Land—land resource

Land Evalution-land use-land use planning

Xie Jun-Qi Prof. China land Serveying and Planning Institute

Land

Land refer to a delineable area of the earth's terrestrial surface, encompassing all attributes of the biosphere immediately above or below this surface, including those of the near-surface climate, the soil and terrain forms, the surface hydrology (including shallow lakes, rivers, marshes and swamps), the near-surface sedimentary layers and associated groundwater and geohydrological reserve, the plant and animal populations, the human settlement pattern and physical results of past and present human activity (terracing, water storage or drainage structures, roads, buildings, etc.) (FAO/UNEP, 1997)

Functions of Land

• （ The Future of Our Land, FAO/UNEP,1999 ）

• a store of wealth for individuals, groups, or a community

• production of food, fibre, fuel or other biotic materials for human use

• provision of biological habitats for plants, animals and micro-organisms

• co-determinant in the global energy balance and the global hydrological cycle, which provides both a source and a sink for greenhouse gases

• regulation of the storage and flow of surface water and groundwater

• storehouse of minerals and raw materials for human use

• a buffer, filter or modifier for chemical pollutants

• provision of physical space for settlements, industry and recreation

• storage and protection of evidence from the historical or pre-historical record (fossils, evidence of past climates, archaeological remains, etc.)

• enabling or hampering movement of animals, plants and people between one area and another 。

Characteristic

• Fixed location• Limited area• Suitable and limited• Change of Land quality ,land cover and land use

• Economic ,social and environmental influence

Land Resource

• Land Resource: can be used land under technology in present or future

• Land use means to utilize the different functions including production, ecology and space etc.

• From this point, almost all the land can be regarded land resource

• Rational land use is based on scientific land evaluation and land use planning.

Land Evaluation (Assessment)

• Land evaluation is the process of assessment of land performance when used for specific purposes

• The major is the evaluation for land quality

• Aim: rational land use

Land evaluation

• Requirement of land evaluation ： suitable, restricted, productivity , land value

Suitability :

analyze the natural , social and economic environment of land.

Restricted degree

diagnosing technology for land quality

Capability

based on bioscience and economics

Value :

economic assessment, including analysis , forcasting of market. and so on .

Type of land evaluation

• Land suitability evaluation ： suitability : high ,medium and low not suitable : not suitable in present, not

suitable forever

• Land capability evaluation ： eight classification

• Land economic assessment ： land grade and value

Major type of land evaluation

• Land suitability evaluation serve for economic development and land use

planning • Land capability evaluation serve for making macro policy • Land ecologic and economic evaluation serve for land ecological safety, such as

ecological environment and economic effect. • Sustainable land use evalution to evaluate sustainability of land use system for

sustainable development.

Land Quality

a land quality (or limitation) is a complex attribute of land which acts in a manner

• distinct from the actions of other land qualities in its influence on the suitability of land

• for a specified kind of use.• A listing of the various land qualities in relation to crop growth, animal

production, forest productivity and inputs/management levels is already given in the Framework for Land Evaluation of 1976

• Another listing, related to the vertical components of a natural land unit, is given in FAO(1995), （ 5 types and 33 factors ）：

• ATMOSPHERIC QUALITIES• Atmospheric moisture supply: rainfall, length of growing

season, evaporation, dew formation.• Atmospheric energy for photosynthesis: temperature,

daylength, sunshine conditions.• Atmospheric conditions for crop ripening, harvesting and

land preparation: occurrence of dry spells.

Land Quality

• LAND COVER QUALITIES– Value of the standing vegetation as "crop", such as timber.– Value of the standing vegetation as germ plasm: biodiversity value.– Value of the standing vegetation as protection against degradation of soils and catchment.– Value of the standing vegetation as regulator of local and regional climatic conditions.– Regeneration capacity of the vegetation after complete removal.– Value of the standing vegetation as shelter for crops and cattle against adverse atmospheric

influences.– Hindrance of vegetation at introduction of crops and pastures: the land "development" costs.– Incidence of above-ground pests and vectors of diseases: health risks of humans and animals.

• LAND SURFACE AND TERRAIN QUALITIES– Surface receptivity as seedbed: the tilth condition.– Surface treatability: the bearing capacity for cattle, machinery, etc.– Surface limitations for the use of implements (stoniness, stickiness, etc.): the arability.– Spatial regularity of soil and terrain pattern, determining size and shape of fields with a

capacity for uniform– management.– Surface liability to deformation: the occurrence or hazard of wind and water erosion.– Accessibility of the land: the degree of remoteness from means of transport.– The presence of open freshwater bodies for use by humans, animals or fisheries.– Surface water storage capacity of the terrain: the presence or potential of ponds, on-farm

reservoirs, bunds, etc.– Surface propensity to yield run-off water, for local water harvesting or downstream water

supply.– Accumulation position of the land: degree of fertility renewal or crop damaging by overflow

or overblow.

