中国科学院兰州分院完成的调查表明 ,目前西部地区生态环境呈现出普遍脆弱、局部改善、短　　　　期改善、长期恶化的特征 ,这种生态环境现状将长期阻碍着西部地区潜在优势的发挥。西部地区　　　　是我国自然生态的极端脆弱区 ,水土流失、土地荒漠化、土壤盐渍化等土地退化现 The survey conducted by Lanzhou Branch of the Chinese Academy of Sciences shows that at present the ecological environment in the western region is characterized by general fragility, partial improvement, short-term improvement and long-term deterioration. Such an ecological environment will, for a long time, hinder the development of potential advantages in the western region. The western region is an extremely fragile region of our country’s natural ecology. Land degradation such as soil erosion, land desertification and soil salinization are now