河流着生藻类多样性对城镇化的响应-以深圳市为例

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 河流着生藻类多样性对城镇化的响应——以深圳市为例 DOI: 10.5846/stxb202105271393 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 深圳市主要河流水生态监测与评价项目（NO.2019-07-233） Response of stream benthic algal diversity to urbanization: A case study in Shenzhen Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:着生藻类是河流生态状况的重要指示生物，然而关于城镇化对着生藻类多样性影响的研究还较缺乏。基于深圳市9条主要河流74个样点2020年雨、旱季的调查数据，对比了城区、郊区河流样点的着生藻类α、β多样性。两次调查共鉴定出着生藻类301个分类单元，其中硅藻门种类最多。谷皮菱形藻（Nitzschia palea）、隐头舟形藻（Navicula cryptocephala）、平庸菱形藻（Nitzschia inconspicua）等污染指示种在城区组相对丰度更高，而清洁指示种微小曲丝藻（Achnanthidium minutissimum）在郊区组相对丰度更高。城镇化对着生藻类物种丰富度、香农维纳多样性指数、Pielou均匀度指数等α多样性指数均无显著影响，但对着生藻类群落结构有显著影响。城区组样点的着生藻类β多样性（用主坐标分析质心指示）低于郊区组，城区组与郊区组藻类β多样性差异在旱季更为显著。两组样点的藻类β多样性差异主要来源于物种周转组分。与城区组着生藻类群落显著相关的环境因子包括总氮、高锰酸钾指数、电导率、pH、浊度和水深，而与郊区组着生藻类群落显著相关的是总氮、溶解性无机磷和电导率。研究发现，城市人类活动导致的总氮、溶解性无机磷、高锰酸钾指数、电导率等指标的显著增高导致着生藻类β多样性的降低。为了保护河流生物多样性，建议有效控制城区生产生活污水排放，减少人类活动对河流的干扰。 Abstract:Benthic algae are important indicators for ecological conditions of streams and rivers, but studies on effects of urbanization on benthic algal diversity is still sparse. In this study, we surveyed 74 sites from nine rivers located in Shenzhen City in the wet and dry season of 2020, and compared differences of α- and β- diversity of lotic benthic algal assemblages between urban and suburban groups. A total of 301 algal taxa were identified in the two seasons, among which the most taxa belonging to diatoms. The relative abundance of pollution indicator species such as Nitzschia palea, Navicula cryptocephala and Nitzschia inconspicua was higher in the urban groups, while the suburban groups with higher relative abundance of Achnanthidium minutissimum, which is an indicator species of clean water. We found that urbanization had no significant effects on algal α-diversity indices including richness, Shannon-Wiener's diversity index, and Pielou's index; while, algal community compositions in urban sites were significantly different from that of suburban sites. β-diversity of benthic algae, represented by centroids of the principal coordinate analysis, was lower for the urban sites than that of the suburban sites, with more significant difference in the dry season. The difference of benthic algal assemblages between the two groups mainly came from species turnover components. Total nitrogen, CODMn, conductivity, pH, turbidity and water depth were identified by the Mantel test as the environmental factors that were significantly correlated with algal community compositions in the urban group; while, TN, Dissolved inorganic Phosphorus (PO4-P) and conductivity were significantly correlated with the community compositions of benthic algae in the suburban group. We found that levels of TN, PO4-P, CODMn and conductivity were significantly increased in the urban group, which decreased β-diversity of benthic algae communities in Shenzhen rivers. To protect biodiversity of Shenzhen rivers, we therefore suggest to effectively control domestic and industrial sewage in urban areas to reduce human disturbance to rivers. 参考文献 相似文献 引证文献