Tree radial growth can have significantly differ-ent responses to climate change depending on the environ-ment.To elucidate the effects of climate on radial growth and stable carbon isotope(δ^(13)C)fractionation of Q...Tree radial growth can have significantly differ-ent responses to climate change depending on the environ-ment.To elucidate the effects of climate on radial growth and stable carbon isotope(δ^(13)C)fractionation of Qing-hai spruce(Picea crassifolia),a widely distributed native conifer in northwestern China in different environments,we developed chronologies for tree-ring widths and δ^(13)C in trees on the southern and northern slopes of the Qilian Mountains,and analysed the relationship between these tree-ring variables and major climatic factors.Tree-ring widths were strongly influenced by climatic factors early in the growing season,and the radial growth in trees on the northern slopes was more sensitive to climate than in trees on the southern.Tree-ring δ^(13)C was more sensitive to climate than radial growth.δ^(13)C fractionation was mainly influenced by summer temperature and precipitation early in the growing season.Stomatal conductance more strongly limited stable carbon isotope fractionation in tree rings than photosynthetic rate did.The response between tree rings and climate in mountains gradually weakened as climate warmed.Changes in radial growth and stable carbon isotope fractionation of P.crassifolia in response to climate in the Qilian Mountains may be further complicated by continued climate change.展开更多
By using a single-year discrimination chronology detrended from a δ13C chronology from Chinese pine (Pinus tabulaeformis) tree rings and meteorological data, the δ13C-climatic response is analyzed. The results show ...By using a single-year discrimination chronology detrended from a δ13C chronology from Chinese pine (Pinus tabulaeformis) tree rings and meteorological data, the δ13C-climatic response is analyzed. The results show that high-frequency δ13C is significantly related to both temperatures of June (with r=-0.65) and the total precipitation of May, June and July (r=-0.46). This suggests that δ13C records reflects some features of the East Asian summer monsoon. In addition, temperature departure for June is reconstructed from a transfer function developed with δ13C-climatic response.展开更多
基金supported by Basic Research Operating Expenses of the Central level Non-profit Research Institutes (IDM2022003)National Natural Science Foundation of China (42375054)+2 种基金Regional collaborative innovation project of Xinjiang (2021E01022,2022E01045)Young Meteorological Talent Program of China Meteorological Administration,Tianshan Talent Program of Xinjiang (2022TSYCCX0003)Youth Innovation Team of China Meteorological Administration (CMA2023QN08).
文摘Tree radial growth can have significantly differ-ent responses to climate change depending on the environ-ment.To elucidate the effects of climate on radial growth and stable carbon isotope(δ^(13)C)fractionation of Qing-hai spruce(Picea crassifolia),a widely distributed native conifer in northwestern China in different environments,we developed chronologies for tree-ring widths and δ^(13)C in trees on the southern and northern slopes of the Qilian Mountains,and analysed the relationship between these tree-ring variables and major climatic factors.Tree-ring widths were strongly influenced by climatic factors early in the growing season,and the radial growth in trees on the northern slopes was more sensitive to climate than in trees on the southern.Tree-ring δ^(13)C was more sensitive to climate than radial growth.δ^(13)C fractionation was mainly influenced by summer temperature and precipitation early in the growing season.Stomatal conductance more strongly limited stable carbon isotope fractionation in tree rings than photosynthetic rate did.The response between tree rings and climate in mountains gradually weakened as climate warmed.Changes in radial growth and stable carbon isotope fractionation of P.crassifolia in response to climate in the Qilian Mountains may be further complicated by continued climate change.
基金Project supported by the National Natural Science Foundation of China and US National Oceanic and Atmospheric Administration.
文摘By using a single-year discrimination chronology detrended from a δ13C chronology from Chinese pine (Pinus tabulaeformis) tree rings and meteorological data, the δ13C-climatic response is analyzed. The results show that high-frequency δ13C is significantly related to both temperatures of June (with r=-0.65) and the total precipitation of May, June and July (r=-0.46). This suggests that δ13C records reflects some features of the East Asian summer monsoon. In addition, temperature departure for June is reconstructed from a transfer function developed with δ13C-climatic response.
