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水力发电与环境生态 被引量:20
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作者 左东启 《水利水电科技进展》 CSCD 北大核心 2005年第2期1-7,共7页
从2003年夏季到2004年冬季,从国际社会到国内学术界,掀起对水力发电工程的功能和价值表示怀疑的议论热潮.这是多元任务齐头并进、思想理论活跃的表现,也显露出认识实践的分歧和矛盾.本文仅就客观历史事实及基础知识概念进行简要阐述,内... 从2003年夏季到2004年冬季,从国际社会到国内学术界,掀起对水力发电工程的功能和价值表示怀疑的议论热潮.这是多元任务齐头并进、思想理论活跃的表现,也显露出认识实践的分歧和矛盾.本文仅就客观历史事实及基础知识概念进行简要阐述,内容除了涉及水能利用的可持续发展外,也涉及高坝大库的意义和广泛的水利建设.在学科领域方面,结合环境保护和生态系统,分析各方面的效益和缺陷. 展开更多
关键词 水力发电 再生自然资源 环境保护 传统系统生态学 广义生态观念
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Soil chemical properties under modern and traditional farming systems at Khagrachari,Chittagong Hill Tracts,Bangladesh
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作者 Shampa Biswas Mark E.Swanson +1 位作者 Jalal Uddin Md.Shoaib S.M.S.Sirajul 《Journal of Forestry Research》 SCIE CAS CSCD 2010年第4期451-456,523,共7页
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. Modem farming system in the Chittagong h... 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. Modem farming system in the Chittagong hill tracts like Sloping Agricultural Land Technology (SALT) is practiced to provide a new strategy for developing lands for economic productivity and bio-diversity conservation through establishment of ecological community rather than traditional shifting cultivation 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 modem 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. 展开更多
关键词 sloping agricultural land Technology sustainable hill farming system modem and traditional farming system chemical properties
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