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An Assessment of Trends in the Extent of Swidden in Southeast Asia

机译：东南亚受灾程度趋势评估

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Swidden systems consisting of temporarily cultivated land and associated fallows often do not appear on land use maps or in statistical records. This is partly due to the fact that swidden is a diverse and dynamic land use system that is difficult to map and partly because of the practice of grouping land covers associated with swidden systems into land use or land cover categories that are not self-evidently linked to swiddening. Additionally, in many parts of Southeast Asia swidden systems have changed or are in the process of changing into other land use systems. This paper assesses the extent of swidden on the basis of regional and national sources for nine countries, and determines the pattern of changes of swidden on the basis of 151 cases culled from 67 articles. Findings include (1) a majority of the cases document swidden being replaced by other forms of agriculture or by other livelihood systems; (2) in cases where swiddening is still practiced, fallow lengths are usually, but not always, shorter; and (3) shortened fallow length does not necessarily indicate a trend away from swidden since it is observed that short fallow swidden is sometimes maintained along with other more intensive farming practices and not completely abandoned. The paper concludes that there is a surprising lack of conclusive data on the extent of swidden in Southeast Asia. In order to remedy this, methods are reviewed that may lead to more precise future assessments.
机译：由临时耕地和相关休耕地组成的席卷系统通常不会出现在土地使用图或统计记录中。这部分是由于swidden是一个多样化且动态的土地利用系统，很难绘制地图，部分是由于将与swidden系统相关联的土地覆盖物归为不言而喻的土地使用或土地覆盖物类别的做法不知所措。此外，在东南亚的许多地区，湿地系统已经改变或正在转变为其他土地利用系统。本文根据9个国家的地区和国家资料评估了混血的程度，并根据从67篇文章中剔除的151例病例确定了混血的变化模式。调查结果包括：（1）大多数被废除的案件文件被其他形式的农业或其他生计系统所取代； （2）在仍在进行扫掠的情况下，休耕长度通常但并非总是较短； （3）休耕长度的缩短并不一定表明其趋向于远离耕种，因为观察到有时休耕和其他更密集的耕作方法会维持短暂的休耕，而并未被完全抛弃。该论文的结论是，关于东南亚的水灾程度，结论性数据令人惊讶地缺乏。为了解决这个问题，对可能导致未来更精确评估的方法进行了审查。

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