NATURAL FACTORS AND VEGETATION INTERACT?
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1 HOW DO NATURAL FACTORS AND VEGETATION INTERACT? Natural factors such as moisture, temperature, and soil affect vegetation. In turn, vegetation affects these natural factors. They interact. Why should you care about this? As you read in Chapters 1 and 2, Earth is a place of change. Its climate and landforms change over time. Natural vegetation changes too. Earth s systems are interconnected. A change in one system can lead to changes in the others. When we learn about how plants grow, how they interact with the environment around them, and how they affect us and the planet, we gain a better overall understanding of Earth and our place on it. First, let s look at how three natural factors affect vegetation. Two main factors are moisture and temperature, which are part of the climate system. The third main factor is soil. MOISTURE Plants need moisture to survive (Figure 3.8). The moisture in a region depends on the amount of precipitation and evaporation that occurs there. PRECIPITATION The amount of precipitation, moisture that falls to the ground, such as rain or snow, differs from region to region. Plants adapt to the amount of precipitation in their region. Grasses can survive with low amounts of precipitation. Trees need more water than grasses do. This is why grasslands are more common than s in hotter, drier areas. This is also why s grow best where moisture is available year round, especially during the growing season. FIGURE 3.8 Fog (evaporation) surrounds this mixed. The trees take in moisture through their roots. I wonder how much moisture a mixed needs compared to a grassland? How does precipitation affect plants? 84 UNIT 1: Physical Patterns in a Changing World
2 READING THEMATIC MAPS Annual Precipitation Rates in North America 180 W 160 W 140 W 120 W 80 W 60 W 40 W 100 W 20 W ARCTIC OCEAN le irc cc i t c Ar N 60 A thematic map shows one topic or theme within a geographic area, such as the Global Natural Vegetation Regions map on page 77 (Figure 3.2). The topic or theme is identified in the legend. Thematic maps use symbols and colours to help users see patterns and find important geographic relationships. The purpose of these symbols or colours is identified in the legend. Often thematic maps include some location information, such as lines of latitude and longitude. On some maps, water bodies and places may have name labels, depending on the theme. Thematic maps will also include a scale and north arrow. Figure 3.9 is one example of a thematic map. It uses colours to represent the different values shown on the map. Precipitation rates vary from place to place. By using a thematic map to show the annual rates of precipitation across an area, we are able to quickly see any patterns or interrelationships. N 60 N PACIFIC OCEAN 40 N N 40 Precipitation (mm) ATLANTIC OCEAN Tropic of Cancer N FIGURE 3.9 This map shows total yearly precipitation, measured in millimetres km 100 W 60 W HOW TO READ A THEMATIC MAP Review Figure 3.9. Read the title. What is the theme or topic? What is the location? Explain the meaning of the topic to another person. Geography 7 SB STEP 1 STEP X Look for patterns you can see on the map. What 3 C03-F10-GO7SBSTEP (redo) factors might explain thefn patterns? CO Crowle Art Group 3rd pass Pass Approved Identify how precipitation rates might affect Not Approved patterns of natural vegetation around the world. STEP 4 Read the legend. Identify the colours on the map. How does the legend show the colours? What units of measurement are used in the legend? Most precipitation maps use blue as a colour. Can this be an exception to the rule? Make connections. What other natural systems might show similar patterns? STEP 5 CHAPTER 3: Changing Patterns of Natural Vegetation 85
3 EVAPORATION Plants are affected by the amount of moisture that evaporates from the ground. Places with high temperatures have high evaporation rates. The moisture leaves the soil more quickly in these regions than in regions with lower temperatures. Plants in hot regions will not grow as well as plants in places with less extreme temperatures. TEMPERATURE Plants are affected by the amount of solar energy or heat in a region. During photosynthesis they use sunlight for energy. Also, the amount of heat that plants receive depends on their location and the temperatures there. PHOTOSYNTHESIS Plants use energy from the Sun during photosynthesis. The photosynthesis of a plant increases as the temperature rises. Plants do not usually start growing until the daytime temperature reaches 6 C. Plants usually grow well at temperatures of around 20 C. At very high temperatures, photosynthesis slows down, and plants do not grow as well. LATITUDE AND ELEVATION Temperatures are higher near the equator and lower near the poles. As a result, vegetation changes as the latitude changes. As you learned in Chapter 2, air is colder at higher elevations. This affects the natural vegetation, such as trees, that grows on mountainsides. The treeline is the transition zone where a ends because the climate has become too cold or too dry (Figure 3.10). 86 UNIT 1: Physical Patterns in a Changing World treeline an area or region beyond which trees do not grow because of dry or cold conditions FIGURE 3.10 In this photo of a mountain in Alberta, you can see exactly where the treeline begins. What differences would I notice if I were standing at the treeline?
