唐代长江流域土地利用形式及自然灾害原因

唐代后期长江中下游地区的自然灾害比前期增多且频度增大，与此同时，上游地区却少有自然灾害。作者认为，其原因在于上游地区走的是人与自然和谐一体的经济发展道路，生态环境保持较好，故少有灾害；中下游地区经济发展走的是与山林、水泊争地的道路，生态环境受到了较大的破坏,故自然灾害频频发生。

The Methods of Utilizing the Land in the Yangtze River Catchment During the Tang Dynasty and the Causes of Natural Calamities

In the later period of the Tang Dnasty,natural calamities haunted the middle and lower reaches of the Yangtze River more often than ever before;meanwhile few calamities occurred in the upper reaches.The author argues that this is because that the residents in the upper reaches took the road of developing economy in harmony with nature,keeping better the ecological environment;but in the middle and lower reaches people rivaled with forests and waters for land,resulting in serious destruction of ecological environment and frequent calamities.