干旱区生态环境知识资源中心(Arid): 树轮稳定氧同位素重建东大山过去205年来水汽压变化

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	树轮稳定氧同位素重建东大山过去205年来水汽压变化
其他题名	Vapor pressure variations reconstructed by tree-ring stable oxygen isotopes in Dongda Mountain during the past 205 years
	李强; 邓若兰; 刘若时; 刘禹
来源期刊	地球环境学报
ISSN	1674-9901
出版年	2020
卷号	11 期号:6 页码:639-647
中文摘要	对采自河西走廊东大山的青海云杉(Picea crassifolia)树轮样本提取纤维素并测定其稳定氧同位素比率(delta~(18)O),建立过去205年来树轮delta~(18)O年表序列。与观测数据相关分析发现树轮delta~(18)O年表与周边7-8月平均水汽压具有显著的负相关关系(r =-0.643,n = 59,p<0.001),因此重建了河西走廊东大山周边过去205年的7-8月平均水汽压变化序列,重建方程方差解释量达41.4%,分段检验表明水汽压重建结果稳定可靠。在重建的205年中,水汽压力偏大阶段有6个,偏低阶段有7个。该重建序列与周边地区的水文气候重建的干湿阶段变化及西北地区极端干旱历史事件具有一定的同步性,并可代表大区域范围水汽压变化,进一步证明了本文重建序列的准确性。空间相关分析结果暗示研究区7-8月水汽主要受亚洲季风影响,同时伴有少量西风水汽传输。
英文摘要	Background, aim, and scope Due to the global warming, the regional climate and hydrological processes are undergoing the major changes, the surface water vapor pressure in the northwest arid region is closely related to the water vapor content and precipitation.The water vapor is the most active component in the global water cycle processes.It is of great significance to grasp the facts and laws of water vapor pressure change for understanding the regional water circulation process and its response to the global change.However, the recording history of the instrumental data is too short to be used in the study of long-time scale climate change.The tree rings have an incomparable advantage in the study of past climate change in the arid areas.This study is intended to provide the research data of tree rings in the Dongda Mountain of Hexi Corridor, the facts of regional climate change are revealed, the basic data are provided for understanding the causes of climate change in the northwestern China, and the scientific reference is provided for the utilization of water resources in the arid areas.Materials and methods The total 66 sample cores of 39 Picea crassifolia were collected in the Dongda Mountain nature reserve of Hexi Corridor(39°00'-39°04' N, 100°45'-100°51' E)in April 2012.After the sample core is air-dried, the cross dating is carried out and the width chronology is established, the quality of dating is inspected by use of the COFECHA program.On the basis of the exact dating, the 4-5 sample cores with wider rings and fewer missing rings are selected for stripping year by year.The stripped sample is moved to the filter tube for the organic solvent extraction;subsequently, the sodium hypochlorite and acetic acid are used to remove the lignin;the sodium hydroxide solution is used to remove the hemicellulose;finally, the samples is homogenized by the ultrasonic cell crushing apparatus, and then it is dried and preserved after the freeze-drying in vacuum, so the alpha-cellulose is obtained.The cellulose samples is packaged into the sample by a silver capsule year by year, and then the Delta V Advantage stable isotope mass spectrometer is used to connect the high-temperature pyrolysis element analyzer(TC/EA)to determine the delta~(18)O value, and the delta~(18)O chronology sequence of tree ring is established.The meteorological data apply the Zhangye meteorological station data closest to the sampling point and the CRU3.10 grid points(38°-40°N, 99°-101°E)data information.The correlation coefficient between the tree ring delta~(18)O chronological table and the water vapor pressure is calculated, and the transformation equation between the tree ring delta~(18)O and the water vapor pressure has been established by using the linear regression model.The spatial correlation between the reconstructed sequence and the grid data is calculated through the web site at http://climexp.knmi.nl/.Results The water vapor pressure of the Dongda Mountain in July and August has a good correlation with the tree ring delta~(18)O chronology sequence, with the correlation coefficient reaches-0.643(p<0.001), and the change sequence of average water vapor pressure at the Dongda Mountain in July to August from 1807 to 2011 has been reconstructed, the variance interpretation of the reconstructed equation reaches 41.4%.
中文关键词	树轮delta~(18)O ; 水汽压重建 ; 东大山 ; 青海云杉
英文关键词	tree-ring delta~(18)O water vapor pressure reconstruction Dongda Mountain Picea crassifolia
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:6915310
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353391
作者单位	李强, 中国科学院地球环境研究所;;中国科学院第四纪科学与全球变化卓越创新中心;;全球变化研究协同创新中心, 黄土与第四纪地质国家重点实验室;;中国科学院第四纪科学与全球变化卓越创新中心;;全球变化研究协同创新中心, 西安;;西安;;, ;;;;北京 710061;;710061;;100875. 邓若兰, 长安大学水利与环境学院;;中国科学院地球环境研究所, 旱区地下水文与生态效应教育部重点实验室;;黄土与第四纪地质国家重点实验室, 西安;;西安, ;; 710054;;710061. 刘若时, 西安交通大学人居环境与建筑工程学院环境科学与技术系, 西安, 陕西 710049, 中国. 刘禹, 中国科学院地球环境研究所;;中国科学院第四纪科学与全球变化卓越创新中心;;全球变化研究协同创新中心;;西安交通大学人居环境与建筑工程学院环境科学与技术系, 黄土与第四纪地质国家重点实验室;;中国科学院第四纪科学与全球变化卓越创新中心;;全球变化研究协同创新中心;;, 西安;;西安;;;;西安, ;;;;北京;; 710061;;710061;;100875;;710049.
推荐引用方式 GB/T 7714	李强,邓若兰,刘若时,等. 树轮稳定氧同位素重建东大山过去205年来水汽压变化[J],2020,11(6):639-647.
APA	李强,邓若兰,刘若时,&刘禹.(2020).树轮稳定氧同位素重建东大山过去205年来水汽压变化.地球环境学报,11(6),639-647.
MLA	李强,et al."树轮稳定氧同位素重建东大山过去205年来水汽压变化".地球环境学报 11.6(2020):639-647.