Altitudinal differences in the leaf fitness of juvenile and mature alpine spruce trees (Picea crassifolia)

NWIPB OpenIR

	Altitudinal differences in the leaf fitness of juvenile and mature alpine spruce trees (Picea crassifolia)
	Zhao, Changaling 1; Chen, Litong 1; Ma, Fei 1; Yao, Buqing 1; Liu, Jianquan 1,2
	2008
发表期刊	TREE PHYSIOLOGY
卷号	28 期号:1 页码:133-141
文章类型	Article
摘要	In many plant species, leaf morphology varies with altitude, an effect that has been attributed to temperature. It remains uncertain whether such a trend applies equally to juvenile and mature trees across altitudinal gradients in semi-arid mountain regions. We examined altitude-related differences in a variety of needle characteristics of juvenile (2-m tall) and mature (5-m tall) alpine spruce (Picea crassifolia Kom.) trees growing at altitudes between 2501 and 3450 m in the Qilian Mountains of northwest China. We found that stable carbon isotope composition (delta C-13), area- and mass-based leaf nitrogen concentration (N-a, N-m), number of stomata per gram of nitrogen (St/N), number of stomata per unit leaf mass (St/LM), projected leaf area per 100 needles (LA) and leaf mass per unit area (LMA) varied nonlinearly with altitude for both juvenile and mature trees, with a relationship reversal point at about 3 100 m. Stomatal density (SD) of juvenile trees remained unchanged with altitude, whereas SD and stomatal number per unit length (SNL) of mature spruce initially increased with altitude, but subsequently decreased. Although several measured indices were generally found to be higher in mature trees than in juvenile trees, N-m, leaf carbon concentration (C.), leaf water concentration. (LWC), St/N, LA and St/LM showed inconsistent differences between trees of different ages along the altitudinal gradient. In both juvenile and mature trees, VC correlated significantly with LMA, N-m, N-a, SNL, St/LM and St/N. Stomatal density, LWC and LA were only significantly correlated with delta C-13 in mature trees. These findings suggest that there are distinct ecophysiological differences between the needles of juvenile and mature trees that determine their response to changes in altitude in semi-arid mountainous regions. Variations in the fitness of forests of different ages may have important implications for modeling forest responses to changes in environmental conditions, such as predicted future temperature increases in high attitude areas associated with climate change.; In many plant species, leaf morphology varies with altitude, an effect that has been attributed to temperature. It remains uncertain whether such a trend applies equally to juvenile and mature trees across altitudinal gradients in semi-arid mountain regions. We examined altitude-related differences in a variety of needle characteristics of juvenile (2-m tall) and mature (5-m tall) alpine spruce (Picea crassifolia Kom.) trees growing at altitudes between 2501 and 3450 m in the Qilian Mountains of northwest China. We found that stable carbon isotope composition (delta C-13), area- and mass-based leaf nitrogen concentration (N-a, N-m), number of stomata per gram of nitrogen (St/N), number of stomata per unit leaf mass (St/LM), projected leaf area per 100 needles (LA) and leaf mass per unit area (LMA) varied nonlinearly with altitude for both juvenile and mature trees, with a relationship reversal point at about 3 100 m. Stomatal density (SD) of juvenile trees remained unchanged with altitude, whereas SD and stomatal number per unit length (SNL) of mature spruce initially increased with altitude, but subsequently decreased. Although several measured indices were generally found to be higher in mature trees than in juvenile trees, N-m, leaf carbon concentration (C.), leaf water concentration. (LWC), St/N, LA and St/LM showed inconsistent differences between trees of different ages along the altitudinal gradient. In both juvenile and mature trees, VC correlated significantly with LMA, N-m, N-a, SNL, St/LM and St/N. Stomatal density, LWC and LA were only significantly correlated with delta C-13 in mature trees. These findings suggest that there are distinct ecophysiological differences between the needles of juvenile and mature trees that determine their response to changes in altitude in semi-arid mountainous regions. Variations in the fitness of forests of different ages may have important implications for modeling forest responses to changes in environmental conditions, such as predicted future temperature increases in high attitude areas associated with climate change.
关键词	Altitude Carbon Isotope Ecophysiology Morphology Tree Age
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	林业
关键词[WOS]	CARBON-ISOTOPE DISCRIMINATION ; WATER-USE EFFICIENCY ; HAWAIIAN METROSIDEROS-POLYMORPHA ; PHOTOSYNTHETIC RATES ; STOMATAL DENSITY ; ATMOSPHERIC CO2 ; HYDRAULIC LIMITATION ; PINUS-SYLVESTRIS ; CLIMATE-CHANGE ; GAS-EXCHANGE
收录类别	SCI
语种	英语
WOS研究方向	Forestry
WOS类目	Forestry
WOS记录号	WOS:000252571800015
引用统计	被引频次：43[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1237
专题	中国科学院西北高原生物研究所
作者单位	1.Lanzhou Univ, Sch Life Sci, Minist Educ, Key Lab Arid & Grassland Ecol, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, NW Plateau Inst Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Changaling,Chen, Litong,Ma, Fei,et al. Altitudinal differences in the leaf fitness of juvenile and mature alpine spruce trees (Picea crassifolia)[J]. TREE PHYSIOLOGY,2008,28(1):133-141.
APA	Zhao, Changaling,Chen, Litong,Ma, Fei,Yao, Buqing,&Liu, Jianquan.(2008).Altitudinal differences in the leaf fitness of juvenile and mature alpine spruce trees (Picea crassifolia).TREE PHYSIOLOGY,28(1),133-141.
MLA	Zhao, Changaling,et al."Altitudinal differences in the leaf fitness of juvenile and mature alpine spruce trees (Picea crassifolia)".TREE PHYSIOLOGY 28.1(2008):133-141.

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