Interrelation analysis on tourism resource development of the eastern coastal zone in shandong province 山东省东部沿海地区旅游资源开发相关性分析
Moreover , the aid of gray interrelation analysis and the plural regression model are applied to discuss the reason of runoff decrease and abrupt changes . for over 40 years , under the background of climatic warming , river runoff of shaanxi - gansu - ningxia region has showed a generally reduction trend 40多年来,在气候暖干化的背景下,陕甘宁地区地表水资源变化总趋势为减少,表现为自1950年代末以来河川年径流量的显著减少倾向,而且贫水化也日趋严重。