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    As i have said before my teacher for the ecosystems part of my geography course it TOTALLY CRAP so i haven't really learnt anything on it this year. So, i need some help with these questions. I can think of a basic answer but i want to get high marks, not like 3/8. Please help!

    (1) Explain how people's activities may lead to a plagioclimax community? (I only have a vague idea of what a plagioclimax actually is)

    (2) Outline the ways in which nutrients are cycled through a small scale ecosytem that you have studied (haven't studied one as far as i know lol)

    (3) Describe and explain the abiotic changes which occur during plant succession.

    (4) Explain the changes that take place in the physical conditions of a named succession (?!?)

    These are all worth 8 marks. Thanks.
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    (4) Explain the changes that take place in the physical conditions of a named succession (?!?)

    Hi Sian, I'm not sure what syllabus you're on because I'm doing Edexcel and we don't really have a lot of these questions. I can help with question 4 I think though...

    If you use the Ainsdale Dunes in Lancashire as an example of plant sucession of a psammosere (sand dune). (Btw, I'm not sure if this is what they mean by physical changes, but I'm taking that as meaning 'explain the plant sucession'??) Sand twitch is found ont he embryo dunes as it can withstand the salty conditions of the sea water (halophitic). As you move further inland, there is a more arid environment (xerophytic), so you find plants such as marram grass on the fore dune ridge and first dune ridge. As you move further inland still, the environment becomes more sheltered and more organic material is present in the soil so larger plants and shrubs grow here. The slacks in between the sand dunes are water-logged so reeds and rushes grow in these areas. If allowed to reach the climatic climax for the UK, oak and woodland would be found growing there. (I'm not sure if this is what the q is asking for, it's a bit odd. It might just be asking why, for instance, halophitic conditions are found near the sea and xerophytic more inland, and why organic material increases inland etc etc. Does the q give any more info?)
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    (Original post by Ellie4)
    (4) Explain the changes that take place in the physical conditions of a named succession (?!?)

    Hi Sian, I'm not sure what syllabus you're on because I'm doing Edexcel and we don't really have a lot of these questions. I can help with question 4 I think though...

    If you use the Ainsdale Dunes in Lancashire as an example of plant sucession of a psammosere (sand dune). (Btw, I'm not sure if this is what they mean by physical changes, but I'm taking that as meaning 'explain the plant sucession'??) Sand twitch is found ont he embryo dunes as it can withstand the salty conditions of the sea water (halophitic). As you move further inland, there is a more arid environment (xerophytic), so you find plants such as marram grass on the fore dune ridge and first dune ridge. As you move further inland still, the environment becomes more sheltered and more organic material is present in the soil so larger plants and shrubs grow here. The slacks in between the sand dunes are water-logged so reeds and rushes grow in these areas. If allowed to reach the climatic climax for the UK, oak and woodland would be found growing there. (I'm not sure if this is what the q is asking for, it's a bit odd. It might just be asking why, for instance, halophitic conditions are found near the sea and xerophytic more inland, and why organic material increases inland etc etc. Does the q give any more info?)
    Merci beacoup x
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    http://www.cix.co.uk/~argus/Dreambio...and%20dune.htm seems quite helpful
 
 
 

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