National park and forest in the United States of America(<SPECIAL EDITION Part 1>Forest resources as our global environment)

Abstract

In this report, I considered the relationship between environmental resources of the Earth and forest stands from the data of national parks in U.S.A. The results are summarized as follows. At first, every states have another weather and natural vegitation, because of extensiveness of the U.S.A., so we have to consider the regional factors. The environmental resources includes the geographical factors, forest stands and the vagetation. The national parks are classified such three types. They are the present condition conservation type, transition observation type and anothers. And all types of environmental resources have anather time scales. Each national park have many time scales. At the biginning, the purpose of the national park was only resort resource, but in recent years, the purposes are the studing fields of nature conservation. At now, artificial environmental destructions are grave influences. I think that the future mission of the national park is the information field of environmental destructions.