Method to measure tree-ring width,density,elemental composition,and stable carbon and oxygen isotopes using one sample  

作　　者：Chenxi Xu Yaru Zhao Wenling An Qingyu Zhao Yucheng Liu Masaki Sano Takeshi Nakatsuka 

机构地区：[1]Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,People's Republic of China [2]CAS Center for Excellence in Life and Paleoenvironment,Beijing 100044,People's Republic of China [3]College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,People's Republic of China [4]Graduate School of Environment Studies,Nagoya University,Nagoya 4648601,Japan

出　　处：《Journal of Forestry Research》2024年第3期167-174,共8页林业研究（英文版）

基　　金：supported the National Natural Science Foundation of China (42022059,41888101);the Strategic Priority Research Program of the Chinese Academy of Sciences,China (Grant No.XDB26020000);the Key Research Program of the Institute of Geology and Geophysics (CAS Grant IGGCAS-201905);the CAS Youth Interdisciplinary Team (JCTD-2021-05).

摘　　要：Tree-ring width(RW),density,elemental com-position,and stable carbon and oxygen isotope(δ^(13)C,δ^(18)O)are widely used as proxies to assess climate change,ecology,and environmental pollution;however,a specific pretreat-ment has been needed for each proxy.Here,we developed a method by which each proxy can be measured in the same sample.First,the sample is polished for ring width meas-urement.After obtaining the ring width data,the sample is cut to form a 1-mm-thick wood plate.The sample is then mounted in a vertical sample holder,and gradually scanned by an X-ray beam.Simultaneously,the count rates of the fluorescent photons of elements(for chemical characteriza-tion)and a radiographic grayscale image(for wood density)are obtained,i.e.the density and the element content are obtained.Then,cellulose is isolated from the 1-mm wood plate by removal of lignin,and hemicellulose.After producing this cellulose plate,cellulose subsamples are separated by knife under the microscope for inter-annual and intra-annual stable carbon and oxygen isotope(δ^(13)C,δ^(18)O)analysis.Based on this method,RW,density,elemental composition,δ^(13)C,and δ^(18)O can be measured from the same sample,which reduces sample amount and treatment time,and is helpful for multi-proxy comparison and combination research.

关 键 词：Tree-ring width Tree-ring density Tree-ring elemental composition Tree-ring stable carbon and oxygenisotopes 

分 类 号：S718.4[农业科学—林学]