Ecozones: How Climate, Soil, Vegetation and Communities Connect

Everything is connected

Fly over Saskatchewan in August and you see a patchwork of golden wheat and bright yellow canola. Fly over northern Ontario and you see dark green spruce forest, rock and lakes to the horizon. Fly over Nunavut and you see no trees at all. These differences are not random. Climate shapes vegetation, vegetation shapes soil, and all of them, together with landforms, shape what people do and where communities grow.

Geographers have a tool for seeing these connections: the ecozone.

Canada's ecozones

An ecozone is a large area where landforms, climate, soils, plants, animals and human activities form a recognizable pattern. Canada is divided into 15 terrestrial (land) ecozones (and several marine ones). Here are some you will meet in this course:

• Arctic ecozones (Northern Arctic, Southern Arctic, Arctic Cordillera): tundra, permafrost, very cold, dry, long winters.
• Taiga ecozones (Taiga Plains, Taiga Shield, Taiga Cordillera): open, stunted forest near the treeline.
• Boreal Shield: the largest ecozone; boreal forest on Shield rock with countless lakes.
• Boreal Plains: boreal forest on the flat Interior Plains.
• Hudson Plains: wetlands and muskeg around Hudson and James bays.
• Prairies: natural grassland (now mostly farmland), chernozem soils.
• Montane Cordillera and Pacific Maritime: mountain forests, and the temperate rainforest of the B.C. coast with giant cedars and Douglas firs.
• Mixedwood Plains: mixed and deciduous forest on the Great Lakes–St. Lawrence Lowlands; Canada's most heavily populated ecozone.
• Atlantic Maritime: mixed forest, rocky coasts and fertile valleys in the Maritimes and Gaspé.

Notice that ecozone names often combine a vegetation or climate word (Boreal, Taiga, Arctic) with a landform word (Shield, Plains, Cordillera). That is the whole idea: ecozones are where physical systems overlap.

Soils: where climate meets rock

Soil forms from parent material (weathered rock or glacial deposits) plus climate, living things, slope and time. Two Canadian soils show how much climate and vegetation matter:

• Chernozem forms under grassland in the drier, continental Prairies. Grass roots die back every year and add lots of humus, making a thick, dark, fertile topsoil. With modest precipitation, nutrients are not washed away. These soils make the Prairies one of the world's great grain-growing areas.
• Podzol forms under the boreal forest in cooler, wetter places. Fallen needles make the soil acidic. Water soaking down leaches iron and nutrients out of the upper soil, leaving a grey, bleached layer, and deposits them lower down as a reddish layer. Podzols are thin and poor for crops.

In the Arctic, cryosolic soils sit on permafrost; in wetlands, organic (peat) soils build up. Canada's soil classification system recognizes ten soil orders in all.

From physical characteristics to communities (B2.1)

Now connect the physical environment to human activities and communities. Each example shows an interrelationship, a two-way link between the land and the people.

1. Prairies ecozone. Flat land + chernozem soils + warm summers + about 300 to 500 mm of precipitation → grain and oilseed farming (wheat, canola, barley), with ranching in the driest areas. Communities: small farm towns spaced along rail lines, with grain elevators. Drought is the big risk.

2. Boreal Shield. Ancient rock with metals + thick forest + rivers dropping over rocky land + lakes → mining (Sudbury, Timmins, Red Lake), forestry, hydroelectricity and tourism (cottages, canoe routes, fishing). Communities: resource towns that often depend on one industry, and many First Nations communities, where hunting, trapping, fishing and harvesting on the land remain important to food, culture and identity alongside wage work. Thin soils and a short growing season limit farming.

3. Mixedwood Plains. Fertile soils + mild climate (for Canada) + flat land + the Great Lakes and St. Lawrence River for water and shipping → intensive farming (including fruit in the Niagara area), manufacturing, and Canada's largest cities. Roughly half of Canada's people live in this small ecozone.

4. Pacific Maritime. Mild, very wet climate + huge trees + rivers full of salmon + a long, sheltered coast → forestry, fishing, ports for trade with Asia, and tourism. Coastal First Nations such as the Haida and Nuu-chah-nulth have deep, ongoing relationships with the forests and the sea.

5. Arctic. Permafrost + tundra + sea ice + long, dark winters → Inuit communities whose ways of life include hunting and fishing (caribou, seal, Arctic char), along with jobs in government, mining and tourism. Buildings stand on piles or gravel pads so their heat does not thaw the permafrost. With no roads to most communities, supplies arrive by air or by sealift ships in summer, which makes food and fuel expensive.

6. Atlantic Maritime. Long coasts and rich offshore banks → fisheries (once famous for cod; the northern cod fishery was closed in 1992 after stocks collapsed; today shellfish such as lobster and snow crab are very important); fertile valleys and Prince Edward Island's red soils → potato and other farming.