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首页> 外文期刊>Limnologica >Experimental and geochemical evidence for Delta 7/Delta 5 sterol ratios as indicators of trophic status in Lake Fuxian, a great lake in Yunnan Province, SW China
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Experimental and geochemical evidence for Delta 7/Delta 5 sterol ratios as indicators of trophic status in Lake Fuxian, a great lake in Yunnan Province, SW China

机译：实验和地球化学证据表明Delta 7 / Delta 5固醇比可作为中国西南地区云南大湖抚仙湖营养状态的指标

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摘要

The reliability of Delta 7/Delta 5 sterol ratios as an indicator of trophic status in Lake Fuxian was tested with in situ nutrient enrichment incubation experiment and a comparison of Delta 7/Delta 5 values in the strata of a sediment core with the known chronology of nutrient enrichment in the lake. The results indicated that the Delta 7/Delta 5 sterol ratios (including sum of Delta 7/sum of Delta 5 sterol ratios and C27-C29 Delta 7/C27-C29 Delta 5 sterol ratios) in the incubation water increased consistently with total phosphorus (TP) and total nitrogen (TN) concentration across the full experimental range from 0.012 to 0.130 mg/L and from 0.068 to 1.351 mg/L, respectively. The covariation between Delta 7/Delta 5 sterol ratios and TP and TN concentration could be explained by enhanced productivity of Delta 7 sterol-producing green algae (e.g., Scenedesmus sp.) under the prevailing nutrient conditions. A sediment core from Lake Fuxian showed a two-stage increase in C27-C29 Delta 7/C27-C29 Delta 5 sterol ratios over time, including a small rise from 1951 to 1986, and a much greater increase since 1986. These results coincide with the two-stage eutrophication previously documented in Lake Fuxian using geochemical evidence and water quality monitoring data. This study therefore demonstrates Delta 7/Delta 5 sterol ratio as a credible descriptor of trophic status in Lake Fuxian. (C) 2016 Elsevier GmbH. All rights reserved.
机译：通过原位营养富集温育实验并以已知的年代学比较了沉积物核心层中Delta 7 / Delta 5值的比较，测试了Delta 7 / Delta 5甾醇比例作为抚仙湖营养状态指标的可靠性。湖中养分丰富。结果表明，孵化水中的Delta 7 / Delta 5固醇比（包括Delta 7的总和/ Delta 5固醇比的总和和C27-C29 Delta 7 / C27-C29 Delta 5固醇的比）与总磷（ TP）和整个实验范围内的总氮（TN）浓度分别为0.012至0.130 mg / L和0.068至1.351 mg / L。 Delta 7 / Delta 5固醇比与TP和TN浓度之间的协方差可以通过在主要营养条件下提高产生Delta 7固醇的绿藻（例如Scenedesmus sp。）的生产力来解释。抚仙湖的沉积物芯随时间的推移显示C27-C29 Delta 7 / C27-C29 Delta 5固醇比有两个阶段的增加，包括从1951年到1986年的小幅增加，以及自1986年以来的大幅度增加。这些结果与富县湖以前利用地球化学证据和水质监测数据记录的两阶段富营养化。因此，这项研究证明了Delta 7 / Delta 5甾醇比率是抚仙湖营养状态的可靠描述。 （C）2016 Elsevier GmbH。版权所有。

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