摘要
一江两河(雅鲁藏布江、拉萨河、年楚河)中部流域是西藏自治区的政治、经济和文化中心.由于自然环境的脆弱性和当地人们对土地的过度利用,沙漠化正成为河谷中的严峻问题.流沙面积为578 km2,造成了诸如破坏农田和草场、阻塞交通和埋压水渠等危害.本文讨论了防止流沙的对策和技术,包括农业结构改革、新能源开发和机械与生物措施的结合.利用机械措施诸如草方格沙障和砾石压沙等,可以在流动沙丘上通过播种和栽植引进的固沙植物的办法建立人工植被.
The middle reaches of the Yarlung Zangbo, the Lhasa, and the Nianchu rivers form the center of politics, economy, and culture in the Tibetan Autonomous Region. Due to the fragility of the natural environment and overexploitation of land by the local people, desertification is becoming a serious problem in the valleys. Shifting sands cover an area of 578 km(2) and have caused problems such as damage to farmland and grassland, traffic blockage and burying of water projects. This paper discusses strategies and techniques for combating shifting sands, including reformation of the agricultural structure, exploitation of new sources of energy, and combinations of mechanical and biotic measures. Using mechanical measures, straw barriers, and gravel layer covers, artificial vegetation can be established on the mobile sand dune by sowing and planting introduced species.
