本文构建了一个基于Web的仿真想定管理系统,采用数据库技术实现仿真模型管理和仿真想定管理功能。通过浏览器访问的方式支持各类仿真模型和仿真想定的存储、下载、信息查询、权限管理和版本管理。基于WebGIS(geography information syst...本文构建了一个基于Web的仿真想定管理系统,采用数据库技术实现仿真模型管理和仿真想定管理功能。通过浏览器访问的方式支持各类仿真模型和仿真想定的存储、下载、信息查询、权限管理和版本管理。基于WebGIS(geography information system)技术实现二维地图上武器模型的动态部署,模型作用范围的显示,高程信息的查询以及XML格式想定文件的自动生成。系统实现了仿真模型、想定的有效管理和仿真想定的直观快速构建,本文对系统所涉及的4类关键技术进行了详细说明。展开更多
Natural ecosystems provide society with important goods and services. With the rapid increase in human populations and excessive utilization of natural resources, humans frequently enhance the production of some servi...Natural ecosystems provide society with important goods and services. With the rapid increase in human populations and excessive utilization of natural resources, humans frequently enhance the production of some services at the expense of the others. Although the need for tradeoffs between conservation and development is urgent, the lack of efficient methods to assess such tradeoffs has impeded progress. Three land use strategy scenarios （development scenario, plan trend scenario and conservation scenario） were created to forecast potential changes in ecosystem services from 2007 to 2050 in Beijing, China. GIS-based techniques were used to map spatial and temporal distribution and changes in ecosystem services for each scenario. The provision of ecosystem services differed spatially, with significant changes being associated with different scenarios. Scenario analysis of water yield （as average annual yield） and soil retention （as retention rate per unit area） for the period 2007 to 2050 indicated that the highest values for these parameters were predicted for the forest habitat under all three scenarios. Annual yield/retention of forest, shrub, and grassland ranked the highest in the conservation scenario. Total water yield and soil retention increased in the conservation scenario and declined dramatically in the other two scenarios, especially the development scenario. The conservation scenario was the optimal land use strategy, resulting in the highest soil retention and water yield. Our study suggests that the evaluation and visualization of ecosystem services can effectively assist in understanding the tradeoffs between conservation and development. Results of this study have implications for planning and monitoring future management of natural capital and ecosystem services, which can be integrated into land use decision-making.展开更多
文摘本文构建了一个基于Web的仿真想定管理系统,采用数据库技术实现仿真模型管理和仿真想定管理功能。通过浏览器访问的方式支持各类仿真模型和仿真想定的存储、下载、信息查询、权限管理和版本管理。基于WebGIS(geography information system)技术实现二维地图上武器模型的动态部署,模型作用范围的显示,高程信息的查询以及XML格式想定文件的自动生成。系统实现了仿真模型、想定的有效管理和仿真想定的直观快速构建,本文对系统所涉及的4类关键技术进行了详细说明。
基金supported by the National Key Basic Research Program of China (No. 2009CB421105,2006CB403402)the Special Foundation from State Key Laboratory of Urban and Regional Ecology
文摘Natural ecosystems provide society with important goods and services. With the rapid increase in human populations and excessive utilization of natural resources, humans frequently enhance the production of some services at the expense of the others. Although the need for tradeoffs between conservation and development is urgent, the lack of efficient methods to assess such tradeoffs has impeded progress. Three land use strategy scenarios （development scenario, plan trend scenario and conservation scenario） were created to forecast potential changes in ecosystem services from 2007 to 2050 in Beijing, China. GIS-based techniques were used to map spatial and temporal distribution and changes in ecosystem services for each scenario. The provision of ecosystem services differed spatially, with significant changes being associated with different scenarios. Scenario analysis of water yield （as average annual yield） and soil retention （as retention rate per unit area） for the period 2007 to 2050 indicated that the highest values for these parameters were predicted for the forest habitat under all three scenarios. Annual yield/retention of forest, shrub, and grassland ranked the highest in the conservation scenario. Total water yield and soil retention increased in the conservation scenario and declined dramatically in the other two scenarios, especially the development scenario. The conservation scenario was the optimal land use strategy, resulting in the highest soil retention and water yield. Our study suggests that the evaluation and visualization of ecosystem services can effectively assist in understanding the tradeoffs between conservation and development. Results of this study have implications for planning and monitoring future management of natural capital and ecosystem services, which can be integrated into land use decision-making.
