DOI: 10.1016/j.foreco.2014.03.036
Scopus记录号: 2-s2.0-84936761185
论文题名: Ecophysiological responses of two dominant subalpine tree species Betula albo-sinensis and Abies faxoniana to intra- and interspecific competition under elevated temperature
作者: Duan B. ; Dong T. ; Zhang X. ; Zhang Y. ; Chen J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 323 起始页码: 20
结束页码: 27
语种: 英语
英文关键词: Competition
; Nitrogen uptake
; Photosynthesis capacity
; Temperature
; Water-use efficiency
Scopus关键词: Carbon
; Competition
; Efficiency
; Isotopes
; Mixtures
; Nitrogen
; Photosynthesis
; Plants (botany)
; Seed
; Temperature
; Carbon isotope composition
; Chlorophyll fluorescence parameters
; Inter-specific competitions
; Intraspecific competition
; Light-saturated photosynthetic rate
; Nitrogen uptake
; Relative height growth rates
; Water use efficiency
; Forestry
; carbon balance
; chlorophyll
; coniferous tree
; deciduous tree
; ecophysiology
; fluorescence
; growth rate
; high temperature
; interspecific competition
; intraspecific competition
; isotopic composition
; monoculture
; nutrient uptake
; photosynthesis
; respiration
; seedling
; subalpine environment
; temperature tolerance
; water use efficiency
英文摘要: Seedlings of tree species Abies faxoniana and Betula albo-sinensis were grown under different competition regimes (single plant, monoculture or mixture) at ambient temperature (AT) and elevated temperature (ET) to evaluate the impact of inter- and intraspecific competition on photosynthesis capacity, N resorption efficiency, N uptake patterns, water use efficiency (foliar carbon isotope composition, δ13C) and root carbon reserve accumulation. Our results showed that ET did not have significant effects on relative height growth rate (RGRH ), relative diameter growth rate (RGRD ), chlorophyll fluorescence parameters (Fv /Fm , ΦPSII ), light-saturated photosynthetic rate (A1400 ) and nitrogen uptake in A. faxoniana, but it significantly reduced the values of these parameters in B. albo-sinensis. On the other hand, RGRH of A. faxoniana was not influenced by intraspecific competition irrespective of temperature regimes, while in B. albo-sinensis intraspecific competition was severer under AT than under ET. Decreased photosynthetic capacity and reduced plant size detected in B. albo-sinensis under ET likely contribute to its low intraspecific competitive ability. However, we found positive effects of interspecific competition on A. faxoniana but negative effects on B. albo-sinensis under ET, as A. faxoniana exposed to interspecific competition showed higher RGRH , RGRD , A1400 , chlorophyll fluorescence parameters, foliar δ13C, foliar N, and percentages of 15N-ammonium and 15N-nitrate recovery than did A. faxoniana exposed to intraspecific competition or no competition. The results indicate that A. faxoniana is a better competitor than B. albo-sinensis under ET. Further, A. faxoniana altered resource use patterns and had a high plasticity in its ammonium uptake in mixtures compared with monocultures under ET, while B. albo-sinensis did not change its N use pattern. In all, our results showed that high temperature stress tolerance (e.g., higher root carbon accumulation), high ability to keep carbon balance (e.g., higher water use efficiency, lower leaf respiration rate, higher Fv /Fm ), as well as a better N acquisition ability make A. faxoniana a better competitor when compared to B. albo-sinensisg under ET. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65973
Appears in Collections: 影响、适应和脆弱性
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作者单位: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; Chengdu Institute of Biology, Chinese Academy of Sciences, PO Box 416, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100039, China; Mianyang Normal University, Ecological Security and Protection Key Laboratory of Sichuan Province, Mianyang 621010, China
Recommended Citation:
Duan B.,Dong T.,Zhang X.,et al. Ecophysiological responses of two dominant subalpine tree species Betula albo-sinensis and Abies faxoniana to intra- and interspecific competition under elevated temperature[J]. Forest Ecology and Management,2014-01-01,323