Growing season extension does not lead to uniform growth response in Qinghai spruceOA
Mountain forests experience some of the strongest impacts of global warming among terrestrial ecosystems,particularly due to exacerbated warming-induced moisture deficits.Previous tree-ring width-based studies have sometimes yielded controversial perspectives on historical and projected relationships between tree growth and climate,likely also due to underestimation of the effects of alteration in the thermal growing season.Here,we established a tree-ring network of Qinghai spruce(Picea crassifoliaKom.)across the northeastern Qinghai-Tibet Plateau,and applied a generalized additive model(GAM)framework with temporally flexible and physiologically relevant climate series to(i)assess species’climate-dependent growth dynamics and(ii)project its future(2021-2060)growth trend.Over the generated site-specific optimal growth thermal range(OGTR),our results revealed an obvious upward trend of growing season length,mean temperature,and total precipitation.Specifically,the extension of growing season length was characterized by both earlier start and later end of the anchoring dates.Meanwhile,the temporal dynamics of growth-climate relationships at most sampling sites indicated that drought limitation on Qinghai spruce has weakened in recent decades.Following episodic extreme drought events,trees can recover their growth to pre-drought levels within no more than four years.Model projections suggest that tree growth will benefit from future climate changes and facilitate forest carbon sequestration at the species-level.However,growth changes will not be uniform across the species’distribution range,particularly the westernmost populations,which are projected to experience a decline in growth.Overall,this study provides new insight into how mountain conifers respond to concurrent warming and moisture changes.
Dele Hou;Yihui Qin;Ziqing Zhang;Yun Zhao;Wen Lin;Xiaohua Gou;Yongle Chen
Key Laboratory of Western China''s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China Gansu Liancheng Forest Ecosystem Field Observation and Research Station,Lanzhou University,Lanzhou 730333,ChinaKey Laboratory of Western China''s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China Gansu Liancheng Forest Ecosystem Field Observation and Research Station,Lanzhou University,Lanzhou 730333,ChinaKey Laboratory of Western China''s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China Gansu Liancheng Forest Ecosystem Field Observation and Research Station,Lanzhou University,Lanzhou 730333,ChinaCollege of Environmental Science and Forestry,State University of New York,Syracuse,NY 13210,USACollege of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,ChinaKey Laboratory of Western China''s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China Gansu Liancheng Forest Ecosystem Field Observation and Research Station,Lanzhou University,Lanzhou 730333,ChinaKey Laboratory of Western China''s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China Gansu Liancheng Forest Ecosystem Field Observation and Research Station,Lanzhou University,Lanzhou 730333,China
农业科技
Climate changeGrowing seasonDrought eventsGrowth projectionPicea crassifoliaQinghai-Tibet Plateau
《Forest Ecosystems》 2026 (2)
P.494-505,12
supported by the National Natural Science Foundation of China(Grant Nos.42377450,42430503,and 32371572).
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