Development of maintenance means that mitigates risks of ecosystem conservation facilities

研究结果表明，生态系统保护设施在保护生物多样性的同时，也会造成河道能力的降低和河道内物质流动的均一化。提出了一些测量生态系统过渡的方法。很明显，铲土和割草对农民来说是繁重的劳动。在农村老龄化地区引入生态系统保护设施的障碍是铲伐。在当地观察到具有遗传多态性的小群体居住。生态保护设施建设要求如下：1)考虑环境因素，例如上游的土地利用，决定泥沙的数量是重要的。2)有必要根据人的维护能力，考察半自然施工方法与传统施工方法的结合。3)考虑遗传特征可能需要在管道网络。

It was confirmed that ecosystem conservation facilities pose depression of canal ability and homogenization of material flow in canals, although it contribute largely to conserve biodiversity. Some methods were developed to measure transition of ecosystem. It became clear that to shovel dirt and to cut grass were heavy labor for farmers. Shoveling and cutting would be obstacles to introduce ecosystem conservation facilities to aging rural area. Inhabitation of small group that had genetic polymorphism locally was observed.Requirement for construction of ecosystem conservation facilities are as follows.1) To consider environmental elements, for example land use in upper reaches, that determine quantity of sediment is important.2) It is necessary to examine combination of Semi-natural construction method and traditional method depending on the maintenance ability by humans.3) To consider genetic characteristics may be needed for networking of canals.