EVALUASI SUMBERDAYA LAHAN

Dr. Danang Sri Hadmoko, S.Si., M.Sc.

RUANG LINGKKUP KAJIAN

1. Definisi ESL Konsep/Faktor-faktor pembentuk

lahan Satuan Pemetaan Lahan (Landform

dan Land-Unit) Bentuk-bentuk pemanfaatan lahan

(faktor-faktor penentu pemanfaatan lahan

Metode Evaluasis SDL: Matching (Jenis, persyaratan dan

penerapan) Scoring (dasar penskoran, jenis analisis

parametrik)

RUANG LINGKKUP KAJIAN

Kemampuan Lahan Kesesuaian lahan untuk pertanian Kesesuaian lahan untuk non-

pertanian

Definition and Scope

Land evaluation is concerned with the assessment of land performance when used for specified purposes.

It involves the execution and interpretation of basic surveys of climate, soils, vegetation and other aspects of land in terms of the requirements of alternative forms of land use.

Scope and objectives of LE1. How is the land currently managed, and what will

happen if present practices remain unchanged?2. What improvements in management practices,

within the present use, are possible?3. What other uses of land are physically possible

and economically and socially relevant?4. Which of these uses offer possibilities of sustained

production or other benefits?5. What adverse effects, physical, economic or

social, are associated with each use?6. What recurrent inputs are necessary to bring

about the desired production and minimize the adverse effects?

7. What are the benefits of each form of use?

Steps of LE1. Recognition of a need for change;2. Identification of aims;3. Formulation of proposals, involving alternative forms

of land use, and recognition of their main requirements;

4. Recognition and delineation of the different types of land present in the area;

5. Comparison and evaluation of each type of land for the different uses;

6. Selection of a preferred use for each type of land;7. Project design, or other detailed analysis of a

selected set of8. Alternatives for distinct parts of the area - this, in

certain cases, may take the form of a feasibility study;

9. Decision to implement;10. Implementation;11. Monitoring of the operation.

Principles of LE

Land suitability is assessed and classified with respect to specified kinds of use.

Evaluation requires a comparison of the benefits obtained and the inputs needed on different types of land.

A multidisciplinary approach is required Evaluation is made in terms relevant to the

physical, economic and social context of the area concerned

Evaluation involves comparison of more than a single kind of use

What is land ?

Land comprises the physical environment, including climate, relief, soils, hydrology and vegetation, to the extent that these influence potential for landuse.

It includes the results of past and present human activity, e.g. Reclamation from the sea, vegetation clearance, and also adverse results, e.g. soil salinization.

Purely economic and social characteristics, however, are not included in the concept of land; these form part of the economic and social context.

MAPPING UNIT A land mapping unit is a mapped area of land with

specified characteristics. Land mapping units are defined and mapped by natural resource surveys, e.g. soil survey, forest inventory.

Their degree of homogeneity or of internal variation varies with the scale and intensity of the study.

In some cases a single land mapping unit may include two or more distinct types of land, with different suitabilities, e.g. a river flood plain, mapped as a single unit but known to contain both well-drained alluvial areas and swampy depressions.

Land characteristics, land qualities and diagnostic criteria A land characteristic is an attribute of land that

can be measured or estimated. Examples are slope angle, rainfall, soil texture, available water capacity, biomass of the vegetation, etc. Land mapping units, as determined by resource surveys, are normally described in terms of land characteristics.

If land characteristics are employed directly in evaluation, problems arise from the interaction between characteristics. For example, the hazard of soil erosion is determined not by slope angle alone but by the interaction between slope angle, slope length, permeability, soil structure, rainfall intensity and other characteristics.

Because of this problem of interaction, it is recommended that the comparison of land with land use should be carried out. in terms of land qualities.

LAND QUALITY

A land quality is a complex attribute of land which acts in a distinct manner in its influence on the suitability of land for a specific kind of use.

Land qualities may be expressed in a positive or negative way.

Land improvements

Land improvements are activities which cause beneficial changes in the qualities of the land itself. Land improvements should be distinguished from improvements in land use, i.e. changes in the use to which the land is put or modifications to management practices under a given use.