DangMargolisSyEtAl1997

Reference

Dang, Q.L., Margolis, H.A., Sy, M., Coyea, M.R., Collatz, G.J., Walthall, C.L. (1997) Profiles of photosynthetically active radiation, nitrogen and photosynthetic capacity in the boreal forest: Implications for scaling from leaf to canopy. Journal of Geophysical Research: Atmospheres, 102(D24):28845-28859.

Abstract

Profiles of photosynthetically active radiation (PAR), leaf nitrogen per unit leaf area (N-area), and photosynthetic capacity (A(max)) were measured in an aspen, two jack pine, and two black spruce stands in the BOREAS northern study area. N-area decreased with decreasing PAR than did aspen early in the growing season. A(max) decreased with decreasing N-area except for the negative correlation between N-area and A(max) during shoot flush for jack pine. For the middle and late growing season data, N-area and A(max) had r values of 0.51 for all stands combined and 0.60 for all conifer stands combined. For similar N-area the aspen stand had higher A(max) than did the conifer stands. Photosynthetic capacity expressed as a percentage of A(max) at the top of the canopy (PAR similarly in all stands, but PAR. To demonstrate the implications of the vertical distribution of A(max), three different assumptions were used to scale leaf A(max) to the canopy (A(can-max)): (1) constant A(max) with canopy depth, (2) A(max) scaled proportionally to %PAR, and (3) a linear relationship between A(max) and cumulative leaf area index derived from our data. The first and third methods resulted in similar A(can-max); the second was much lower. All methods resulted in linear correlations between normalized difference vegetation indices measured from a helicopter and A(can-max) (r = 0.97, 0.93, and 0.97, respectively), but the slope was strongly influenced by the scaling method.

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@ARTICLE { DangMargolisSyEtAl1997,
    AUTHOR = { Dang, Q.L. and Margolis, H.A. and Sy, M. and Coyea, M.R. and Collatz, G.J. and Walthall, C.L. },
    TITLE = { Profiles of photosynthetically active radiation, nitrogen and photosynthetic capacity in the boreal forest: Implications for scaling from leaf to canopy },
    JOURNAL = { Journal of Geophysical Research: Atmospheres },
    YEAR = { 1997 },
    VOLUME = { 102 },
    PAGES = { 28845-28859 },
    NUMBER = { D24 },
    NOTE = { Times Cited: 46 },
    ABSTRACT = { Profiles of photosynthetically active radiation (PAR), leaf nitrogen per unit leaf area (N-area), and photosynthetic capacity (A(max)) were measured in an aspen, two jack pine, and two black spruce stands in the BOREAS northern study area. N-area decreased with decreasing PAR than did aspen early in the growing season. A(max) decreased with decreasing N-area except for the negative correlation between N-area and A(max) during shoot flush for jack pine. For the middle and late growing season data, N-area and A(max) had r values of 0.51 for all stands combined and 0.60 for all conifer stands combined. For similar N-area the aspen stand had higher A(max) than did the conifer stands. Photosynthetic capacity expressed as a percentage of A(max) at the top of the canopy (PAR similarly in all stands, but PAR. To demonstrate the implications of the vertical distribution of A(max), three different assumptions were used to scale leaf A(max) to the canopy (A(can-max)): (1) constant A(max) with canopy depth, (2) A(max) scaled proportionally to %PAR, and (3) a linear relationship between A(max) and cumulative leaf area index derived from our data. The first and third methods resulted in similar A(can-max); the second was much lower. All methods resulted in linear correlations between normalized difference vegetation indices measured from a helicopter and A(can-max) (r = 0.97, 0.93, and 0.97, respectively), but the slope was strongly influenced by the scaling method. },
    KEYWORDS = { WATER-USE EFFICIENCY; GAS-EXCHANGE; AREA INDEX; STOMATAL CONDUCTANCE; LEAVES; LIGHT; TRANSPIRATION; PLANTS; STAND; FOLIAGE },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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