摘要
修河流域为鄱阳湖流域五大支流之一,为掌握该流域水生态健康现状,该研究以2021年丰水期(8月)和枯水期(12月)14个样点的浮游植物类群和水体理化指标调查数据为基础,构建了浮游植物生物完整性指数(P-IBI)评价体系,系统评价了修河中下游水生态健康状况.调查结果表明,修河中下游共记录到浮游植物6门44属66种,其中丰水期、枯水期分别发现优势种17和5种;经分布范围检验、判别能力分析以及矩阵Pearson相关性分析筛选出6个核心评价指标,即硅藻属百分比、硅藻门细胞密度百分比、绿藻门细胞密度百分比、Shannon-Wiener指数、绿藻门细胞生物量以及硅藻门细胞生物量百分比;通过比值法统一量纲赋分并划分出4个健康评价等级,结果显示修河中下游水域整体处于"亚健康",其中处于"健康"、"亚健康"、"一般"和"差"的点位占比分别为28.57％、21.43％、21.43％和28.57％;冗余分析表明,修河中下游水生态健康的主要环境驱动因子为透明度、水温和溶解氧.该研究可为鄱阳湖子流域水生态健康管理和水生态修复提供参考与科学依据.
Abstract
Xiuhe River,one of the five major tributaries of Poyang Lake,plays a crucial role in understanding the current states of aquatic ecology in the region.Based on survey data of phytoplankton communities and physicochemical parame-ters collected at 14 sampling points during the high-flow period(August)and low-flow period(December)of 2021,a Phytoplankton Index of Biological Integrity(P-IBI)assessment system was developed to comprehensively evaluate the aquatic ecological health in the middle and lower reaches of Xiuhe River.The survey revealed a total of 66 species of phytoplankton belonging to 44 genera and 6 phyla,with 17 and 5 dominant species were found during the abundant and dry periods.Six core assessment indicators,including the percentage of diatom genera,percentage of diatom cell density,percentage of green algae cell density,Shannon-Wiener index,green algae cell biomass,and percentage of diatom cell biomass,were selected through distribution range tests,discriminant analysis,and redundancy analysis.These indicators were then standardized using a ratio method,and four health assessment levels were established.Results showed that the overall aquatic ecological health in the middle and lower reaches of the Xiuhe River was in"sub-healthy".Specifically,the proportions of sites falling into the"healthy","sub-healthy","fair",and"poor"were 28.57％,21.43％,21.43％,and 28.57％,respectively.Redundancy analysis further revealed that the key environmental drivers of aquatic ecological health in the River were transparency,water temperature and dissolved oxygen.This study provides valuable reference and scientific evidence for the management and ecological restoration of aquatic ecosystems in the sub-basins of Poyang Lake.
基金项目
长江生态环境保护修复驻点跟踪研究项目(第二期)(2022-LHYJ-02-0505)
江西省重点研发计划(20203BBG72W007)
江西省自然科学基金(20224BAB213032)
维普
万方数据