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Book (stand-alone)FRA 2000 - Comparison of forest area and forest area change estimates derived from FRA 1990 and FRA 2000 2000
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No results found.The working paper compares the 1990 net forest areas and the figures for net annual forest area change derived from FRA 1990 and FRA 2000. The total 1990 forest area registered by FRA 2000 was found to be 521 million ha or 15.1% larger than the corresponding figure from FRA 1990. This difference owes primarily to change of definitions of forest between the assessments (in particular the lowering of the threshold value for crown density in the industrialized countries from 20 to 10%). The change of forest definitions had the largest impact on the reported forest areas for Australia and the Former USSR. Due to the above, a larger forest area was studied in FRA 2000 compared to FRA 1990. Despite that, the net annual forest area change during the 1990's reported for FRA 2000 was - 9.4 million ha, representing a positive development from the FRA 1990 estimate of - 13.1 million ha during the 1980's. The rate of net forest area loss as reported by FRA has thereby decreased by 3.7 million ha f rom the 1980's to the 1990s. If the FRA 1990 definitions are applied to the data for the 1990s, the slowing net deforestation trend at the global level is further enhanced. -
Book (stand-alone)FRA 2000 annotated bibliography forest cover change - Belize 2000
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No results found.The world's forests are changing in quantity and quality, in both positive and negative ways. This process is associated with social, economic and environmental factors. These factors are not always presented in a comprehensive way, based on all available information, and free of preconceived ideas or biases. What are the factors that motivate people to plant or cut trees and forests (human driving forces)? What are the natural phenomena that affect forest cover (natural driving forces)? Forest Resources Assessment 2000 (FRA 2000), a priority programme within the FAO Forestry Department, is executed at the request of all FAO member countries. FRA 2000 is based on country-level information from national inventories, research projects, national consultations and various studies that provide information on forest cover, volume and change over time. With the assistance of the Tropical Agricultural Research and Higher Education Center (CATIE) of Costa Rica, FRA 2000 carried out a literature review of positive as well as negative changes in the forest cover of Mesoamerica, Venezuela, Colombia and Ecuador. The present paper presents the results for Belize. They were produced with the cooperation of national and international institutions, which supplied the best available information with respect to the principal factors, situations and processes that have an impact on the change of forest cover and land use (cutting of trees, reforestation, afforestation and degradation). -
Book (stand-alone)FRA 2000 - On sampling for estimating global tropical deforestation 2002
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No results found.The Global Forest Resources Assessment 2000 (FRA 2000) included a remote sensing survey of tropical forest area changes. The survey studied the period 1980-2000 using a time series of three points. Time and resources available made it necessary to sample the studied area. Considerable effort was made to ensure that the sample was representative for the tropics as a whole, yet affordable for the survey project (FAO 2001). Predictably, the findings of FRA 2000 were given high attention in media, a nd widely commented by organisations active in the forestry field. This paper is a response to criticism raised by Tucker & Townsend (2000) who challenged the statistical design of the FRA 2000 remote sensing survey and claimed that a 10% area sample is not sufficient to capture the spatial variation of forest cover changes and that an 80% area sample would be required, using a much larger number of satellite images. Since this figure was later quoted by Matthews (2001) and Stokstad (2001) and t hus given wide publicity, it is relevant to present the current analysis that addresses some underlying assumptions and findings in the Tucker & Townsend (2000) study. The paper has been prepared by Ray Czaplewski who was involved in the design of the FRA 2000 remote sensing survey.
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