生态学报2017，Vol.37Issue(11)：3796-3804,9.DOI:10.5846/stxb201603170479
玉龙雪山3个针叶树种在海拔上限的径向生长及气候响应
Response of radial growth of three conifer species to climate at their respective upper distributional limits on Yulong snow Mountain
摘要
Abstract
The Northwestern Yunnan Plateau is located on the southeastern margin of the Tibetan Plateau,which is an area sensitive to climate change.In this area,forests have remained undisturbed due to their remote location,and many tree species have grown to their upper distributional limits.Accordingly,it is an ideal location for dendroclimatological study.Although some dendrochronological research has been carried out on the Northwestern Yunnan Plateau,few studies have been conducted on Yulong snow Mountain,which is a typical snow mountain and supports growth of the main tree species in the area.In order to detect the response of tree growth to climate change on the Northwestern Yunnan Plateau,we used the tree-ring width index of three major conifers,Abies georgei,Picea likiangensis,and Larix potaninii Batal var.macrocarpa Law,at their upper distributional limits on Yulong Snow Mountain.Specifically,we focused on the characteristics of residual chronologies and the relationships between radial growth and climatic factors (temperature and precipitation).We aimed to identify the main climatic factors limiting tree growth in the area and detect differences in growth responses to climate among the studied species.The following results were obtained (1) Temperature and precipitation were the main factors affecting tree growth at the upper distributional limits on Yulong snow Mountain,but the effects varied according to tree species.(2) The radial growth of L.potaninii Batal var.macrocarpa Law was mainly limited by temperature and precipitation during the early growing season (May-June) of the current year,and was positively and negatively correlated with temperature and precipitation in May and June,respectively.(3) Precipitation during the early growing season of the current year was the main factor limiting the radial growth of A.georgei,with a significantly negative correlation between the residual chronology and May-June precipitation,whereas higher temperature during the growing season (July-August) of the current year positively affected its growth.(4) The radial growth of P.likiangensis was mainly limited by climatic factors before the start of the growing season,showing a significantly negative correlation between growth and mean temperature of the previous December and current May,and a significantly positive correlation between growth and precipitation during the current January.Our research represents a reference tree-ring study of the Northwestern Yunnan Plateau,and can provide a scientific basis for climate reconstruction in the area.关键词
树木年轮/气候响应/海拔分布上限/滇西北高原Key words
dendrochronology/climatic response/upper distributional limit/Northwestern Yunnan Plateau引用本文复制引用
张卫国,肖德荣,田昆,陈广磊,和荣华,张贇..玉龙雪山3个针叶树种在海拔上限的径向生长及气候响应[J].生态学报,2017,37(11):3796-3804,9.基金项目
西南林业大学科研启动基金项目(111428) （111428）
云南省教育厅重点基金项目(2015Z136) （2015Z136）
云南省高原湿地科学创新团队(2012HC007) （2012HC007）
