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contributor authorMatthews, Elaine
date accessioned2017-06-09T13:59:23Z
date available2017-06-09T13:59:23Z
date copyright1983/03/01
date issued1983
identifier issn0733-3021
identifier otherams-10464.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4145584
description abstractGlobal vegetation and land-use data bases (1° latitude by 1° longitude resolution), designed for use in studies of climate and climate change, were compiled in digital form drawing upon approximately 100 published sources complemented by a large collection of satellite imagery. The vegetation data were encoded using the UNESCO classification system; land-use data were encoded using a classification system developed by the author. The vegetation and land-use data were then integrated into a land-cover data base. Areal estimates for most ecosystems from the land-cover data base were found to be significantly different from areal estimates derived from two other global land-cover sources. Possible explanations for discrepancies among these data bases include differences in ecosystem definitions and source material used in compilation. From areal estimates of major ecosystems, derived from the new vegetation and land-cover data bases it is estimated that the total ecosystem reduction caused by agricultural activities amounts to 17.6 ? 106 km2 globally, with the greatest reduction occurring in non-tropical forests. Extensive subsistence agriculture which remains largely unreported in crop inventories accounts for 2.6 ? 106 km2 of this figure, with the balance of 15 ? 106 km2 agreeing encouragingly well with FAO's (1980) reported global crop area of 14.5 ? 106 km2. As an example of the flexibility of the new data base, areal estimates and brief definitions of selected ecosystem subdivisions are presented for the world and mapped for North America.
publisherAmerican Meteorological Society
titleGlobal Vegetation and Land Use: New High-Resolution Data Bases for Climate Studies
typeJournal Paper
journal volume22
journal issue3
journal titleJournal of Climate and Applied Meteorology
identifier doi10.1175/1520-0450(1983)022<0474:GVALUN>2.0.CO;2
journal fristpage474
journal lastpage487
treeJournal of Climate and Applied Meteorology:;1983:;volume( 022 ):;issue: 003
contenttypeFulltext


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