Cover Image
close this bookObstacles to Tree Planting in Arid and Semi-Arid lands: Comparative Case Studies from India and Kenya (UNU, 1982, 63 p.)
View the documentAcknowledgements
View the documentSummary and conclusions
close this folder1. Introduction and purpose of the study
View the documentThe United Nations University programme
View the documentObjective of the study
View the documentChoice of study areas
View the documentDefinitions and distribution of arid and semi-arid lands
View the documentBenefits of trees-the "4-E Package"
View the documentRecent trends in forestry
close this folder2. India
View the documentForestry policy, strategy, and organization
View the documentSelection of the study area
View the documentResources and needs for forest products and services
View the documentOvercoming the major obstacles to tree planting
View the documentThe Gujarat community forestry project
close this folder3. Kenya
View the documentLand Tenure and use
View the documentDefinition and distribution of the arid and semi-arid zones
View the documentGovernment policy on arid zone development
View the documentForestry organization and policy
View the documentRural afforestation and extension
View the documentNeeds for forest products and services in the arid zone
View the documentCurrent programmes of afforestation in the arid zone
View the documentOvercoming the major obstacles to tree planting
close this folder4. India and Kenya: Comparisons and contrasts
View the document(introduction...)
View the documentEnvironmental and technical factors
View the documentInstitutional factors
View the documentSocial and economic factors
View the documentAppendix 1. Outline of a four-week training course in community forestry and extension at the commonwealth forestry institute Oxford
View the documentAppendix 2. Proposal for a 35-hour course in agro-forestry for agricultural students (third-year degree)
View the documentAppendix 3. Summer courses at the commonwealth forestry institute, Oxford
View the documentReferences
View the documentOther UNU publications

Definition and distribution of the arid and semi-arid zones

As stated, for the purpose of this report an exact definition of aridity is unnecessary, and the areas principally considered are those recognized as arid (350-500 mm annual rainfall) and very arid (200-350 mm) by the Government of Kenya (1979), although some of the discussion refers equally to semiarid areas (500-800 mm). The 500 mm isohyet is shown in figure 2 (page 3), the total area receiving less than 500 mm rainfall being 379,000 kmē.