Deforestation in Southeast Asia
Saturday, May 22nd, 2010Agriculture, which is the main source of cereals, industrial materials, job opportunities and foreign exchanges, plays an important role in Southeast countries. They have made great achievement in agriculture but large areas of forest have been destroyed. In order to enlarge the area of crops, nearly all southeast countries hew down trees and destroy forest.
Since the Second World War, arable land in all Southeast countries has increased. Though the population has become lager, arable land per capita doesn’t decrease and it even increases in some countries. From the year 1980 to 1996, population in Cambodia increased from 6.4 million to 10.27 million and arable land per capita was up to 0.37 ha from 0.3 ha. The arable land per capita increased to 0.09 ha from 0.07 ha in Malaysia when the population increased from 13.76 million to 21.17 million. Philippine mainly developed agriculture by destroying forest before 1970s and in 1950s, arable land increased by 3.45% on average. In 1960s, the increase was 1.3%. Even Philippine tried to develop agriculture by destroying forest; they still couldn’t get great success because of the low productivity. Thailand also had the same mistake. Arable land increased from 41.4 million ha to 93.245 ha from the year 1950 to 1982 with the rate of 12.3% of national land to 29%. In 1990, arable land increased by 47.4%. Meanwhile, forest area decreased by 37.2% from the year 1951 to 1995.
Forest is a kind of renewable resource but the growth cycle needs some decades or even more than a hundred years. So the speed of growth is far behind that of human destroying. In fact, those countries have been punished by the results of deforestation. Soil has been washed away because of lack of protection from forest. Sediment deposition imposed bad effects on transportation and hydropower so people often can not get enough and stable electricity. Deforestation results in flood, drought and other natural disasters. Cambodia, located in the lower reaches of Mekong River, often suffers from flood if the rainfall is too much. At the end of 2000, terrible flood occurred in the country with 400 people lost and more than 1 billion dollars loss. In 2001, more than 108 people in Vietnam died from flood and the number of homeless people was more than 60,000. Forest decrease has reduced land fertility. In 1980s, 18 million ha land suffered from salinization in northeast part of Thailand and 260 ha land in south part suffered from salinization or acidification. Such phenomenon can be found in other Asian countries. Deforestation, at the same time, has destroyed biodiversity. Tropical rain forest, mangroves, wetlands and animals are on the brink of annihilation. In 1997, endangered birds take 11% in Indonesia, 24% in Philippine, 10% in Vietnam and 9% in Malaysia and Thailand.
In recent years, deforestation has decreased compared with that of before because most countries have realized the terrible result caused by deforestation. In addition, technology development also provides ways to improve productivity. However, deforestation still exists in the world and we have more work to do.

