New methods of extinction risk assessment for threatened plants

本项目的主要目的是建立新的简单实用的风险评估方法。该项目的主要成果如下。(1)对环境厅1997年发布的红色名录中符合DD（数据缺失）标准的365种物种进行了灭绝风险评估，并将评估结果用于环境部2000年发布的红色数据手册。(2)我们开发了一个简单的公式，使用RDB中公布的定量数据来估计每10年的下降率（R）。此外，我们开发了一个方程来估计平均灭绝时间（T）使用R和人口规模（N）。(3)我们开发了一种方法的影响评估的土地利用规划在一些地区的受威胁植物是本地的。该方法使用通过上述方法估计的平均消光时间（T）。(4)我们开发了两个热点措施，以确定热点的威胁，并通过使用它们排名日本的二级滑翔机。(5)我们编制了一个日本维管植物所有类群的数据库。

The main purpose of this project was to establish new simple and practical methods of extincti on risk assessment. Main results of the project were as follows.(1) Extinction risk assessment was performed for 365 spp which were qualified as DD (data deficient) in the Red List published by the Environment Agency (1997) and the result was used in the Red Data Book published by the Ministry of Environment (2000).(2) We developed a simple equation to estimate decline rate per 10 years (R) using the quantitative data published in the RDB. Further, we developed an eqation to estimate mean extinction time (T) using R and population size (N).(3) We developed a method of impact assessment for a land use plan in some area where threatened plants are native. This method uses mean extinction time (T) estimated by the above method.(4) We developed two hotspot measures to identify hotspots of threats, and ranked secondary glids of Japan by using them.(5) We compiled a database for all taxa of Japanese vascular plants.