B7.5
- Created by: amy_mair
- Created on: 19-06-16 21:06
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- Ecosystems
- B7.5
- Human impacts on ecosystems
- 1. Farmers use fertilisers to give plants extra nutrience
- 2. Humans take biomass out of ecosystems for their own use
- 3. Humans often clear natural areas of vegetation in ecosystems this means that they can grow agricultral crops and raise livestock
- 4. Human activitities create non recyclable waste which can not be reused
- Humans are not closed loop systems
- 1. Human systems create non- recyclable waste
- 2. Many human systems use fossil fuels such as crude oil as an energy source
- Managing Ecosystems
- Humans rely on ecosystems
- 1. Ecosystems provide us with clean air, water and food
- 2. They provide humans with fertile soil
- Most crop production also needs pollination. It is an ecosystem service
- Humans need to use resources in sustainable ways
- 1. Sustainaility means meeting the needs of todays population without harming the environment for future generations
- 2. One part of this is using natural resources at a rate which they can be replaced naturally
- 1. Fishing quotas have been introduced. This means that they will still be around in the future
- 2. To make the production of wood and paper sustainable people have to plant new trees for each they chop down
- Sunlight
- 1. The suns energy is sustainable because it can not be used up by human activities
- It can be used to make a sustainable profit of food by photosynthesis
- Can be used for sustainable agriculture
- Conserving natural ecosystems
- 1. Sometimes communities have to decide between causing damage to an ecosystem to get the resources they need and protecting an ecosystem
- 2. For example population growth in many areas means that more people have to be fed
- 3. This causes tensions as people have to decide if it is worth increasing food production
- Humans rely on ecosystems
- Human impacts on ecosystems
- Perfect Closed loop systems
- 1. In a perfect closed loop system, all the outputs from processes or strores within the system are recycled- they are used as inputs
- 2, There are no outputs from a perfect closed loop system ( there is no waste) and there are no inputs to it
- 3. However most systems are not perfect closed loops they have inputs to them and outputs from them too
- Closed loop systems
- Ecosystems are an example of this
- 1. Oxygen is a waste product which is produced by plants during photosynthesis. It is used by plants, animals as a reactant during respiration
- 2. Carbon dioxide is a waste product of respiration yet used by plants in photosynthesis
- 3. Dead organic matter is used by microorganisms as food
- 4. Mineral nutrients are produced by microorganisms when their digestive enzyme breaks down organic matter
- 5. Many organisms produce large quantities of reproductive structures
- Stable ecosystems
- 1. No ecosystem is a perfect closed loop system because some outputs are always lost
- 2. In a stable ecosystem losses are balanced by gains
- 3. Large amounts of vegetation grow in stable ecosystems
- B7.5
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