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首页> 外文期刊>The New Phytologist >Stable hydrogen isotope ratios of lignin methoxyl groups as a paleoclimate proxy and constraint of the geographical origin of wood
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Stable hydrogen isotope ratios of lignin methoxyl groups as a paleoclimate proxy and constraint of the geographical origin of wood

机译：木质素甲氧基作为古气候替代物的稳定氢同位素比率和木材地理起源的限制

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摘要

Stable isotope ratios of organic compounds are valuable tools for determining the geographical origin, identity, authenticity or history of samples from a vast range of sources such as sediments, plants and animals, including humans. Hydrogen isotope ratios (delta(2)H values) of methoxyl groups in lignin from wood of trees grown in different geographical areas were measured using compound-specific pyrolysis isotope ratio mass spectrometry analysis. Lignin methoxyl groups were depleted in (2)H relative to both meteoric water and whole wood. A high correlation (r(2) = 0.91) was observed between the delta(2)H values of the methoxyl groups and meteoric water, with a relatively uniform fractionation of -216 +/- 19 per thousand recorded with respect to meteoric water over a range of delta(2)H values from -110 in northern Norway to +20 per thousand in Yemen. Thus, woods from northern latitudes can be clearly distinguished from those from tropical regions. By contrast, the delta(2)H values of bulk wood were only relatively poorly correlated (r(2) = 0.47) with those of meteoric water. Measurement of the delta(2)H values of lignin methoxyl groups is potentially a powerful tool that could be of use not only in the constraint of the geographical origin of lignified material but also in paleoclimate, food authenticity and forensic investigations.
机译：稳定的有机化合物同位素比是确定来自多种来源（例如沉积物，动植物，包括人类）的样品的地理起源，身份，真实性或历史的宝贵工具。使用化合物特异性热解同位素比质谱分析法测量了在不同地理区域生长的树木中木质素中木质素中甲氧基的氢同位素比（δ（2）H值）。相对于陨石水和整个木材，木质素甲氧基在（2）H中被消耗。甲氧基基团的delta（2）H值与流星水之间观察到高度相关性（r（2）= 0.91），相对于流星雨水记录的相对均匀分数为-216 +/- 19 /千δ（2）H值的范围从挪威北部的-110到也门的+ 20 /千。因此，可以将北纬的木材与热带地区的木材区分开。相反，散装木材的delta（2）H值与流星水的相关性相对较低（r（2）= 0.47）。木质素甲氧基基团的delta（2）H值的测量潜在地是一个强大的工具，不仅可以用于限制木质化材料的地理来源，而且可以用于古气候，食品真实性和法医调查。

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