Decision support system for ecological suitability of riverine habitats

我们需要对“自然”一词进行科学或技术上的定义，作为恢复河流的技术讨论的基线。自然是什么？提出了潜在性的概念和定义，为河流生境适宜性评价提供了共同的基准。“潜在自然”指的是在气候、土壤、天气、土地利用等环境条件与目前仅消除人为影响的情况相比保持不变时所遇到的自然状态。河流的基本自然特征归纳为以下3项：1）干扰机制; 2）流域的连续性; 3）形态的多样性。在此基础上，本课题组取得了以下成果：1）改进了鱼类生境适宜度曲线; 2）建立了河流环境宏观生境模型中的水质和温度模型; 3）在野外调查的基础上，首次提出了河流环境中的潜在植被类型; 4）建立了生物多样性评价的统计方法; 5）评价了水生杂草的净水能力。

We need scientific or technological definition of the word "nature" for baseline of technical discussion for restoration of rivers. What is nature? A concept and definition of the potential nature is established for common baseline for suitability evaluation of riverine habitats. "Potential nature" stands for the state of nature which we will encounter when surrounding conditions, such as, climate, soil, weather, land use, and so on, remains unchanged from those at present only removing the human impacts.Fundamental natural characteristics of rivers are summarized into the following three items, that is, 1) disturbance regime, 2) continuity in watershed, and 3) diversity of morphology. Under the general concept mentioned above the following results are derived by this research group :1) a habitat suitability curve for fishes is improved,2) water quality and temperature models are developed in macro-habitat model of riverine environment,3) today's potential vegetation is proposed in riverine environment in the first time based on elaborate field surveys,4) a statistical approach for evaluation of bio-organisms is formulated to obtain biological diversity, and5) water purification ability of water weed is evaluated.