4 Look at Figure What types of trees can grow where it is colder? How are they different from other types of trees? The answers give clues about how trees adapt to colder temperatures. FIGURE 3.11 This figure shows how types of vegetation adapt to ranges of temperature and precipitation levels Temperature and Precipitation Ranges of Natural Vegetation Regions tundra and highmountain vegetation Decreasing temperature ( C) cold desert hot desert mid-latitude grassland tropical grassland mixed semi-desert scrub broadleaf deciduous needleleaf evergreen or boreal Mediterranean subtropical broadleaf tropical broadleaf Increasing precipitation (mm) SOIL Soil is an anchor for a plant. As the plant grows, its roots grip the soil. Soil plays a key role in the health of most plants. Plants need nutrients to grow, and they absorb these from the soil. In agriculture, if the soil does not have enough nutrients for crops to grow, farmers may use fertilizers, which add nutrients to the soil. HOW VEGETATION AND CLIMATE INTERACT You have read about the ways in which the climate, including moisture and temperatures, and soil affect natural vegetation. Natural vegetation has an effect on the climate, too. In fact, natural vegetation and the climate affect each other. Here are two examples: It rains in a mid-latitude grassland. Plants take in the water through their roots. They use some of it for photosynthesis to grow and reproduce. They return what they do not use to the air. As the plants continue to grow larger, they use more and more of the moisture and return less to the air. This makes the overall climate in that particular region drier over time. Leaves absorb sunlight, which is energy from the Sun, to use in photosynthesis. This cools the air. When the air is cool, less moisture is evaporated, and more moisture is available for plants, which helps them live and reproduce. CHAPTER 3: Changing Patterns of Natural Vegetation 87
5 HOW VEGETATION, CLIMATE, AND SOIL INTERACT Vegetation, climate (moisture and temperature), and soil interact with one another, too. Here are three examples: Plants and animals decay on the surface of the ground and become humus (Figure 3.12). Humus is full of nutrients. Rainfall carries the nutrients down into the top layer of the soil. Here, they are available to the roots of living plants. Warm temperatures encourage plant growth. Eventually these plants die and decompose. As a result, warm, moist places, such as a broadleaf deciduous vegetation region, generally have excellent soils for plants. humus decaying plant and animal matter found in the top layer of soil FIGURE 3.12 This diagram shows how plants, precipitation, and soil interact. Older plants die. Dead plants decay to humus, which contains nutrients. Living plants use nutrients from humus to grow. Precipitation moves the humus into the soil. The humus is further decomposed by organisms such as earthworms. When rain washes away the top nutritious layer of the soil, the soil loses fertility, making it more difficult for plants to grow. If there are plants growing in the soil, however, they can help prevent this. The roots of the plants anchor the soil. The plants leaves stop raindrops from hitting the ground hard enough to wash away the soil particles. A growing amount of evidence suggests that the Sahara Desert was created over time by interactions between the climate, the natural vegetation, and the soil. Read the timeline, Figure 3.13, to find out more about how grasslands changed to desert. 88 UNIT 1: Physical Patterns in a Changing World
6 Grasslands cover what is now the Sahara Desert. People live in the area with grazing animals BCE FIGURE 3.13 This timeline describes how the Sahara Desert, in the northern part of Africa, may have been created by climate and vegetation interactions. Note that BCE means before the Common Era. The climate becomes hotter and drier due to natural causes. With less moisture available, grasses do not grow well BCE As the grasses die, more soil is exposed to sunlight. The soil dries and starts to crack. A severe desert environment is created BCE CHECK-IN 1. INTERRELATIONSHIPS Create an ideas web that shows some of the interactions between vegetation, climate, and soil. 2. INTERRELATIONSHIPS In some parts of Canada, such as in the mixed regions of Ontario, the soil is deep and fertile. In other places, such as the tundra regions, soil is thin and poor. What factors help to create soils? What role does natural vegetation play in creating soils? Create a diagram or a chart to show your ideas. 3. SPATIAL SIGNIFICANCE Use Figure 3.2 (page 77) and a political map of the world to locate a community in two of these types of vegetation regions: mixed tundra and high-mountain vegetation tropical grassland CHAPTER 3: Changing Patterns of Natural Vegetation 89
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