摘要
干热河谷主要分布于长江、珠江、澜沧江、红河和怒江等国内和国际性河流的上游深切河谷地段.由于地质结构不稳定,土层浅薄、人口膨胀导致过度耕种,尤其长达半年的旱季等因素使该地区的生态环境处于极端的脆弱阶段.当地的原始植被为常绿阔叶林和落叶阔叶林,但均遭到严重的破坏.现有植被为次生的稀树草坡和肉质化刺灌木.目前已经开展了一系列的有关造林技术的前期研究项目,但大规模的造林培育工程尚难以开展.
Dry- hot valleys（DHV） are mainly located in the deeply incised valleys along the upper streams of some national and international rivers, such as the Yangtz River, the Pear River, the Lancangjiang（Mekong） River, and the Red River etc. Because of the unstable geological texture, shallow soil, and a half - year long dry period with little rainfall, the ecological environment in DHV areas is quite vulnerable. Moreover, the ecological environment in these areas has been severely influenced by over fanning due to population expansion, and it has become extremely fragile. The primary vegetation in the local area of dry - hot valleys used to be evergreen broad - leaved forests and deciduous broad -leaved forests, which had been denuded in the history. The current local vegetation is mainly the degraded secondary vegetation composed of savanna styled grassland and succulent thorny shrubs. A series of pilot research projects demonstrating new silviculture techniques for vegetation restoration in DHV areas have been implemented. However, it is still hard to carry out large scaled afforestation programs in DHV areas.
出处
《西南林学院学报》
2005年第4期52-55,共4页
Journal of Southwest Forestry College
基金
昆明市科技计划资助项目[昆科(农)字200201007]
关键词
干旱河谷
干热河谷
植被恢复
dry valley
dry - hot valley
vegetation restoration
