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Key Knowledge: the impacts of climate change on food and fibre production
Key Knowledge: the impacts of climate change on food and fibre production
Welcome to Unit 4: Sustainable Production. This unit shifts our focus from managing specific pests to the big picture - how we maintain our industries in a changing global environment.
The first major challenge we face is climate change. In Australia, our food and fibre systems are uniquely vulnerable to shifts in temperature and rainfall patterns.
Key Impacts on Australian Production
Key Impacts on Australian Production
Climate change is defined as a long-term shift in global or regional climate patterns. For Australian producers, this isn't just about warming; it’s about variability and extremes.
While climate change can certainly bring about a rise in temperature, there are many other impacts that follow on from this.
This chart shows just a few of the important impacts of climate change on Australian producers.
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Principles of Sustainable Land Management
Principles of Sustainable Land Management
To combat these impacts, producers must move beyond traditional farming toward Sustainable Land Management. This is the careful use of land resources (soil, water, animals, plants) to meet changing human needs while ensuring the long-term productive potential of these resources.
Soil Health: Maintaining ground cover to prevent erosion and using minimum till techniques to keep carbon in the soil.
Water Stewardship: Moving from flood irrigation to precision drip systems to minimise evaporation and maximise the effective use of water.
Biodiversity: Maintaining windbreaks and native vegetation to provide shade for stock and habitat for beneficial insects.
Economic Viability: A farm isn't sustainable if it isn't profitable. Producers must diversify their income (e.g., growing two different crops).
PRACTICE
Use the marking scheme to evaluate your work
Skill Check: Make a Chain of Impact
Skill Check: Make a Chain of Impact
To satisfy the key skill of analysing impacts, you should be able to connect a climate change cause to a biological and then economic result.
The Task: Complete the chain for an Apple Orchard in the Goulburn Valley. You may need to do some online research to answer this, but see if you can think of some ideas first.
Climate Change Cause: Increased frequency of extreme heat days (>40°C).
Suggest a possible biological impact:
Suggest a possible economic consequence:
PRACTICE
Use the marking scheme to evaluate your work
Exam-Style Questions
Exam-Style Questions
Question 1 (2 Marks)
Question 1 (2 Marks)
Explain one principle of sustainable land management that could help a sheep farmer mitigate the impacts of increased drought frequency.
Question 2 (4 Marks)
Question 2 (4 Marks)
Analyse how a shift in rainfall patterns (winter rain arriving later in the season) would impact the production and quality of a Victorian winter grain crop.
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Research Question: How is the Northern Wheat Belt shifting in Australia?
The Task:
1. Use the BOM (Bureau of Meteorology) website to find the "Average Annual Rainfall" map for Victoria from 1960 and compare it to the map from 2020.
2. Identify one region where rainfall has decreased.
3. Write a one-paragraph summary: If you were a farmer in that region, what is one Sustainable Land Management strategy you would implement today to ensure your farm is still producing food in 2050?
Exam Tip: The Climate-Management Link
Exam Tip: The Climate-Management Link
In a Unit 4 exam, you will often be asked to provide a solution to a climate-related problem. The most common mistake is providing a general or very broad answer like "the farmer should use more water."
To get full marks, you must link the climate impact directly to a sustainable land management principle.
Weak Answer: "It's getting hotter, so the farmer should plant trees."
Stronger Answer: "Increased temperatures cause heat stress in livestock, reducing milk yield. A sustainable solution is to plant native shelterbelts (biodiversity/sustainable land management). This provides evaporative cooling and shade, reducing the animal's metabolic heat load and maintaining production, without increasing electricity or water use."
Study Tip: Don't Forget the Fibre!
Study Tip: Don't Forget the Fibre!
Students often focus heavily on Food (crops and meat) and forget about Fibre (wool, cotton, or timber).
The Catch: Climate change impacts fibre quality just as much as food.
The Fact: In sheep, a "break in the wool" occurs when a sheep experiences sudden stress (like a drought or heatwave). This significantly reduces the strength of the wool fibre, making it less valuable for high-end textiles.
Revision Strategy: When you research a climate impact, try to find one example for a plant (crop) and one for an animal (livestock/fibre).
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