论文部分内容阅读
由于森林覆盖面积的缩减,制度上的缺陷,人口增加和不合理的山区农业系统等因素,吉大港山区植被严重退化.rn孟加拉吉大港山区正在实践现代农业体系(如坡地农垦技术),它通过建立生态群落(而非传统轮垦)提高经济产量和生物多样性,这种现代农业体系提供了一种新土地开发策略.本研究对孟加拉吉大港山区Khagrachari的现代和传统农业体系中的土壤化学性质变化进行对比分析.与传统轮耕相比,实行坡地农业耕地技术的土地有较高的生产容量,含有较高的有机碳和有机物.在吉大港山区,通过发展综合农业生态系统建立稳定的生产环境.可以将轮作耕地变为相对稳定的半永久性的农业系统.“,”Land degradation in Chittagong hill tracts has been taking place due to shrinkage of forest cover, policy weakness, population explosion, and inappropriate hill farming system. Modern farming sys-tem in the Chittagong hill tracts like Sloping Agricultural Land Technol-ogy (SALT) is practiced to provide a new strategy for developing lands for economic productivity and bio-diversity conservation through estab-lishment of ecological community rather than traditional shifting cultiva-tion which is no longer sustainable according to the carrying capacity of ecosystem of Chittagong hill tracts. This study is to find out changing trends of soil chemical properties of sites under modern and traditional farming systems at Khagrachari district of Chittagong hill tracts. The result of the research shows that Sloping Agricultural Land Technology has significantly higher capacity of production due to the presence of the highest percentage of organic carbon, organic matter, compared with shifting cultivated site. The study recommends that shifting cultivation may be changed into a relatively stable semi-permanent farming system through developing participatory integrated farming systems to establish stable production environment in the Chittagong Hill Tracts.