Age-dependent impacts of climate change and intrinsic water-use efficiency on the growth of Schrenk spruce (Picea schrenkiana) in the western Tianshan Mountains, China

doi:10.1016/j.foreco.2018.02.008

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Age-dependent impacts of climate change and intrinsic water-use efficiency on the growth of Schrenk spruce (Picea schrenkiana) in the western Tianshan Mountains, China
	We, Guoju 1,2; Liu, Xiaohong 1,3; Kang, Shichang 1; Chen, Tuo 1; Xu, Guobao 1; Zeng, Xiaomin 1,3; Wang, Wenzhi4 ; Wang, Bo 1,2; Zhang, Xuanwen 1,2; Kang, Huhu 1,2
刊名	FOREST ECOLOGY AND MANAGEMENT
	2018-04-15
卷号	414 页码:1-14
关键词	Cambial age Radial growth Intrinsic water-use efficiency (iWUE) Climate warming CO2 fertilization
ISSN号	0378-1127
DOI	10.1016/j.foreco.2018.02.008
英文摘要	Rising atmospheric CO2 (C-a) can increase tree radial growth by increasing intrinsic water-use efficiency (iWUE). However, the effects of age on the response remain unknown, particularly for forests in remote areas such as China's Tianshan Mountains. Here, we assessed age-dependent growth trends of Picea schrenkiana using tree-ring data from low and high elevations and two detrending methods to detect robust long-term trends. We developed age-dependent relationships between basal area increment (BAI) and IWUE based on size-class isolation and separated the contributions of climate variables and iWUE to radial growth. The juvenile trees showed growth increases over time, versus growth reductions in two older age classes. An overall negative trend existed for combined data from all age classes and elevations. iWUE increased in response to increasing C-a for trees in all age groups at low and high elevations, with higher values in near-mature and mature trees (100 yr < age <= 160 yr) at the lower sites. However, age affected radial growth and its responses to climate and iWUE. For juvenile trees (<= 60 yr), BAI increased during the study period, temperature in May-July and iWUE all have positive effects on the radial growth with significantly high contribution variance from iWUE. The smaller hydraulic constraints in juvenile trees may permit higher photosynthetic rates, reduced climatic sensitivity, and increased growth by CO2 fertilization. For older trees, BAI decreased, possibly due to stomatal closure caused by warmer temperatures and decreasing hydraulic efficiency with increasing tree age; thus, increased iWUE could not outweigh environmental stresses, The trees at high and low elevations responded consistently to environmental changes, but with different response intensity. Thus, climate and cambial age together determined whether increased iWUE could increase radial growth and the potential CO2 fertilization effect. These age dependent growth responses should be accounted for when assessing responses of forest dynamics to climate change.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000428103600001
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/22532]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Liu, Xiaohong
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Shaanxi, Peoples R China 4.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Environm Evolut & Regulat, Chengdu 610041, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	We, Guoju,Liu, Xiaohong,Kang, Shichang,et al. Age-dependent impacts of climate change and intrinsic water-use efficiency on the growth of Schrenk spruce (Picea schrenkiana) in the western Tianshan Mountains, China[J]. FOREST ECOLOGY AND MANAGEMENT,2018,414:1-14.
APA	We, Guoju.,Liu, Xiaohong.,Kang, Shichang.,Chen, Tuo.,Xu, Guobao.,...&Kang, Huhu.(2018).Age-dependent impacts of climate change and intrinsic water-use efficiency on the growth of Schrenk spruce (Picea schrenkiana) in the western Tianshan Mountains, China.FOREST ECOLOGY AND MANAGEMENT,414,1-14.
MLA	We, Guoju,et al."Age-dependent impacts of climate change and intrinsic water-use efficiency on the growth of Schrenk spruce (Picea schrenkiana) in the western Tianshan Mountains, China".FOREST ECOLOGY AND MANAGEMENT 414(2018):1-14.