Geography aqa A2 ecosystems

This has no pictures with it as I wanted to use it to listen to. But I hope it is helpful for other people. Oh and sorry for the bad formating but CBA to change it :).

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  • Created by: Rhys
  • Created on: 31-05-12 20:59
Preview of Geography aqa A2 ecosystems

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It is a system made up of living things and no-living things, biotic and a-biotic
Non living (a-biotic) such as:
Underlying rock
Soil characteristics
Relief of the land
Living (biotic) need a-biotic to survive such as
Micro organisms
Decomposers: an organism which takes the remains of dead plants and animals also
their excrement and converts it into carbon dioxide and nutrients.
Inputs outputs and stores in a ecosystem
Inputs in to an ecosystem:
Photosynthesis, where green plants use light, water and CO2 to create food for the plant.
Plants that do this are called autotrophs
Animals migrating into the area
Rock weathering, as this helps produce the soil and nutrients
Soil weathering this helps create nutrients for the plants
Stores in a ecosystems:
Biomass, this is the living organism within a ecosystems
Carbon in the ground as peat etc
Water is stored in the soils, plants and on top of the ground
Outputs in a ecosystem
Animal migrate out
Energy flow in a ecosystem
The sun is the main driving force behind all ecosystems as it provides all the heat for the ecosystem
and so heats up plants in their a biotic environment, the sun also drives the flow of the ecosystems

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It also provides the light needed for a plant to photosynthesise to provide
food for the plant
The plant then gets consumed by the primary consumer (herbivore) and then secondary consumers
(carnivore) and then to other organisms. This is a flow of energy in a ecosystem and is called a food
chain, each stage of the food chain is known as a trophic level such as plants are trophic level 1 and
primary consumers are trophic level 2 etc.…read more

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Ecosystems are not stagnate but rather evolve over time as the interactions between
different elements of an ecosystem means that they are all interlinked, as the climate
changes it affects the vegetation which affects the soil and so on.
The best way to see this development is to observe the change in the type of vegetation
within a community, this is called a seral progression and each stage's vegetation is known
as a sere.…read more

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Fore Dune
These form as more sands builds up on the dunes also embryo dunes join together to form a bigger
dune. It is not as hostile so plants like Sea Rocket start to grow. But Marram grass is still dominate in
this stage.
Yellow dune
As the dune continues to develop sand builds up. But as plants die they start to form soil, although
these are "yellow" because of the lack of soil. Conditions become better as further away from the
sea.…read more

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There are 6 major biomes these are:
Tropical rainforest
Temperate forest
Grassland/ savanna
They are distributed from the equator an are distributed the same either side where the coldest
Biomes (Tundra) nearest to the poles of the earth and the hottest parts (Tropical forest/ Deserts)
nearest to the equator.
Biomes are largely dependent on the temperature of a region and the average amount of rainfall in a
region.…read more

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Herb layer: this contains small plants these are mainly herbal plants such as the Mayapple
Ground zone-this has lichen, club mosses, and true mosses.
Soil type
Because in they cold seasons the trees drop their leaves there is a fertile soil which tends
to travel quite deep and this is typically split up into four zones, these are:
Humus ­ this is the decomposed leaf litter which has turned into fertile compost as it
cannot be decomposed any more.…read more

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The trees in this biome shed their leaves during the winter months this is so it can go into
hibernation this I due to the fact less water is available for photosynthesis and shorter days.
The leaves fall onto the forest floor and decay and enrich the soil with nutrients. So soil is
very fertile.…read more

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Newcastle city this is until it reaches the river
Tyne which is a cut off point for this corridor.…read more

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Surface roughness- allowing pants to get a hold- glass+ metal too smooth
Pollution levels- depends on previous usage of the site, some substances are toxic to plants
There are a verity of ways seeds can be deposited on a wasteland, these are:
They might be deposited from the previous land use
Be brought in by soil which is deposited in the area
By the wind as they dispersed from other areas where plants have colonised
Human arresting factors
Fly tipping
Land use of the…read more

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Many of these plants are known as ruderal species because they are able to tolerate waste ground,
rubbish and debris. Their roots will continue to help break up rocks and compacted soil.
Plant succession normally rapid at this stage.…read more



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