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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
21/06/1999 |
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Data da última atualização: |
21/06/1999 |
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Autoria: |
CHEN, J. M.; BLACK, T. A. |
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Título: |
Measuring leaf area index of plant canopies with branch architecture. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Agricultural and Forest Meteorology, v.57, p.1-12, 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
Radiation transmission through plant canopies is shown to be determined not only by the geometry of the foliage elements, but also by the geometry of foliage clumps. When the geometry of tree branches was considered with a Poisson model, it was found that beam transmission measurements at a 62o rather than a 57.5o incident angle can provide a good estimate of the effective leaf area index (La). The values of La calculated from the model were approximately 55-65% of the actual leaf area index when the branches were assumed to consist of one layer of randomly dispersed leaves. The claculated results are consistent with experimental data obtained from a Douglas-fir forest stand, which was largely composed of near-horizontal branchers. |
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Palavras-Chave: |
IAF; Measuring leaf. |
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Thesagro: |
Área Foliar; Medição. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01223naa a2200181 a 4500
001 1055500
005 1999-06-21
008 1991 bl --- 0-- u #d
100 1 $aCHEN, J. M.
245 $aMeasuring leaf area index of plant canopies with branch architecture.
260 $c1991
520 $aRadiation transmission through plant canopies is shown to be determined not only by the geometry of the foliage elements, but also by the geometry of foliage clumps. When the geometry of tree branches was considered with a Poisson model, it was found that beam transmission measurements at a 62o rather than a 57.5o incident angle can provide a good estimate of the effective leaf area index (La). The values of La calculated from the model were approximately 55-65% of the actual leaf area index when the branches were assumed to consist of one layer of randomly dispersed leaves. The claculated results are consistent with experimental data obtained from a Douglas-fir forest stand, which was largely composed of near-horizontal branchers.
650 $aÁrea Foliar
650 $aMedição
653 $aIAF
653 $aMeasuring leaf
700 1 $aBLACK, T. A.
773 $tAgricultural and Forest Meteorology$gv.57, p.1-12, 1991.
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| Registros recuperados : 77 | |
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