and overgrazing—can reduce populations and contribute to species extinction.
• Industrial activity, dams, mining, and toxic waste can alter habitats and pollute the environment.
• Other highlighted problems include soil erosion, increased flood risk, desert expansion, polluted waterways, improper waste disposal, and air pollution from burning fossil fuels. The lesson connects these pressures with global climate change.
• Plastic is singled out because it is often discarded improperly and decomposes very slowly. Students are asked to suggest ways to reduce plastic consumption.
• The lesson emphasizes waste reduction and management, especially selective collection and recycling.

Activities and Suggested Actions

The lesson poses questions about the effects of light and temperature, changes in human life since the Neolithic period, species extinction, and ways to reduce plastic use and pollution.

It also proposes a project and poster about positive human influence, with possible topics including:

• Protecting threatened species through captive breeding and release.
• Protecting native species.
• Controlling natural fires.
• Reforestation.

Speakers and Sources

• One teacher or narrator presents the lesson and poses questions and activities.
• No other speakers or named external sources are identifiable in the subtitles.