02 Contents Frame
ii. Diagnosis of land use problems
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40 2019 ND-CP 413905
| ii. Diagnosis of land use problems
Path P, leading to the box ‘diagnosis of land use problems’, should be taken where it is known that existing land use systems in an area are facing problems, which is likely in many land evaluation exercises, and where one of the objectives of the evaluation is to assist in solving these. Examples are declining soil fertility, overgrazing, fuelwood shortage. There is an input of information on land units (Path N) and from the stakeholders (Path P). Diagnosis is an important stage in the land evaluation. It has an effect on the information needed for social analysis (Path S). iii. The identification of kinds of land use (land utilization types) The identification and description of the kinds of land use to be considered is an essential part of the evaluation procedure. Some restrictions to the range of uses relevant for consideration will have been set by the objectives and assumptions. Three situations may be distinguished: Chapter 4 – Revised principles and procedures 35 ¾The kinds of land use are specified at the beginning of the evaluation procedure (land utilization type descriptions as in the original Framework; see Glossary). ¾The information derived from the diagnostic analysis (Path Q) may be used for the formulation of existing land utilization types, and procedures derived from the design stage may be used as one means for the formulation of improved land utilization types. ¾The kinds of land use are broadly described at the beginning and subject to modification and adjustment in accordance with the findings of the evaluation procedure. iv. Land use requirements, functions and limitations When the land use is known, the related requirements, expected functions and limitations need to be defined (see Chapter 3 for discussion on the functions and limitations). Land use requirements play a major role in land evaluation procedures, at an early stage guiding what properties of the land should be ascertained, and at a later, key, stage, determining suitability when they are compared with these properties. Where functions of the land other than biomass production are being assessed, such as carbon sequestration or stabilized outflow from catchment areas, a point that requires further consideration is whether the suitability for these functions (related to environment, settlement, economy) can be formulated in terms of requirements –preferably quantitative–, or whether a different approach to the estimation of suitability for such functions would be more practical. tải về 0.57 Mb. Chia sẻ với bạn bè của bạn:
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