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Explain the role of human activity in producing plagio-climax communities

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Introduction

Explain the role of human activity in producing plagio-climax communities A plagio-climax community is Plagio-climax communities are a natural succession altered by human activity often affecting species in an ecosystem. There are many reasons in which humans can affect plagio-climax communities. Humans can greatly affect how plagio-climax communities produce Firstly human disturbances in the rainforest can cause dramatic consequences. Pulp plantations can cause plagio-climax communities by removal of forests for use in paper making industry, the trees are then replaced with Rapid growing trees which are not native to the rainforest but . This means that original trees and shrub layer will be altered and nutrients from the soil replaced only in small quantities. For example in the Amazon rainforest thousands of acres of forestland are cut down for pulp. These species are then cut down and replaced by fast growing trees which produce better profits. Another example is the Amazon rainforest again where shifting cultivation occurs. ...read more.

Middle

This is good because it allows the wood to be sold but dramatically changes the environment because other vegetation cannot grow as most nutrients are used by trees regenerating. This is not a natural way an ecosystem functions and creates a plagio-climax community as humans have influenced the area. Furthermore, savanisation, the repeated burning of the forest floor, often used to clear unwanted shrub layers, such as heather it allows other plant life to thrive. A good example of this is in the uplands of Northern England. Originally covered by forests and small amounts of heather. During the middle ages the land was cleared and for sheep grazing and other agricultural processes. Every 15 years the heather is burnt to stop its progression into maturity and allows other plants to thrive in the area. The ash from the heather adds to the fertility of the land and results in a more productive ecosystem. ...read more.

Conclusion

This in addition to dumping materials into soils such as hazardous waste and altering uses of soils for landforms such as levees means that soils become less fertile and the natural succession is not present. Finally, the varying climates caused by humans can have effects on ecosystems. Global warming caused by humans, for example in the Savanna, causes unnatural occurrences. Global warming can cause extreme weather conditions such as higher temperatures or higher rainfall rates which mean that organisms do not grow as they have adapted to. The Savanna is a climax community which was once a thriving grassland, human activity nearby caused differing changes to temperatures and rainfall seasons which means that the grasslands of the Savanna cannot grow and cause unnatural seasons. In conclusion humans have varying impacts upon ecosystems which can often create climax communities. These range from farming issues such as pesticides and grazing to human disturbances such as in the rainforest including coppicing and shifting cultivation but no one human influence can change an ecosystem completely, it is a combination of many factors relate to humans. ...read more.

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