摘要
树轮气候学是研究过去气候变化的重要手段之一。以往研究表明,树轮密度是生长季温度的重要代用资料。本文建立了祁连山西段青海云杉132~135年的树轮最大密度年表、树轮最小密度年表、树轮晚材平均密度年表和树轮早材平均密度年表,比较了不同密度年表指示的最优气候信号及其季节组合,评估了其作为气候代用资料的潜力与价值。结果表明:树轮晚材平均密度和树轮早材平均密度对于树木生长季气候信号的响应远低于树轮最大密度和树轮最小密度;树轮早材平均密度和树轮最小密度与帕尔默干旱指数有很强的联系,表明树轮早材平均密度和树轮最小密度有成为干旱代用指标的潜力。
Dendroclimatology is one of the important methods for studying climate changes in the past.Previous studies showed that tree-ring density is an important proxy for temperature in the growing season.In this study,we established 132-135 years chronologies of tree-ring maximum density,the minimum density,the latewood and the earlywood average density of Picea crassifolia at the western Qilian Mountains.We compared the climatic signal and its seasonal best combination of different tree-ring density chronologies,and evaluated their potential values as climate proxies.The responses of tree-ring latewood average density and the earlywood average density to climate signals during the growing season were much lower than that of tree-ring maximum and the minimum den-sity.The tree-ring earlywood average density and the minimum density had a strong relationship with the Palmer drought index,indicating that the earlywood average density and the minimum tree-ring density had the potential as substitute indicators for drought.
作者
杨柳
秦春
李刚
YANG Liu;QIN Chun;LI Gang(Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Enwironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Qilian Mountain National Nature Reserve Administration of Gansu Province,Zhangye 734000,Gansu,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2021年第10期3636-3642,共7页
Chinese Journal of Applied Ecology
基金
中国科学院西北生态环境资源研究院自主部署项目(E055020101,Y951971001)资助。
关键词
树轮密度
青海云杉
气候响应
生长季温度
极端干旱
tree-ring density
Picea crassifolia
climate response
growing season temperature
extreme drought
