金沙江干热河谷植被恢复技术及生态效应--以云南小江流域为例

金沙江干热河谷滑坡、泥石流等山地灾害强烈，水土流失严重，生态环境十分脆弱。以小江流域干热河谷为研究区，根据立地条件和植物的生物学特性，提出了7类治理措施，并通过人工降雨试验，应用对比研究方法对植被的生态效应进行分析。结果表明：植被延缓雨水汇集、截流拦沙、增强土壤入渗等生态功能效应显著；裸地、稀树草丛地、灌草地分别在人工降雨31，34，75min后开始产流，在61，79，150min后产流趋于稳定，稳定产流率分别为6．20，3．04，0．64L／min．径流平均含沙量分别为6．8，4．2，2．0g／L。

Vegetation Rehabilitation Techniques and Ecological Effects in Dry-Hot Valley of Jinsha River-Case study in Xiaojiang Basin, Yannan Province

The ecological environment of dry-hot valley in Jinsha River, where landslide and debris flow mountainhazards have frequently occurred, and with heavy soil and water loss, is very fragile. In this paper, the vegetationrehabilitation techniques and ecological effects in the Xiaojiang Basin are studied. Based on different site conditionsand plants biological characteristics, seven rehabilitation measures are set up in the dry-hot valley. The results ofecological effects, which are studied by artificial rainfall and contrasting method, indicated that: the vegetation e-cological effects are very good in staying water and soil and improving soil infiltration function. In bare land, baretrees and herbs land, shrubs and herbs land, the time of bringing surface runoff is 31, 34, 75 min after artificialrainfall respectively, and the time of stable surface runoff ratio is 61, 79, 150 min respectively. The ration of stablerunoff is 6. 20, 3. 04, 0. 64 L/ min respectively. The average ratio of sediment is 6. 8, 4. 2, 2. 0 g/L respectively.