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DOI	10.1007/s40333-018-0070-6
	Application and verification of simultaneous determination of cellulose C-13 and O-18 in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method
	Xu Guobao; Liu Xiaohong; Sun Weizhen; Chen Tuo; Zhang Xuanwen; Zeng Xiaomin; Wu Guoju; Wang Wenzhi; Qin Dahe
发表日期	2018
ISSN	1674-6767
起始页码	864
结束页码	876
卷号	10 期号:6
英文摘要	Stable isotopes in tree-ring cellulose provide important data in ecological, archaeological, and paleoenvironmental researches, thereby, the demand for stable isotope analyses is increasing rapidly. Simultaneous measurement of cellulose C-13 and O-18 values from tree rings would reduce the cost of isotopic commodities and improve the analytical efficiency compared with conventional separate measurement. In this study, we compared the C-13 and O-18 values of tree-ring -cellulose from Tianshan spruce (Picea schrenkiana) in an arid site in the drainage basin of the Urumqi River in Xinjiang of northwestern China based on separate and simultaneous measurements, using the combustion method (at 1050 degrees C) and the high-temperature pyrolysis method (at 1350 degrees C and 1400 degrees C). We verified the results of simultaneous measurement using the outputs from separate measurement and found that both methods (separate and simultaneous) produced similar C-13 values. The two-point calibrated method improved the results (range and variation) of C-13 and O-18 values. The mean values, standard deviations, and trends of the tree-ring C-13 obtained by the combustion method were similar to those by the pyrolysis method followed by two-point calibration. The simultaneously measured O-18 from the pyrolysis method at 1400 degrees C had a nearly constant offset with that the pyrolysis method at 1350 degrees C due to isotopic-dependence on the reaction temperature. However, they showed similar variations in the time series. The climate responses inferred from simultaneously and separately measured C-13 and O-18 did not differ between the two methods. The tree-ring C-13 and O-18 values were negatively correlated with standardized precipitation evapotranspiration index from May to August. In addition, the O-18 was significantly correlated with temperature (positive), precipitation (negative), and relative humidity (negative) from May to August. The tree-ring C-13 and O-18 values determined simultaneously through the high-temperature pyrolysis method could produce acceptable and reliable stable isotope series. The simultaneous isotopic measurement can greatly reduce the cost and time requirement compared with the separate isotopic measurement. These results are consistent with the previous studies at humid sites, suggesting that the simultaneous determination of C-13 and O-18 in tree-ring -cellulose can be used in wide regions.
英文关键词	tree rings; stable carbon and oxygen isotopes; combustion; pyrolysis; simultaneous determination; calibration; Picea schrenkiana
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
来源期刊	JOURNAL OF ARID LAND
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158510
作者单位	Xu, GB (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China.
推荐引用方式 GB/T 7714	Xu Guobao,Liu Xiaohong,Sun Weizhen,et al. Application and verification of simultaneous determination of cellulose C-13 and O-18 in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method[J],2018,10(6).
APA	Xu Guobao.,Liu Xiaohong.,Sun Weizhen.,Chen Tuo.,Zhang Xuanwen.,...&Qin Dahe.(2018).Application and verification of simultaneous determination of cellulose C-13 and O-18 in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method.JOURNAL OF ARID LAND,10(6).
MLA	Xu Guobao,et al."Application and verification of simultaneous determination of cellulose C-13 and O-18 in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method".JOURNAL OF ARID LAND 10.6(2018).