GIS在B-IBI法评价鄱阳湖水生态系统健康性中的应用

在探讨目前国内外水生态系统评价方法的基础上,采用B-IBI法评价鄱阳湖水生态系统健康性,分析认为,底栖生物参数差异性与水体理化环境相关性不明显,提出将GIS与B-IBI法耦合使用进一步提高评价结果的精度,并以鄱阳湖为研究对象验证此法的精度,结果表明:GIS与B-IBI法耦合使用评价结果较好,误差在±10%范围内;鄱阳湖水生态系统总体处于亚健康-健康状态;长江口段及周溪镇段水生态系统较差,处于病态-亚健康状态,说明开展水生态修复工程迫在眉睫。评价结论对鄱阳湖管理部门制定水生态修复方案具有一定参考意义。

Application of GIS for evaluating ecosystem health of Poyang Lake using benthic index of biotic integrity

Based on the discussion of present domestic and international evaluation methods for aquatic ecosystems, method of B-IBI is applied to the ecosystem health evaluation of Poyang Lake. Since correlation is not obvious between benthic parameter differences and physical-chemical environment. Therefore, method that GIS combined with B-IBI used in Poyang Lake in order to improve the accuracy of evaluation results. The results show that the combination of GIS and B-IBI can give arelatively accurate result with the error of ±10%. The aquatic ecosystem of Poyang Lake is overall in sub-healthy to healthy status. The ecosystems of Yangtze estuary section and Zhouxi Town section are in morbid to sub-healthy status, which indicate that carrying out aquatic ecosystem restoration project is imminent. The evaluation results have a certain reference significance for management departments of Poyang Lake to develop ecological restoration programs.