Development of a bacteria-based index of biotic integrity (Ba-IBI) for assessing ecological health of the Three Gorges Reservoir in different operation periods
Development of a bacteria-based index of biotic integrity (Ba-IBI) for assessing ecological health of the Three Gorges Reservoir in different operation periods
复制标题
建立基于细菌的生物完整性指数（Ba-IBI）评估三峡水库不同运行期的生态健康
DOI：
10.1016/j.scitotenv.2018.05.291
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发表时间：
2018-11-01
影响因子：
9.8
通讯作者：
Zhang, Wenlong
中科院分区：
文献类型：
--
作者：
Li, Yi;Yang, Nan;Zhang, Wenlong
考虑到三峡水库特殊的环境条件和水库运行引起的时间变化，迫切需要对三峡水库的生态健康状况进行定量评估。本研究根据三峡库区低水位期、蓄水期和泄洪期沉积物样品，开发了基于细菌的生物完整性指数（Ba-IBI）。参考条件是使用 8 个生态变量来定义的，这些变量描述了场地周围的水文形态和人为干扰。筛选过程后选择了五个核心指标，包括酸杆菌％、Gemmatimonadetes％、地杆菌％、甲烷氧化菌和光养菌％。所开发的指数可以清楚地区分参考条件和受损条件，并根据冗余（p < 0.01）和多元线性回归分析（R-2 = 0.76）与环境参数表现出显着关系。通过在TGR中实施Ba-IBI，采样点的生态健康状况分别被定义为“优秀”（25%）、“良好”（50%）和“一般”（25%）。生物完整性的空间变化与环境和生态变化密切相关，特别是养分浓度的增加。研究发现，低水位和泄洪期的生态健康状况明显好于蓄水期，这可能是由于水位波动引起的水动力变化所致。本研究全面了解三峡库区不同运行期的生态健康状况，为类似地区的水库调度提供参考。 (C) 2018 Elsevier B.V. 保留所有权利。
It is urgently needed to quantitatively assess ecological health of the Three Gorges Reservoir (TGR) when considering its special environmental conditions and temporal variations caused by reservoir operation. This study developed a bacteria-based index of biotic integrity (Ba-IBI) based on sediment samples collected along the TGR in low water level period, impoundment period and sluicing period, respectively. Reference conditions were defined using 8 ecological variables describing the hydromorphology and anthropogenic disturbances around the sites. Five core metrics, including % Acidobacteria, % Gemmatimonadetes, % Geobacter, Methanotroph and Phototroph, were selected after the screening processes. The developed index could clearly discriminate reference and impaired conditions and exhibited significant relationship with environmental parameters according to the redundancy (p < 0.01) and multivariable linear regression analysis (R-2 = 0.76). By implementing Ba-IBI in the TGR, the ecological health of the sampling sites was defined as "Excellent" (25%), "Good" (50%) and "Fair" (25%) separately. The spatial variation of biotic integrity was closely associated with environmental and ecological changes, especially the increase of nutrient concentrations. This study revealed a significant tendency that the ecological health in the low water level and sluicing periods was better than that in the impoundment period, which could be attributed to the hydrodynamic changes due to water level fluctuation. This study provides a comprehensive understanding of ecological health of the TGR in different operation periods and the index offers a guideline for the reservoir regulation in the similar areas. (C) 2018 Elsevier B.V. All rights reserved.