02 Contents Frame
ORIGIN AND NATURE OF THE FRAMEWORK
tải về 0.57 Mb. Chế độ xem pdf
|
40 2019 ND-CP 413905
| ORIGIN AND NATURE OF THE FRAMEWORK
Origin Land evaluation originated from the need for a comprehensive assessment of land performance when used for different specified purposes. By 1970 many countries had developed their own systems of land evaluation. This made exchange of information difficult, and there was a clear need for international discussion to achieve some form of standardization. Two committees prepared a background document (FAO 1972), which was discussed together with papers describing land classification systems throughout the world (FAO 1974) at a meeting of international experts (Brinkman and Smyth 1973). The next stage was the writing of the first draft of the Framework (FAO 1973), which was discussed in a second expert meeting (FAO 1975). The insights gained during this consultative process are reflected in the final version of the Framework for land evaluation (FAO 1976). The interpretation went beyond that of soil surveys to include climate, vegetation and other aspects of land in terms of the requirements of alternative forms of land use. The Framework formulated six principles of land evaluation and set out concepts, methods and procedures for a systematic biophysical and socio-economic assessment of the potentials for specific land uses likely to be relevant to the area. It provided detail on which factors or land qualities should be considered in the evaluation for different kinds of land uses and how to evaluate these qualities. For purposes of supra-national classification of potential productivity, climate and land resources were combined into agro-ecological zones (FAO 1978a, 1978b, 1980, 1981). Socio-economic aspects were also dealt with in subsequent guidelines on land evaluation for rainfed agriculture (FAO 1983), forestry (FAO 1984), irrigated agriculture (FAO 1985) and extensive grazing (FAO 1991), and for the special conditions of steep lands (Siderius 1986). tải về 0.57 Mb. Chia sẻ với bạn bè của bạn:
|