Water ecological health assessment based on the biological integrity of macroinvertebrate: a case from Liaohe River Basin
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摘要:
大型底栖动物完整性指数(B-IBI)在国际水生态健康评价中应用广泛,但需要结合各流域生态环境特征分别构建。以辽河流域为例,以流域99个点位水生态调查数据为基础,综合运用水质和生境质量作为参照点与受损点筛选标准,通过分布范围检验、判别能力检验和冗余性检验获得B-IBI核心参数,利用比值法进行核心参数标准化,等权求和计算B-IBI得分,最终构建适用于辽河流域的B-IBI评价体系。结果表明:辽河流域大型底栖动物包含74个分类单元,以昆虫纲为主(占总分类单元数的81.1%),个体数量最优势物种为缺尾高原纹石蛾(Hydropsyche kozhantschikovi);经筛选获得5个参照点和6个受损点,从28个备选参数中筛选出总分类单元数、毛翅目分类单元数、端足目+软体动物分类单元数、直接收集者相对丰度、黏附者分类单元数、Pielou均匀度指数6个核心参数用于计算B-IBI;B-IBI评价发现,调查时段的数据集中,4个点位处于健康等级,15个点位为亚健康等级,25个点位为一般等级,41个点位为差等级,14个点位为极差等级,流域水生态健康整体水平较差,超过1/2河段存在大型底栖动物群落结构退化现象。检验分析发现,B-IBI对水质变化具有较好的指示作用,且能有效区分出受损河段,表明B-IBI评价体系能准确表征辽河流域水生态健康状况,建议今后管理中作为辽河流域生物评价工具。
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关键词:
- 辽河流域 /
- 大型底栖动物 /
- 水生态健康 /
- 生物完整性 /
- 底栖动物完整性指数(B-IBI)
Abstract:The benthic index of biological integrity (B-IBI) is widely used for river ecological health assessment all over the world. However, this index should be constructed separately according to the ecological environmental characteristics of each river basin. In this study, the Liaohe River Basin was taken as an example, the data of macroinvertebrates of 99 sites in Liaohe River Basin was used to calculate to B-IBI. Water quality and habitat quality were comprehensively used as the selection criteria for reference sites and impacted sites. The distribution range test, discriminant ability test and redundancy test were used to screen the core metrics of B-IBI. The ratio method was used to standardize the core metrics and add up to calculate B-IBI. The results showed that a total of 74 taxa of macroinvertebrates were found, and the dominant taxon was Insecta (accounting for 81.1% of the total taxa). The most dominant species was Hydropsyche kozhantschikovi. Five reference sites and six impacted sites were obtained after screening. Six core metrics including the number of total taxa, the taxa number of Trichoptera, the taxa number of Amphipoda and Mollusca, the relative abundance of direct collectors, the number of adherent taxa, and the Pielou evenness index, were selected from 28 candidate metrics. The evaluation results of B-IBI showed that 4 sites were in health grade, 15 sites in sub-health grade, 25 sites in normal grade, 41 sites in poor grade, 14 sites in bad grade, and the whole health level of Liaohe River Basin was poor in the survey period. The macroinvertebrate community was impacted in more than half of the sampling sites. B-IBI showed a good indicating ability for the change of water quality in Liaohe River Basin, and effectively distinguish damaged sections of the river. It was suggested that B-IBI could be used as a bioassessment tool for the river basin management in future.
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表 1 辽河流域B-IBI 候选参数体系及其对干扰的响应
Table 1. Candidate metrics system of B-IBI in Liaohe River Basin and their response to disturbance
所属类别 参数名称 参数单位 对干扰的响应 种类组成 总分类单元数(A1) 个 下降 EPT1)分类单元数(A2) 个 下降 襀翅目分类单元数(A3) 个 下降 蜉蝣目分类单元数(A4) 个 下降 毛翅目分类单元数(A5) 个 下降 端足目+软体动物分类
单元数(A6)个 下降 个体丰度 襀翅目相对丰度(A7) % 下降 蜉蝣目相对丰度(A8) % 下降 毛翅目相对丰度(A9) % 下降 EPT相对丰度(A10) % 下降 摇蚊科相对丰度(A11) % 上升 双翅目相对丰度(A12) % 上升 (端足目+软体动物)相对
丰度(A13)% 上升 寡毛类相对丰度(A14) % 上升 优势类群 最优势类群相对丰度(A15) % 上升 敏感/耐污
类群敏感类群分类单元数(A16) 个 下降 耐污类群分类单元数(A17) 个 上升 功能摄食类群 滤食者相对丰度(A18) % 上升 刮食者相对丰度(A19) % 下降 直接收集者相对丰度(A20) % 上升 捕食者相对丰度(A21) % 下降 撕食者相对丰度(A22) % 下降 生态型 黏附者相对丰度(A23) % 下降 黏附者分类单元数(A24) 个 下降 多样性水平 Shannon-Wiener多样性
指数(A25)下降 Margalef丰富度指数(A26) 下降 Pielou均匀度指数(A27) 下降 Simpson多样性指数(A28) 下降 1) E表示蜉蝣目(Ephemeroptera);P表示襀翅目(Plecoptera);T表示毛翅目(Trichoptera)。 表 2 候选参数的相关性分析
Table 2. Correlation analysis of candidate metrics
参数 A1 A2 A4 A5 A6 A15 A20 A24 A25 A26 A27 A28 A1 1.000 A2 0.801** 1.000 A4 0.753** 0.944** 1.000 A5 0.525** 0.645** 0.357** 1.000 A6 0.499** 0.161 0.152 0.104 1.000 A15 −0.543** −0.533** −0.546** −0.244* −0.151 1.000 A20 −0.154 −0.092 0.041 −0.356** 0.045 0.126 1.000 A24 0.283** 0.382** 0.198* 0.623** 0.033 −0.004 −0.337** 1.000 A25 0.751** 0.688** 0.689** 0.353** 0.273** −0.925** −0.123 0.049 1.000 A26 0.924** 0.775** 0.756** 0.444** 0.434** −0.692** −0.122 0.109 0.883** 1.000 A27 0.290** 0.341** 0.363** 0.125 0.017 −0.881** −0.076 −0.093 0.801** 0.518** 1.000 A28 0.584** 0.546** 0.547** 0.279** 0.186 −0.970** −0.15 0.028 0.944** 0.740** 0.917** 1.000 注:**表示在0.01水平(双侧)显著相关;*表示在0.05水平(双侧)显著相关。 表 3 核心参数的标准化公式
Table 3. Standardized formula of core metrics
核心参数 标准化公式 A1 A1/21 A5 A5/3 A6 A6/4 A20 (1-A20)/(1-0.08) A24 A24/279 A27 A27/0.91 表 4 辽河流域B-IBI评价标准
Table 4. Criteria for B-IBI in Liaohe River Basin
健康 亚健康 一般 差 极差 ≥4.71 3.61~4.71 2.50~3.61 1.40~2.50 <1.40 表 5 Mann-Whitney U检验的秩和值(Z值)
Table 5. Rank sum (Z value ) of Mann-Whitney U test
水质类别 Ⅱ类 Ⅲ类 Ⅳ类 Ⅴ类 劣Ⅴ类 Ⅱ类 −1.805 −3.157 −2.772 −2.286 Ⅲ类 0.071* −2.628 −2.028 −1.260 Ⅳ类 0.002* 0.009* −0.111 −0.819 Ⅴ类 0.006* 0.043* 0.912 −0.703 劣Ⅴ类 0.022* 0.208 0.413 0.482 注:*表示P<0.05。 -
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