中国西南地区川西云杉径向生长与水分利用效率动态变化（英文）

编号 zgly0001583960

文献类型 期刊论文

文献题名 中国西南地区川西云杉径向生长与水分利用效率动态变化（英文）

作者 汪洋  张永  方欧娅  邵雪梅 

作者单位 KeyLaboratoryofLandSurfacePatternandSimulation  InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  UniversityofChineseAcademyofSciences  StateKeyLaboratoryofVegetationandEnvironmentalChange  InstituteofBotany  CAS 

母体文献 Journal of Geographical Sciences 

年卷期 2018年06期

年份 2018 

分类号 S791.18 

关键词 treering  baselareaincrement  carbonisotope  intrinsicwater-useefficiency  CO2fertilization 

文摘内容 Elevated CO2 level in the atmosphere is expected to improve the tree growth rates and intrinsic water-use efficiency（i WUE）.Although current results inferring from tree rings found the tree growth decline in water-limited area,it is still unclear whether spruce trees in humid southwestern China benefit from the increasing CO2.In this study,tree-ring width data were used to investigate the tree radial growth rate of Chuanxi spruce（Picea likiangensis var.balfouriana）.Moreover,combining with the tree-ring carbon isotope date,we analyzed the physiological responses of Chuanxi spruce to rising CO2 concentrations in the atmosphere（Ca）associated with climatic change in southwestern China.From 1851 to 2009,i WUE of Chuanxi spruce rose by approximately 30.4%,and the ratio of atmospheric CO2 to leaf intercellular CO2 concentration（Ci/Ca）showed no significant trend in the study area.The result suggested that Chuanxi spruce used an active response strategy when Ca was significantly increased.i WUE showed a significant increasing trend in parallel with tree radial growth,indicating that the increasing i WUE resulted in an increase in radial growth.These results suggest that spruce forests in southwestern China have not shown declining trends under increasing Ca and climate change scenarios,in contrast to trees growing in water-limited areas.Therefore,spruce forests benefit from the increasing CO2 in the atmosphere in the humid areas of southwestern China.