Opportunities and limitations for agroforestry systems in the highlands of North Thailand
1996
Thomas, D.E. (International Centre for Research in Agroforestry, Chiang Mai (Thailand))
This paper begins with a brief review of forces and processes underlying current transitions in the highlands, organized under six themes: 1) geo-politics and geo-economics; 2) population growth and migration; 3) agricultural commercialization, capitalization and opium crop substitution; 4) forest resource management, watershed protection and environmentalism; 5) urbanization, industrialization and tourism; and 6) adaptations in land use, society and culture. Projected major roles of the highlands in the future are discussed within two broad categories: 1) protective functions, including maintenance of watershed services, biodiversity, carbon stocks and esthetics; and 2) productive function, including agricultural production, forest product and tourism. Although many agroforestry systems potentially relevant to the highlands have been catalogued, there are two basic categories : 1) sequential systems, which include both traditional and modified types of swidden agriculture, as well as relay and transitional intercropping; and 2) simultaneous systems, which include both strip plantings or mixed planting. Contributions that agroforestry systems may be able to make toward improved sustainability, productivity, stability and equity in the highlands are discussed in terms of: 1) watershed regulation; 2) nutrient capture and retention; 3) biodiversity; 4) carbon sequestration; 5) household incomes; and, 6) equity. Six general factors that may facilitate or limit the use of agroforestry systems in the highlands are briefly reviewed: 1) Increased land pressure is already inducing transitions in land use patterns and adoption of agroforestry-related practices. 2) Variation in resource base characteristics, including both their capacity and current condition, can facilitate or limit adoption of agroforestry systems. 3) Access to roads, markets, inputs, capital, information and education can strongly influence adoption and development of agroforestry, as well as its opportunity costs; 4) The level of commercialization helps determine opportunity costs for agroforestry, selection of components and the direction of system development; 5) The strength of local organization and institutions can affect the viability of agroforestry, and is especially important in landscape-based systems; and, 6) The content, enforcement and perceptions of government policy can facilitate or limit adoption and development of agroforestry in the highlands, especially in terms of tenure, land use constraints, infrastructure and services.
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