JAPAN Draft 2
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???1????????????????????? 240 ????????????? ( ?
? goo ?? ) ? 1977 ????????????????????????????????
?????? 1989 ???????????????????????????????
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Soil erosion is influence of wind and inclination chiefly.The soil on the surface collapses,
Finally, the layer of the rock of the lower layer becomes baring.So crops do not grow up.
In reality,the leaf and the branch of the forest isn't applied the raindrop that has fallen from the sky to the soil. In addition in putting the root on ground,to prevent the soil from flowing out at once even about the rush of rain. But the advanced countries imports the forest. In addition,the developing countries is increasing the population so the residential quarter is developed, and the jungle land cleared by burning is done haphazardly for food securing.For these reasons, the number of forests decreases. In a word,a necessary forests are lost by human's selfish behavior.
Therefore,the possibility that the flood occurs rises even the light rain.After that,the soil erosion occurs. Finally,crops do not grow up.
Now,amount of soil is lost 24 billion tons only one year.(by Environment goo)
In 1977 and 1989,accidents happened by soil erosion,so deforestation was prohibited.
There are some masures for soil erosion.One of them,to urge rifraining forest import to advanced countries.
The another one,to understand importance of forest and danger of unplanned deforestation.
« An example of soil erosion »
! Now, about 6000000ha land is extingui shed every year by desertification.
In the forest, the soil is supported by a spring tree and plant roots. It is not to spill on the rain and the soil. Also, plant trees and also it is based on its soil.
Leaves and trees, the humus layer of soil is decomposed by microorganisms come along ananodend fallen branches and stem blight. Humus to the soil are many and include ammonia, the plant it is building an ecosystem that can continue to grow. Humus to the soil are many and include ammonia,
the plant it is building an ecosystem that can continue to grow.
So, it reduces the soil humus by deforestation continues, it will be to degrade the water retention capacity of the earth. This decrease in water retention capacity is also the most important issues of deforestation.
Written by Ai Yoshitomi/Yuko Yoshida/Yuka Tokunaga/Shino Kato