Is cellulose extraction necessary for developing stable carbon and oxygen isotopes chronologies from Callitris glaucophylla
Is cellulose extraction necessary for developing stable carbon and oxygen isotopes chronologies from Callitris glaucophylla
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纤维素提取对于从 Callitris glaucophylla 中开发稳定的碳和氧同位素年表是否必要
DOI：
10.1016/j.palaeo.2005.11.003
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
P. Grierson
中科院分区：
文献类型：
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作者：
Louise Cullen;P. Grierson
我们研究了提取纤维素的必要性，以建立稳定的碳和氧同位素年代学的西洋参J.Thompson和L.A.S.约翰逊(柏科)。我们比较了1979-1999年期间全木材、纤维素和气候的同位素之间的关系，并使用了10年窗口的移动间隔技术。在整个时期内，全木材和纤维素的同位素显著相关，并与气候有相似的关系。总体而言，δ13C和δ18O的变化与夏季温度、相对湿度和降雨量有关。然而，整个木材的δ13C和δ18O与气候的相关性总体上弱于纤维素，而随时间的变化较大。此外，与纤维素的同位素一样，整个木材的同位素也没有偏离1979-1999年的平均值。整个木材-气候关系的不稳定性可能是由于在整个木材中包含了来自木质素的气候信号，这种信号在树木年轮之间比纤维素更具变异性。总体而言，蓝叶锦鸡儿至少是整块木材记录气候的方式与纤维素不同，纤维素的稳定同位素提供了过去气候在时间上更稳定的替代品。我们建议，当制定其他物种的同位素年表时，应考虑到它们与气候关系的时间稳定性，以评估整个木材与纤维素作为气候替代品的适宜性。
We examined the necessity of extracting cellulose for the development of stable carbon and oxygen isotope chronologies from Callitris glaucophylla J. Thompson and L.A.S. Johnson (Cupressaceae). We compared relationships among isotopes of whole wood, cellulose and climate for the period 1979–1999 and using a moving interval technique with a 10-year window. Isotopes of whole wood and cellulose were significantly correlated and had similar relationships with climate when considered over the entire period. In general, variation in δ13C and δ18O was related to summer temperature relative humidity and rainfall. However, δ13C and δ18O of whole wood generally exhibited weaker and more variable correlations with climate through time than cellulose. In addition, isotopes of whole wood did not deviate from 1979 to 1999 mean values in the same way as isotopes of cellulose. The instability of whole wood–climate relationships may be due to the inclusion in whole wood of a climate signal from lignin that is more variable between tree rings than cellulose. Overall, it appears that C. glaucophylla at least whole wood does not record climate in the same way as cellulose and stable isotopes of cellulose provide a more temporally stable proxy of past climate. We suggest that when developing isotope chronologies for other species the suitability of whole wood vs. cellulose as a proxy for climate should be assessed with consideration of the temporal stability of their relationship with climate.