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ARTICLES
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swidden fallow management..
widden farming (“or slash-and-burn” or “shifting cultivation”)
was an excellent form of agriculture for Vietnam’s uplands when population density was low and forest cover was high; today it is clearly unsustainable, ill-suited for the current socioeconomic and environmental conditions of the mountainous regions. Growing population pressure
in the uplands, along with the reduction of forest cover, have gradually reduced fallow periods from 15-20 years to only 4-5 years. Loss of forest ...
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Cares Articles
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Assessing Forest Cover in the Uplands of Southeast Asia
Remote sensing data and digital image processing is widespread being used to map tropical rainforest and its changes. The purposes differ from global and regional assessment of forest cover in a global change context to local needs for natural resource planning support. While good accuracies can be obtained using the right methodology (overall accuracy superior of 90 %) for a limited area, the broad worldwide or regional maps may work at the large scale, but will inevitably have a bias at the local scale. Despite these shortcomings, these latter forest classifications are more and more being used as planning support because of their extended coverage and readily availability. The present paper assesses the pertinence of using broad global classifications in a local context in mountain forests in the Ca river basin in northern Vietnam. In order to understand the land-cover and the production system, field studies were conducted and it appeared that there was no or insignificant on-going clear-cutting of the remaining forest and shifting cultivation was important in the area. Settlements varied much in size from less than a hectare to over 10 hectares and the fields were cultivated from one to three years at the time, leaving the soil fallow for a period of a few years up to 20 years. Four broad land cover classifications available for the Ca river basin were compared to determine how well they characterized the land-cover and the production system found. The three broad classification schemes, Pathfinder (Tropical Rainforest Information Center, 1998), FAO (FAO, 2001) and Tropical Ecosystem Environment Observation by Satellite (TREES, 2001) where compared to Tottrup’s verified land-cover maps derived from multi-date classification of Landsat ETM data (Tottrup 2002). It was shown that the broad classifications over- and underestimated the forest area with a magnitude in difference and hereby fail to capture the important balance between the agricultural system and the forest. Specifically land-cover classes associated to the exploitation of the forest, the degraded forest, bamboo, shrub, grass and farmland are not allocated consistently to either forest or non-forest. These classes are of primary relevance to local forest management and it is concluded that broad classifications should not be used in a local context without previous verification. The paper includes discussion on how lack of understanding of the production system affects the classification result and equally how unintentional selections of remote sensing data from different periods can have a significant influence on the classification result. It is concluded that using multi-date classifications of Landsat or equivalent high-resolution data provide the necessary high quality information to characterize the forest dynamic.
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Factors Influencing Farmers' Adoption of Agro-forestry
in the North Mountainous Region in Vietnam. Case study in Seo village, Tan Minh commume, Da Bac district, Hoa Binh province
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