Carbon sink potential of eutrophic lake sediments: a reconstruction of the potntial in lakes Nakaumi and Shinji during the last about four hundred years

富营养化湖泊沉积物的碳汇潜力：近四百年来中海湖和真道湖碳汇潜力的重建

• 批准号: 22540470
• 负责人: SAMPEI Yoshikazu
• 金额: $ 3.16万
• 依托单位: Shimane University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22540470/
• 关键词: 汽水域; 有機物濃度; 有機炭素埋積速度; 二酸化炭素; 硫化水素; カーボンシンク; 中海; 宍道湖; 富栄養湖; 中海・宍道湖; サプロペル

Carbon sink potential of eutrophic lake sediments from lakes Nakaumi and Shinji was studied for recent and several hundred years environments using surface sediments and sediment cores.TOC (total organic carbon) contents of southern and central L. Nakaumi showed high sapropelic about 3.6~4.0% in the 1cm surface sediments. These values are constant from AD1997. TOC contents of all samples from L. Shinji showed also sapropelic and high about 3.5~4.3% except for eastern part. These TOC values in L. Shinji are not changed during the last 5 years. According to the result of C/N ratio (7-9) and py-GC-MS, origin of organic matter in both lakes is supposed to be predominant phyto-plankton. Sediment cores showed low TOC contents about 1% between AD1800 and 1900 in both L. Nakaumi and Shinji and TOC contents drastically increased from 1% to 4% after AD1900. Analysis of AD2003 data by our preliminary research indicates that TOC contents over 3.5% of surface sediments have a good positive correlat … More ion with H2S (ppm), showing an equation: H2S (ppm) = 13.9 * TOC (%) - 52.1 (TOC>3.5%). Atmospheric CO2 concentration on the northeastern Nakaumi was low about 360 ppm in average (April to May, 2013), which could depend on spring blooming of phyto-plankton. Impressive difference of the CO2 concentration between daytime and nighttime was up to 80 ppm. Average OCARs in the surface sediments of L. Nakaumi and Shinji are 7.0 mgC/cm2/y and 4.0 mgC/cm2/y，respectively based on the sedimentation rate reported by Kanai et al., (1998, 2002). As a result, L. Nakaumi and Shinji have a potential carbon sink of about 6,000 tonC/y and 3,200 tonC/y, respectively. Low OCARs of the cored sediments with low TOC about 1% in L. Nakaumi during 50-25 cm (1770-1890) and TOC about 0.7% in L. Shinji during 30-20cm (1830-1890), i.e. Little Ice Age, suggested 2,000 tonC/y and 1,300 tonC/y, respectively. These low values during cool climate are about one - third of the present potential. These brackish lakes are characterized as a quick response carbon sink for climate change. Less

Nakaumi和Shinji的富营营养的湖泊沉积物的碳汇率在近期和数百年的环境中使用了表面沉积物和沉积物核。TOC（总有机碳）的Nakaumi中部和中部的碳含量（总有机碳）含量显示出1CM表面沉积物的高囊量高约3.6〜4.0％。这些值是从AD1997开始的。除东部外，外部的所有样品的TOC含量也显示出腐烂，大约3.5〜4.3％。在过去的5年中，L. sinji中的TOC值没有改变。根据C/N比（7-9）和PY-GC-MS的结果，预计两个湖泊中有机物的起源将是主要的浮游生物 - 浮游生物。在Nakaumi和Shinji的AD1800和1900之间，沉积物核显示出低约1％的TOC含量，而TOC含量在AD1900之后，TOC含量均大幅增加到4％。我们的初步研究对AD2003数据的分析表明，超过3.5％的表面沉积物的TOC含量具有良好的正相关……与H2S（ppm）更多的离子，显示一个方程：H2S（PPM）= 13.9 * TOC（％）-52.1（TOC> 3.5％）。大气中nakaumi的大气二氧化碳浓度平均低约360 ppm（2013年4月至2013年5月），这可能取决于浮游植物的春季盛开。白天和夜间之间的二氧化碳浓度令人印象深刻的差异高达80 ppm。基于Kanai等人报道的沉积速率，分别为7.0 mgc/cm2/y和4.0 mgc/cm2/y，表面沉积物中的平均欧司室分别为7.0 mgc/cm2/y和4.0 mgc/cm2/y。结果，nakaumi和shinji的潜在碳汇分别为6,000吨/y和3,200吨/y。在50-25 cm（1770-1890）中，纳科米（L. nakaumi）的芯沉积物的低ocar骨会在30-20厘米（1830-1890）期间，在50-25 cm（1770-1890）中的低约1％，而TOC则在L. shinji中约为0.7％，即小冰河时代，小冰期，建议分别为2,000吨/y和1,300吨和1,300吨/y。凉爽气候期间的这些低值约为当前电位的三分之一。这些咸淡的湖泊的特征是用于气候变化的快速响应碳汇。较少的

项目成果

中海における底質表層の全有機炭素濃度の変化

中海底部沉积物表层总有机碳浓度变化

• 发表时间: 2012
• 作者: Amm;O.;R. Fujii;K. Kauristie;A. Aikio;A. Yoshikawa;A. Ieda;and H. Vanhamaki;富樫 均・原山 智・北野 聡;植田勇人・臼杵直・平内健一・三浦亮・YK10-13Leg2乗船研究者一同;三瓶良和
• 通讯作者: 三瓶良和