Influence of the Tokuyama dam construction on endangered flora of Penthorum chinense which species is affected changing environment condition.

这座最大的堆石坝“德山坝”于2007年开始运行。大坝对环境的影响被认为是非常严重的。然后利用赶黄草种群进行了为期三年的研究。结果表明，河口附近的居民受到海水潮汐的影响很大。另一方面，河中央的种群不受河况变化的影响，虽然仅评价德山大坝对这些种群的影响很难，但在大坝蓄水后，降雨量等环境扰动的变化很大，这是一个严重的影响。

The operation of this maximum rock fill dam, 'Tokuyama dam' started in 2007. The effects of large dams to the environments are considered very serious. Then I studied about the effects of this dam by using the populations of Penthorum chinense for three years. As a result, the population in the vicinity of the mouth of a river was shown that the influence by the tide of seawater would be greatly received. On the other hand, the populations at the middle of the river was not affected the changing of the river condition.It was shown that it was a serious influence after the ponding of the dam though it was difficult to evaluate only the influence of the Tokuyama dam from receiving of these population changes the environmental perturbation of the amount etc. of the rainfall greatly.