Land Quality

• SOIL QUALITIES– Physical soil fertility: the net moisture storage capacity in the rootable zone.– Physical soil toxicity: the presence or hazard of waterlogging in the rootable zone

(i.e. the absence of oxygen).– Chemical soil fertility: the availability of plant nutrients.– Chemical soil toxicity: salinity or salinization hazard; excess of exchangeable

sodium.– Biological soil fertility: the N-fixation capacity of the soil biomass; and its

capacity for soil organic matter turnover.– Biological soil toxicity: the presence or hazard of soil-borne pests and diseases.– Substratum (and soil profile) as source of construction materials.– Substratum (and soil profile) as source of minerals.– Biological soil toxicity: the presence or hazard of soil-borne pests and diseases.

• SUBSTRATUM OR UNDERGROUND QUALITIES– Groundwater level and quality in relation to (irrigated) land use.– Substratum potential for water storage (local use) and conductance (downstream

use).– Presence of unconfined freshwater aquifers.– Substratum (and soil profile) suitability for foundation works (buildings, roads,

canals, etc.)

Land evaluation in Chian

1949---1980 special land evaluation such as latex ,orange etc.

1980—2000

learn land evaluation approach from FAO and the other country, such as AEZ , etc

After 2000

land assessment for agricultural land and construction land in city for land use management and administration.

Base on P-S-R frame, land quality

indicator system is researched

specially for soil erosion,

The aim is to explore the

relation or soil erosion and land

quality ,and bring land use pattern

indicator into indicator system,

which set up the base for

researching the relation of

landscape pattern and procession.

Sustainable Land Management

• "Sustainable land management combines technologies, policies and activities aimed at integrating socio-economic principles with environmental concerns so as to simultaneously:

• - maintain or enhance production/services (Productivity)

• - reduce the level of production risk (Security)• - protect the potential of natural resources and

prevent degradation of soil and water quality (Protection)

• - be economically viable (Viability)• - and socially acceptable (Acceptability)."

Land Use Planning

Land-use planning is the systematic

assessment of land and water potential,

alternatives for land use and economic and

social conditions in order to select and

adopt the best land-use options. .（ UN ， 1993 ）

Why land use planning is needed?

• Its purpose is to select and put into practice those land uses that will best meet the needs of the people while safeguarding resources for the future.

• Land unit is muti-suitable

• Different land use is controdicted.

• Land use can be controlled

Goals

Goals may be grouped under the three headings of efficiency, equity and acceptability and sustainability.

• Efficiency. • Land use must be economically viable, so one goal of development

planning is to make efficient and productive use of the land. For any particular land use, certain areas are better suited than others. Efficiency is achieved by matching different land uses with the areas that will yield the greatest benefits at the least cost.

• Equity and acceptability.• Land use must also be socially acceptable. Goals include food security,

employment and security of income in rural areas. Land improvements and redistribution of land may be undertaken to reduce inequality or, alternatively, to attack absolute poverty.

• Sustainability. • Sustainable land use is that which meets the needs of the present while, at

the same time, conserving resources for future generations. This requires a combination of production and conservation: the production of the goods needed by people now, combined with the conservation of the natural resources on which that production depends so as to ensure continued production in the future

Land use planning ---National level

• National land use planning outline

Implementing national goal and national strategy

Land use strategic goal and strategic importance.

Making and dividing land use indicator for

controlling.

Arrange land for key infrastructure and project

Put out regional land use policy

Put out measures for implementing land use

planning

Land use planning ---Province level

strategy carry out indicator for controlling by higher

level

harmonize with relative planning

arrange land for key infrastructure and

project

make land use division

put out measures of implementing planning

Land use planning---municipality level

control

carry out indicator for controlling by higher level

harmonize with relative planning

arrange land for key infrastructure and project

make land use division

put out measures of implementing planning

Land use planning – country level

implementation carry out indicator for controlling by higher

level

harmonize with relative planning

arrange land for key infrastructure and project

make land use zoning

put out measures of implementing planning

Land use planning --Town （ local level ）

土地用途分区研究

Thank you !