Stable carbon and oxygen isotopic composition of modern land snails along a precipitation gradient in the mid-latitude East Asian monsoon region of China

Stable carbon and oxygen isotopic composition of modern land snails along a precipitation gradient in the mid-latitude East Asian monsoon region of China
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中国中纬度东亚季风区现代陆地蜗牛沿降水梯度的稳定碳氧同位素组成

DOI:
10.1016/j.palaeo.2019.109236
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发表时间:
2019-11
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Jun Chen
Jun Chen
中科院分区:
其他
文献类型:
--
作者:
Rui Bao;Xuefen Sheng;Huayu Lu;Chenglong Li;Ling Luo;Hua Shen;Min Wu;Junfeng ji;Jun Chen

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中国寒武纪黄土沉积中保存的陆壳的氧碳稳定同位素组成(δ 18 O壳和δ 13 C壳)具有重建晚渐新世以来东亚夏季风(EASM)过去变化的潜力。为了评估δ 18 O壳和δ 13 C壳在半定量重建东亚夏季风过去变化中的潜力,我们研究了三种不同生态系统的现代蜗牛和相应的植被组成(林地、草地和山区),跨越大降雨梯度(178- 1403毫米)结果表明,三个生态系统中不同螺种的δ 18 O壳和δ 13 C壳值存在显著差异,东部平原区林地中的螺种δ 18 O壳和δ 13 C壳值显著偏低黄土高原草地和秦巴山区的δ 13 C值介于两者之间,沿降雨梯度,螺壳、螺体组织和当地植物的δ 13 C值有明显的系统变化,表明螺壳δ 13 C值主要受δ 13 C值的影响,而δ 13 C值的变化受东亚夏季风的控制。我们确认δ 13 Cshell是一个可靠的降水代用指标,并根据本研究的结果以及Bao et al.(2018)的结果,我们获得了δ 13 Cshell与平均年降水量之间关系的新经验方程(δ 13 Cshell =−0.0030(±0.0003)MAP−8.80(±0.32),r=− 0.76,n =74,p< 0.001)。δ ~(18)O_(shell)受降水量δ ~(18)O的影响,δ ~(18)O_(shell)与年平均降水量有显著的相关关系(δ 18 Oshell =−0.0028(±0.0008)MAP−1.32(±0.58),r=-0.65,p <0.05,n =21),可能是由于研究区降雨的影响,此外,温度和相对湿度相关的蒸发在确定δ 18 O壳层时起着不可忽略的作用,在利用化石螺壳δ 18 O重建降水δ 18 O和/或降水量时,应考虑它们的影响。
The stable oxygen and carbon isotope composition (δ18Oshelland δ13Cshell) of land snail shells preserved inChineseeolianloessdepositshavethepotentialtoreconstructpastchangesintheEastAsianSummerMonsoon(EASM) since the late Oligocene. To assess the potential of δ18Oshelland δ13Cshellfor the semi-quantitative re-constructionofpastvariationsoftheEASM,westudiedmodernsnailsandthecorrespondingvegetationcom-position of three distinct ecosystems (woodland, grassland and mountains), spanning a large rainfall gradient(178–1403mm)inthemid-latitudeEastAsianmonsoonregion.Theresultsshowthatdifferentsnailspeciesinthethreeecosystemshavesignificantlydifferentvaluesofδ18Oshellandδ13Cshell.Thesnailsinwoodlandfromtheeasternplainareahavesignificantlylowerδ18Oshellandδ13CshellvaluesthanthoseofsnailsingrasslandfromtheChinese LoessPlateau, andthe snailsfrom theQinba Mountainsregion have valuesintermediate between thetwo.Systematicvariationsoftheδ13Cofsnailshells,bodytissuesandlocalplantsareevidentalongtherainfallgradient,indicatingthatδ13Cshellismainlyinfluencedbytheδ13Cofingestedplants,whichiscontrolledbytheEASM. We confirm that δ13Cshellis a reliable precipitation proxy and we obtained a new empirical equation(δ13Cshell=−0.0030(±0.0003) MAP−8.80(±0.32),r=−0.76,n=74,p< 0.001) for the relationshipbetween δ13Cshelland mean annual precipitation, which is based on the results of the present study, togetherwith those of Bao et al. (2018). We infer that δ18Oshellis influenced by precipitation δ18O, and that here is asignificant relationship between δ18Oshelland mean annual precipitation (δ18Oshell=−0.0028(±0.0008)MAP−1.32(±0.58),r=−0.65,p< 0.05,n=21),possiblybecauseoftherainfallamounteffectinthestudyregion.Inaddition,temperatureandevaporationassociatedwithrelativehumidityplaynon-negligiblerolesindetermining δ18Oshell, and their effects should be considered before using the δ18O of fossil snail shells to re-construct precipitation δ18O and/or rainfall amount.
DOI: 10.1016/s0012-821x(01)00585-4
发表时间: 2002-02
影响因子: 5.3
作者:
L. Stott
通讯作者: L. Stott
DOI: 10.1016/s0921-8181(00)00042-4
发表时间: 2000-11
期刊: --
影响因子: --
作者:
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通讯作者: P. Abell;I. Plug
DOI: 10.1016/0012-821x(87)90234-2
发表时间: 1987-12-01
影响因子: 5.3
作者:
GOODFRIEND, GA;MAGARITZ, M
通讯作者: MAGARITZ, M
DOI: 10.1016/s1040-6182(00)00008-2
发表时间: 2000-05
影响因子: 2.2
作者:
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通讯作者: G. Goodfriend;G. Ellis
DOI: --
发表时间: 2010
期刊: Transactions of Atmospheric Sciences
影响因子: --
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