LamontagneMargolisBauce2000

Référence

Lamontagne, M., Margolis, H.A. and Bauce, E. (2000) Testing the ecophysiological basis for the control of monoterpene concentrations along canopy profiles in thinned and unthinned balsam fir stands. Oecologia, 124(3):318-331.

Résumé

To determine which ecophysiological factors appear to control monoterpene concentrations in balsam fir foliage [Abies balsamea (L.) P. Mill.], the percentage of photosynthetically active radiation (PAR was negatively correlated with SLA (r(2)=0.62 in June, r(2)=0.53 in July and August) and positively correlated with foliar nitrogen concentrations (r(2)=0.51) within the crown profile. The positive relationship between N and A(max) was quite weak (r(2)=0.15), suggesting significant variations in non-photosynthetic N within the canopies. Total monoterpenes were positively correlated with both %PAR (r(2)=0.29) and A(max) (r(2)=0.27), and negatively correlated with SLA (r(2)=0.30). Contrary to that predicted by the carbon-nutrient balance hypothesis, total monoterpenes were negatively and only very weakly correlated with the starch/N ratio (r(2)=0.06) and were not significantly correlated with either the TSS/N or the [TSS+starch]/N ratios. Monoterpenes were positively correlated with both N and TSS, although the relationship varied with the phenological state of the folia,ae, i.e., monoterpenes were more highly correlated with TSS (r(2)=0.67) (immature foliage) in June, and in July and August with N (r(2)=0.63) (mature foliage). Thus, it appears that monoterpene concentrations may be controlled primarily by carbohydrate supply in the early growing season and later by enzymatic capacity. Data expressed on a dry weight basis showed a similar pattern.

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@ARTICLE { LamontagneMargolisBauce2000,
    AUTHOR = { Lamontagne, M. and Margolis, H.A. and Bauce, E. },
    TITLE = { Testing the ecophysiological basis for the control of monoterpene concentrations along canopy profiles in thinned and unthinned balsam fir stands },
    JOURNAL = { Oecologia },
    YEAR = { 2000 },
    VOLUME = { 124 },
    PAGES = { 318-331 },
    NUMBER = { 3 },
    NOTE = { 350FP Times Cited:9 Cited References Count:57 },
    ABSTRACT = { To determine which ecophysiological factors appear to control monoterpene concentrations in balsam fir foliage [Abies balsamea (L.) P. Mill.], the percentage of photosynthetically active radiation (PAR was negatively correlated with SLA (r(2)=0.62 in June, r(2)=0.53 in July and August) and positively correlated with foliar nitrogen concentrations (r(2)=0.51) within the crown profile. The positive relationship between N and A(max) was quite weak (r(2)=0.15), suggesting significant variations in non-photosynthetic N within the canopies. Total monoterpenes were positively correlated with both %PAR (r(2)=0.29) and A(max) (r(2)=0.27), and negatively correlated with SLA (r(2)=0.30). Contrary to that predicted by the carbon-nutrient balance hypothesis, total monoterpenes were negatively and only very weakly correlated with the starch/N ratio (r(2)=0.06) and were not significantly correlated with either the TSS/N or the [TSS+starch]/N ratios. Monoterpenes were positively correlated with both N and TSS, although the relationship varied with the phenological state of the folia,ae, i.e., monoterpenes were more highly correlated with TSS (r(2)=0.67) (immature foliage) in June, and in July and August with N (r(2)=0.63) (mature foliage). Thus, it appears that monoterpene concentrations may be controlled primarily by carbohydrate supply in the early growing season and later by enzymatic capacity. Data expressed on a dry weight basis showed a similar pattern. },
    KEYWORDS = { balsam fir carbon-nutrient balance light monoterpenes photosynthesis nitrogen-use efficiency spruce budworm growth leaf nitrogen photosynthetic capacity deciduous forest acer-saccharum abies-balsamea boreal forest elevated co2 light },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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