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Word Count: 530
Land degradation is a decline in the quality of land There are several major types of land degradation in Australia Some of which are listed below Soil erosion occurs when large numbers of trees are removed from a small area Normally soil is held together by tree roots However when these trees are removed there is nothing to hold the soil together so when the wind blows the rich fertile topsoil is easily blown away Once this has occurred crops planted on this land are of lesser quality and quantity as there are less nutrients present in the soil Sometimes this problem is so severe that crops can not be planted at all This is a big problem to farmers as their profits are greatly reduced The only solution is to plant trees with strong roots in an effort to hold the soil together to prevent further damage and years later to try to replant crops The only way that we can resolve soil erosion is by leaving trees in a small area as is and cutting down trees in big areas where trees arent really needed If we can do this Soil erosion will hopefully be kept to a minimum and farmers would be able to make more profit and provide us with food Soil salinity is another problem related to the removal of trees Underneath the soil is a layer of water called the water table Normally the level of this stays constant as any rain is absorbed by the trees However when these trees are removed rainfall causes the water table to rise bringing with it dissolved salts from rocks deep under the earth The water then becomes salty As salty water cannot be absorbed by plants the plant runs out of water so its leaves fall off Without these leaves photosynthesis can not occur so the plants die This is called dieback This can only be helped by planting one
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