应用生态学报2017，Vol.28Issue(7)：2128-2134,7.DOI:10.13287/j.1001-9332.201707.013
基于树轮δ13C的北京山区侧柏水分利用效率
Tree-ring δ13C and water use efficiency of Platycladus orientalis in mountains of Beijing
摘要
Abstract
Water use efficiency (WUE) is different among species and regions.Few literatures have been reviewed related to long-term WUE of Platycladus orientalis in mountainous areas of Beijing,China.Tree-ring δ13C of P.orientalis was used to determine the long-term variation of annual intrinsic water use efficiency (WUEi) and its response to environmental change.Combining with quantification of tree-ring width,the relationship between net carbon sequestration and WUEi of P.orientalis was eventually explored.The results showed that mean annual temperature increased with the increase of time from 1918 to 2013,whereas annual precipitation fiercely fluctuated.Tree-ring δ13C decreased and WUEi increased over time.WUEi was positively related and more sensitive to air temperature increasing than temperature decreasing.Correlation between WUEi and fluctuated annual precipitation was ambiguous,which indicated the precipitation was not the main factor affecting WUEi.The de-trend tree-ring width of P.orientalis increased initially and then decreased,especially in recent 20 years.According to the correlation between WUEi and environmental factors,temperature resulted in stomatal conductance (gs) decreasing,which caused a reduction in evapotranspiration and an increase in respiratory loss,leading to the increase of WUEi and a down trend in net carbon sequestration and tree growth.关键词
树轮稳定碳同位素值/水分利用效率/树轮宽度/气孔导度Key words
tree-ring stable carbon isotope/water use efficiency/tree-ring width/stomatal conductance引用本文复制引用
路伟伟,余新晓,贾国栋,李瀚之,刘自强..基于树轮δ13C的北京山区侧柏水分利用效率[J].应用生态学报,2017,28(7):2128-2134,7.基金项目
本文由国家自然科学基金项目(41430747)和科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(PXM2016_014207_000038)资助 This work was supported by the National Natural Science Foundation of China (41430747)and Technological and Innovation Systems and Service Capacity Building-Collaborative Innovation Center-Fruit Industry Ecological Environment Function to Enhance the Collaborative Innovation Center (PXM2016_014207_000038). （41430747）
