10.Forest

              On the earth, we can see various plants, and one type of these is tree. I wrote herbaceous plants from 1 week to 9 week, but tree woody plant was not written.

              Woody plant is very deferent from herbaceous plant. It has tough trunk, a lot of blanch, spread its roots and grow up. Its trunk is similar to herbaceous plants when it is young. However it became bigger by it grow up. Almost it becomes to have leaves and buds. Its buds make flowers. It breeds almost by seeds. Its height is so long width. For example, a kind of eucalyptus in Australia is 130m. On the other hand, for instance, cowberry is very small tree. Its height is from 10cm to 40cm.

              The forest has various effects. In the first, it fosters many creatures and there is big good chain. In the second, there are made rich soil from fallen leaves and feces and corpse of creature. And, the roots of trees protect to flow out of this soil. In the third, trees and rich soil work as dam. They store rain water, and flow out water little by little. In the forth, forest absorb CO2 and emit O2 that is photosynthesis. The forest power is very important for the natural environment.

              Recently, deforestation is advanced various places. The forest is crowed many high trees. The half of land is occupied by the forest. So, deforestation is very big problem. First cause of deforestation is commercial logging by advanced nations. The developing nations is logged a lot of forests, and almost these trees use advanced nations. Second cause of deforestation is building up industrial park, farmland and resort.

              Japan is covered in one of the largest scale of forest all over the world. Japanese green space ratio is the second highest of advanced nations. However, Japan import the third most of the wood all over the world. In 1960s, Japan cut and imported this from Philippine. In 1970s, Japan did and did this from Indonesia. Recently, Japan import woods from Russia, Canada, America, Malaysia and China etc. Furthermore, for example, Malaysian forests are constantly decreasing in order to make vegetable oils and fruits which are to import.

              In conclusion, I think plant is very important for our life and animals lives. So, we have to protect plant. This problem is all people all over the world should think. The advanced nations specially must think this, and must make an effort to solve this.

http://www.chikyumura.org/environmental/earth_problem/deforestation.html

http://www.shinrin-ringyou.com/forest_world/menseki_gensyou.php