挠力河流域平原区湿地景观完整性评价

探讨一种景观完整性评价方法对湿地管理和保护非常重要.利用遥感和GIS技术,选择10个指标构建景观完整性指数,对挠力河流域平原区开展景观完整性评价.结果显示,1950年挠力河流域洪泛平原中的湿地景观完整性远好于2005年;人类活动影响越强的区域湿地景观完整性越差;2005年仅河岸带湿地景观比其它区域具有较好的景观完整性.由于景观完整性指数包涵了必要的景观结构和功能完整性特征信息,对评价景观尺度生态完整性,诊断生态受损区域,保护、恢复和管理湿地具有重要作用.

Landscape integrity assessment of wetlands in flood plain of Naoli Catchment,China

Ecological integrity is a key concept in natural resource management and environmental protection and can be defined as the capacity to support and maintain a balanced, integrative, adaptive biological system, having the full range of elements and processes in the natural habitat of a region at ecosystem scale. However, ecological integrity is difficult to measure at landscape scale. A practical index of landscape integrity must provide information on the status, condition, and spatial heterogeneity of ecosystems, and it needs to include indicators of functional as well as the structural attributes. Furthermore, landscape ecology has demonstrated the importance of considering landscape context in addition to local site attributes when explaining local ecological processes and ecological integrity. The main goal of our study was to develop a landscape integrity assessment measure for wetland management and conservation in the flood plain area of Naoli Catchment that have been highly impacted by human activities at landscape scale. Based on remote sensing data and GIS techniques, we selected 10 indicators (6 for structure and 4 for function of wetlands) to constitute the landscape integrity index proposed. The conclusions showed that wetlands in the flood plain area of Naoli Catchment in 1950 had more ecological integrity than those in 2005. More human influence resulted in less ecological integrity. The riparian wetlands had the best ecological integrity than other areas in the catchment in 2005. The landscape integrity index developed here has a number of essential characteristics that make it a useful tool to assess and maintain ecological integrity, diagnose possible causes of ecological impairment, establish criteria for protecting and restoring wetland ecosystems, and integrate catchment management at landscape scale.