水生生物学报2018，Vol.42Issue(1)：162-170,9.DOI:10.7541/2018.021
武汉市沙湖摇蚊亚化石记录的湖泊生态环境变化
ECOLOGICAL ENVIRONMENT CHANGES INFERRED FROM SUBFOSSIL CHIRONOMID RECORD OF SHAHU LAKE IN WUHAN CITY
摘要
Abstract
This study aimed to reconstruct total phosphorus (TP) concentration in the water column and to reveal the history of environmental changes since the 1970s in Shahu Lake based on subfossil chironomid assemblages analysis of a 41-cm length sediment core, combined with 210Pb dating, chironomid-inferred total phosphorus (CI-TP) transfer func-tion in the middle and lower reaches of the Yangtze River, detrending correspondence analysis (DCA) and documen-tary data of Wuhan City. Three distinct stages were identified in chironomid assemblages. From 1973 to 1989, the domi-nance of macrophyte-related taxa (e.g. Cricotopus sylvestris and Dicrotendipes nervosus-type) indicated that the develop-ment of macrophytes in the lake, with CI-TP fluctuating from 47 to 55 μg/L. Meanwhile, sedimentary TP maintained around 700 mg/kg. From 1989 to 2000, sedimentary TP doubled its concentration and CI-TP increased to above 100μg/L, concurrent with a marked decrease of the relative abundance in macrophyte-related taxa. These lines of evidence revealed that the lake had shifted from a mesotrophic status to a eutrophic condition. After 2002, sedimentary TP in-creased continuously to more than 2000 mg/kg. Concurrently, the chironomid assemblages were dominated by eutrop-hic species (i.e., Tanypus and Propsilocerus akamusi-type), with the CI-TP concentration above 150 μg/L. The first DCA axis captured 62.1％ of total variance in the chironomid data and was significantly correlated with sedimentary TP, suggesting that variations in chironomid assemblages were mainly the consequence of nutrient enrichment. Lake eutrophication was in association with both lake area shrinkage and sewage inputs resulted from the urbanization in Wuhan City. This study revealed that the baseline TP concentration of Shahu Lake was around 50 μg/L and reducing external nutrient inputs is crucial for water environment protection.关键词
摇蚊亚化石/降趋势对应分析/城市化/湖泊富营养化/沙湖Key words
Subfossil chironomid/Detrended correspondence analysis/Urbanization/Lake eutrophication/Shahu Lake分类
生物科学引用本文复制引用
黄春玲,曹艳敏,陈旭..武汉市沙湖摇蚊亚化石记录的湖泊生态环境变化[J].水生生物学报,2018,42(1):162-170,9.基金项目
国家自然科学基金(41402307和41572343) （41402307和41572343）
中央高校基本科研业务费专项基金(CZQ14019)资助 [Supported by the National Natural Science Foundation of China (41402307, 41572343) （CZQ14019）
Fundamental Research Funds for the Central Universities (CZQ14019)] （CZQ14019）
