森林衰退现象种种８０年代，德国的山地出现了云杉、冷杉衰退现象，不久又蔓延到整个欧洲。接着美国和加拿大也发生了森林衰退现象。一般都认为酸雨是造成森林衰退的原因。这一见解很多报刊都作过报道。在日本，关东平原的寺庙林和宅旁林的柳杉也出现了衰退现象，也都认为... Deforestation In the 1980s, the decline of spruce and fir appeared in the mountains of Germany and soon spread to the whole of Europe. Then there was a forest recession in the United States and Canada. Acid rain is generally believed to be the cause of forest decline. Many newspapers have made this report. In Japan, the cedar forests in the Kanto Plain temples and by the shrine houses also witnessed a recession, and all think ...