Peat cellulose isotopes as indicators of Asian monsoon variability
Peat cellulose isotopes as indicators of Asian monsoon variability
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DOI：
10.22498/pages.18.1.18
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发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
B. Hong;M. Uchida;X. Leng;Y. Hong
中科院分区：
文献类型：
--
作者：
B. Hong;M. Uchida;X. Leng;Y. Hong
页数新闻·第18卷·第1期·2010年4月SC ie NC e H ig ht S：P EA and S(δ13C增加)，反之亦然(威廉姆斯和弗拉纳根，1996年)。而循环甲烷对泥炭藻类生物标志物δ13C的影响与水分的关系相反。当泥炭地较潮湿时，深层产生的甲烷更多地被与泥炭疽共生的甲烷氧化菌呼吸，产生的低δ13C二氧化碳被泥炭藓同化，并记录在泥炭藓生物标志物的低δ13C中。在较干燥的条件下，会发生相反的情况(Nichols等人，2009年；Raghoebarsing等人，2005年)。这些相互竞争的因素需要仔细解释泥炭藓生物标志物δ13C的测量结果。结论泥炭的同位素和有机地球化学分析是了解过去气候环境变化的有价值的手段。泥炭地的复杂性要求采用多代理方法来充分利用泥炭档案中包含的古环境特征。还需要进一步研究控制不同植物化合物的同位素组成的因素(例如，植物蜡与纤维素的蒸发效应)，以更好地了解它们所包含的环境特征。参考文献Daley，T.J.，Barber，K.E.，Street-Perrott，F.A.，Loader，N.J.，March，J.D.，Crowley，S.F.，Fisher，E.H.，出版：全新世气候变异性揭示由来自英格兰北部沃尔顿莫斯的泥炭藻类纤维素的氧同位素分析揭示，第四纪科学评论，DOI：10.1016/j.quascirev.2009.09.017。McClymont，E.L.，Mauquy，D.，Yeloff，D.，Broekens，P.，van Geel，B.，Charman，D.J.，Pancost，R.D.，Chambers，F.M.和Evershed，R.P.，2008：The Mphagnum imbricata of Sphagnum imbricata from Butterburn Flow，UK，the Holocene，18：991-1002。Nichols，J.，Booth，R.K.，Jackson，S.T.，Pendall，例如和Huang，Y.，2010：泥炭沼泽中泥炭和维管植物生物标志物的氢同位素差值作为降水的定量指标--蒸发平衡，地球与宇宙学报，74：1407-1416。彭德尔，E.，Markgraf，V.，White，J.W.C.，Dreier，M.和Kenny，R.，2001：晚更新世-全新世巴塔哥尼亚泥炭沼泽气候和植被变化的多重记录，第四纪研究，55：168-178。斯克里佩克，G.，卡鲁兹尼，A.，沃伊顿，B.和杰德里塞克，M.O.，2007：苔藓碳稳定同位素组成：温度变化记录，有机地球化学，38：1770-1781。
PAGES news • Vol 18 • No 1 • April 2010 Sc ie nc e H ig hl ig ht s: P ea tla nd s (δ13C increases) and vice versa (Williams and Flanagan, 1996). However, the effect of recycled methane on δ13C of Sphagnum biomarkers has the opposite relationship with moisture. When the peatland is wetter, more methane produced at depth is respired by methanotrophs that are symbiotic with Sphagnum, the resulting low-δ13C CO2 is assimilated by Sphagnum and recorded in lower δ13C of Sphagnum biomarkers. During drier conditions, the reverse occurs (Nichols et al., 2009; Raghoebarsing et al., 2005). These competing factors necessitate careful interpretation of Sphagnum biomarker δ13C measurements. Conclusions Isotopic and organic geochemistry analyses of peats are valuable approaches for understanding past climatic and environmental change. The complexity of peatlands requires a multi-proxy approach to fully exploit the paleoenvironmental signatures contained within peat archives. Further research is also needed into the factors controlling the isotopic composition of different plant compounds (e.g., evaporative effects in plant waxes vs cellulose) to better understand the environmental signatures contained within them. References Daley, T.J., Barber, K.E., Street-Perrott, F.A., Loader, N.J., Marshall, J.D., Crowley, S.F., Fisher, E.H., in press: Holocene climate variability revealed by oxygen isotope analysis of Sphagnum cellulose from Walton Moss, northern England, Quaternary Science Reviews, doi:10.1016/j.quascirev.2009.09.017. McClymont, E.L., Mauquoy, D., Yeloff, D., Broekens, P., van Geel, B., Charman, D.J., Pancost, R.D., Chambers, F.M. and Evershed, R.P., 2008: The disappearance of Sphagnum imbricatum from Butterburn Flow, UK, The Holocene, 18: 991-1002. Nichols, J., Booth, R.K., Jackson, S.T., Pendall, E.G. and Huang, Y., 2010: Differential hydrogen isotopic ratios of Sphagnum and vascular plant biomarkers in ombrotrophic peatlands as a quantitative proxy for precipitation--evaporation balance, Geochimica et Cosmochimica Acta, 74: 1407-1416. Pendall, E., Markgraf, V., White, J.W.C., Dreier, M. and Kenny, R., 2001: Multiproxy record of late Pleistocene-Holocene climate and vegetation changes from a peat bog in Patagonia, Quaternary Research, 55: 168-178. Skrzypek, G., Kaluzny, A., Wojtun, B. and Jedrysek, M.-O., 2007: The carbon stable isotopic composition of mosses: A record of temperature variation, Organic Geochemistry, 38: 1770-1781.