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星期六, 十一月 19, 2005


2005年11月17日 09:52

凤凰卫视11月17日消息 据海外媒体报道,据联合国最新报告显示,中国广泛开展的植树造林运动大大地降低了地球森林面积消失的速度,但是全球范围内热带森林的数量仍然呈减少的趋势。







报告指出,在10年内,亚洲在森林面积增长方面起色很大:在20世纪90年代,亚洲大约有3000平方英里的森林消失,但至2000年以来,共增加了约 4000平方英里的森林土地。但是,这一地区情况的改善应主要归功于中国新的森林政策,而亚洲其他地区的热带森林面积仍然在急速减少。





China Is Bright Spot in Dark Report on the World's Diminishing Forests


Published: November 15, 2005

Widespread tree planting in China has slowed the rate at which the earth's forested area is dwindling, but the clearing of tropical forests, much of it in areas never previously cut, continues to grow, according to a new United Nations report.

The study was published yesterday by the United Nations Food and Agriculture Organization, based in Rome, and is online at fao.org/forestry.

"While good progress is being made in many places, unfortunately forest resources are still being lost or degraded at an alarmingly high rate," said Hosny El-Lakany, assistant director-general of forestry for the food and agriculture agency.

The slowing rate of forest loss is encouraging, some forest experts say, but biologists contend that most acreage gained by plantation forestry contains a fraction of the plant and animal diversity destroyed with virgin forests. Forest cover has generally been expanding in North America, Europe and China and diminishing in the tropics.

The report said that worldwide just over 50,000 square miles of forest - an area a bit smaller than New York State - had been cleared or logged annually since 2000. Nearly half of that annual loss affected tracts with no evidence of previous significant human use, the report said.

In the report, which compared forest trends over the last five years with those through the 1990's, South America passed Africa in net annual loss of forests (the difference between areas added as plantations and lost through cutting or burning).

Much recent clearing in South America has occurred in the southern Amazon basin, where jungle is rapidly being converted to pasture and farmland, especially soybean fields, the report said.

Asia has seen an extraordinary turnaround in a decade: it lost about 3,000 square miles of forest a year in the 90's but gained nearly 4,000 annually since 2000, said Mette Loyche Wilkie of the F.A.O. But almost all of that change has occurred because of China's new forest policy, she said. Tropical forests elsewhere in Asia are still being cleared at a rising pace, the report said.

Several independent forest experts said the study was a valuable rough estimate of global trends, but cautioned that it was generated using data provided by countries with widely varying track records in monitoring deforestation.

"The F.A.O. is doing the best it can given what the governments are providing," said Mila Alvarez, who tracks forest trends for World Resources Institute and Global Forest Watch (globalforestwatch.org). She said they and other groups were preparing to develop a way to use satellite imagery to analyze forest changes and to verify government estimates.


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