【摘 要】
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With the classification data covering American land-use/land-cover (LUCC) with 30 mresolution from the project of National Land Cover Data (NLCD), we normalized
【机 构】
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Inst. of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
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With the classification data covering American land-use/land-cover (LUCC) with 30 mresolution from the project of National Land Cover Data (NLCD), we normalized them and madetheir resolution changed into 1 km × 1 km, created the data of American land-use grade and analyzedthe spatial distribution and features of American LUCC as well as the influence of population andaltitude on the land-use grade in light of methods of sampling analysis and correlation study. Basedon the analysis, we concluded that forestry and grassland, accounting for 71.24% of the wholecountry, has taken the main part of American land cover, and besides, construction and arable landhas occupied 19.22% of the total land, the rest of land cover types, including water area, wetlandand underdeveloped land, is 9.54% of the countrys total. The developing potential of American landresources is enormous with less destroyed and disturbed ecological environment. Although, in somesense, the population and altitude influence the spatial variation of American land-use graderespectively, the influence of spatial variation of altitude and population density on that of land-usegrade is not significanct.
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