Source and quantity of carbon influence its sequestration in Rostherne Mere (UK) sediment: a novel application of stepped combustion radiocarbon analysis
Source and quantity of carbon influence its sequestration in Rostherne Mere (UK) sediment: a novel application of stepped combustion radiocarbon analysis
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碳的来源和数量影响其在 Rostherne Mere（英国）沉积物中的封存：分级燃烧放射性碳分析的新应用
DOI：
10.1007/s10933-020-00141-1
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发表时间：
2020
影响因子：
2.1
通讯作者：
Keaveney E
中科院分区：
文献类型：
--
作者：
Keaveney E
我们探讨了浮游植物生产、碳源和人类活动对富营养化湖泊（Rostherne Mere， UK）碳积累的作用，以了解营养负荷、藻类群落结构和流域管理的变化如何影响湖泊沉积物中的碳固存。对水样（溶解的无机碳、有机碳和颗粒碳）进行了分析，以调查当代碳源。为了确定藻类群落和碳源的历史生产速率，研究了代表过去~ 90年积累的55 cm沉积物岩心中的多个变量。根据沉积硅藻丰度和高效液相色谱（HPLC）色素方法推断，净初级产量的波动与集水区污水处理厂（STW）的营养输入有关。阶阶燃烧放射性碳（SCR）测量表明，湖泊沉积物中含有11% （~ 1929 CE）至69% （~ 1978 CE）的顽固性碳，其碳特征的变化与积累速率的峰值一致，并与STW输入有关。集水区扰动是通过放射性碳分析确定的，包括20世纪30年代的污水处理厂建设，使用SCR分析确定，以及最近附近的高速公路建设，通过测量湖泊和流出河流的溶解有机碳来确定。原生碳埋藏量与硅藻生物体积积累速率（DBAR）有关，随着硅藻积累速率和阀尺寸的降低，原生碳埋藏量减少，尽管净碳产量总体增加。HPLC色素分析表明，总碳沉积和硅藻积累的变化与非硅藻的增殖有关。HPLC结果还表明，沉积物有机碳中顽固性碳的优势可能是由于沉积增加而不是保存因素。藻类总积累速率控制沉积物有机碳积累速率，而DBAR与各碳源埋藏比例相关。
We explored the roles of phytoplankton production, carbon source, and human activity on carbon accumulation in a eutrophic lake (Rostherne Mere, UK) to understand how changes in nutrient loading, algal community structure and catchment management can influence carbon sequestration in lake sediments. Water samples (dissolved inorganic, organic and particulate carbon) were analysed to investigate contemporary carbon sources. Multiple variables in a 55-cm sediment core, which represents the last ~ 90 years of accumulation, were studied to determine historical production rates of algal communities and carbon sources. Fluctuations in net primary production, inferred from sedimentary diatom abundance and high-performance liquid chromatography (HPLC) pigment methods, were linked to nutrient input from sewage treatment works (STW) in the catchment. Stepped combustion radiocarbon (SCR) measurements established that lake sediment contains between 11% (~ 1929 CE) and 69% (~ 1978 CE) recalcitrant carbon, with changes in carbon character coinciding with peaks in accumulation rate and linked to STW inputs. Catchment disturbance was identified by radiocarbon analysis, and included STW construction in the 1930s, determined using SCR analysis, and recent nearby highway construction, determined by measurements on dissolved organic carbon from the lake and outflow river. The quantity of autochthonous carbon buried was related to diatom biovolume accumulation rate (DBAR) and decreased when diatom accumulation rate and valve size declined, despite an overall increase in net carbon production. HPLC pigment analysis indicated that changes in total C deposition and diatom accumulation were related to proliferation of non-siliceous algae. HPLC results also indicated that dominance of recalcitrant carbon in sediment organic carbon was likely caused by increased deposition rather than preservation factors. The total algal accumulation rate controlled the sediment organic carbon accumulation rate, whereas DBAR was correlated to the proportion of each carbon source buried.
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DOI：
--
发表时间：
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期刊：
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影响因子：
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作者：
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影响因子：
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