历史上森林变迁对永定河的影响

Impact analysis of historical forest change on Yongding River

研究历史上永定河流域森林变迁情况,发现辽金时代是一个转折点。元明清三朝代,由于定都北京和人口剧增,永定河流域森林遭到了大规模的破坏,由此带来了永定河的一系列变化,促使其治理开发重点发生了转移。

Sudies on the historical forest change in Yongding River Basin have found that Liaojin Dynasty is the turning point. Forest in the Yongding River Basin suffered tremendous damages in the Yuan, Ming and Qing dynasties after Beijing was announced as the capital that resulting in population increasing. The focus of river management had to alter in the Yongding River Basin because of this change.