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Registro Completo |
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
05/07/2013 |
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Data da última atualização: |
05/07/2013 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
HUNTER, M. O.; KELLER, M.; VICTORIA, D. de C.; MORTON, D. C. |
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Afiliação: |
M. O. HUNTER, UNIVERSITY OF NEW HAMPSHIRE; MICHAEL KELLER, USDA FOREST SERVICE INTERNATIONAL INSTITUTE OF TROPICAL FORESTRY; DANIEL DE CASTRO VICTORIA, CNPM; D. C. MORTON, NASA. |
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Título: |
Tree height and tropical forest biomass estimation. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Biogeosciences, v. 10, p. 10491-10529, 2013. |
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Páginas: |
p. 10491-10529. |
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DOI: |
10.5199/bgd-10-10491-2013 |
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Idioma: |
Inglês |
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Conteúdo: |
Tropical forests account for approximately half of above-ground carbon stored in global vegetation. However, uncertainties in tropical forest carbon stocks remain high because it is costly and laborious to quantify standing carbon stocks. Carbon stocks of tropi-5 cal forests are determined using allometric relations between tree stem diameter and height and biomass. Previous work has shown that the inclusion of height in biomass allometries, compared to the sole use of diameter, significantly improves biomass estimation accuracy. Here, we evaluate the effect of height measurement error on biomass estimation and we evaluate the accuracy of recently published diameter : height allome10 tries at four sites within the Brazilian Amazon. As no destructive sample of biomass was available at these sites, reference biomass values were based on allometries.We found that the precision of individual tree height measurements ranged from 3 to 20% of total height. This imprecision resulted in a 5?6% uncertainty in biomass when scaled to 1 ha transects. Individual height measurement may be replaced with existing regional 15 and global height allometries. However, we recommend caution when applying these relations. At Tapajós National Forest in the Brazilian state of Pará, using the pantropical and regional allometric relations for height resulted in site biomass 26% to 31% less than reference values. At the other three study sites, the pan-tropical equation resulted in errors of less that 2 %, and the regional allometry produced errors of less than 20 12%. As an alternative to measuring all tree heights or to using regional and pantropical relations, we recommend measuring height for a well distributed sample of about 100 trees per site. Following this methodology, 95% confidence intervals of transect biomass were constrained to within 4.5% on average when compared to reference values. MenosTropical forests account for approximately half of above-ground carbon stored in global vegetation. However, uncertainties in tropical forest carbon stocks remain high because it is costly and laborious to quantify standing carbon stocks. Carbon stocks of tropi-5 cal forests are determined using allometric relations between tree stem diameter and height and biomass. Previous work has shown that the inclusion of height in biomass allometries, compared to the sole use of diameter, significantly improves biomass estimation accuracy. Here, we evaluate the effect of height measurement error on biomass estimation and we evaluate the accuracy of recently published diameter : height allome10 tries at four sites within the Brazilian Amazon. As no destructive sample of biomass was available at these sites, reference biomass values were based on allometries.We found that the precision of individual tree height measurements ranged from 3 to 20% of total height. This imprecision resulted in a 5?6% uncertainty in biomass when scaled to 1 ha transects. Individual height measurement may be replaced with existing regional 15 and global height allometries. However, we recommend caution when applying these relations. At Tapajós National Forest in the Brazilian state of Pará, using the pantropical and regional allometric relations for height resulted in site biomass 26% to 31% less than reference values. At the other three study sites, the pan-tropical equation resulted in errors of less that 2... Mostrar Tudo |
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Palavras-Chave: |
Carbon stocks. |
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Thesaurus Nal: |
Biomass. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/85535/1/Hunter-et-al-Biogeosciences-Discussions-2013.pdf
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Marc: |
LEADER 02471naa a2200205 a 4500
001 1961496
005 2013-07-05
008 2013 bl uuuu u00u1 u #d
024 7 $a10.5199/bgd-10-10491-2013$2DOI
100 1 $aHUNTER, M. O.
245 $aTree height and tropical forest biomass estimation.$h[electronic resource]
260 $c2013
300 $ap. 10491-10529.
520 $aTropical forests account for approximately half of above-ground carbon stored in global vegetation. However, uncertainties in tropical forest carbon stocks remain high because it is costly and laborious to quantify standing carbon stocks. Carbon stocks of tropi-5 cal forests are determined using allometric relations between tree stem diameter and height and biomass. Previous work has shown that the inclusion of height in biomass allometries, compared to the sole use of diameter, significantly improves biomass estimation accuracy. Here, we evaluate the effect of height measurement error on biomass estimation and we evaluate the accuracy of recently published diameter : height allome10 tries at four sites within the Brazilian Amazon. As no destructive sample of biomass was available at these sites, reference biomass values were based on allometries.We found that the precision of individual tree height measurements ranged from 3 to 20% of total height. This imprecision resulted in a 5?6% uncertainty in biomass when scaled to 1 ha transects. Individual height measurement may be replaced with existing regional 15 and global height allometries. However, we recommend caution when applying these relations. At Tapajós National Forest in the Brazilian state of Pará, using the pantropical and regional allometric relations for height resulted in site biomass 26% to 31% less than reference values. At the other three study sites, the pan-tropical equation resulted in errors of less that 2 %, and the regional allometry produced errors of less than 20 12%. As an alternative to measuring all tree heights or to using regional and pantropical relations, we recommend measuring height for a well distributed sample of about 100 trees per site. Following this methodology, 95% confidence intervals of transect biomass were constrained to within 4.5% on average when compared to reference values.
650 $aBiomass
653 $aCarbon stocks
700 1 $aKELLER, M.
700 1 $aVICTORIA, D. de C.
700 1 $aMORTON, D. C.
773 $tBiogeosciences$gv. 10, p. 10491-10529, 2013.
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Embrapa Territorial (CNPM) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Unidades Centrais. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
10/05/2002 |
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Data da última atualização: |
20/07/2009 |
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Autoria: |
COSENZA, G. W.; ANDRADE, R. P. de; GOMES, D. T.; ROCHA, C. M. C. da. |
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Título: |
Resistência de Gramíneas Forrageiras à Cigarrinha-da-Pastagens. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, v.24, n.8; p. 961-968 ago. 1989. |
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Idioma: |
Português |
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Conteúdo: |
Testou-se o nível de resistência de gramíneas forrageiras à cigarrinha-das-pastagens, Deois flavopicta (Stal 1854), em condições de campo. Os capins mais resistentes foram: Andropogon gayanus cv. Planaltina, Brachiaria brimntha cv. Marandu, Cynodon plectostachyus (estrela), Hiparrhenia rufa Uaraguá) e Panicum maxímum cv. Tobiatã. Os mais suscetíveis foram o Brachiaria ruzizienss e o Brachiaria decumbens. Foram desenvolvidos testes para determinação do mecanismo de resistência e da base da resistência de dez gramíneas, em gaiolas teladas e em laboratório. Os mecanismos de resistência do C. pletostachyus e H. rufa são, provavelmente, a antixenose e a antibiose; A. gayanus e B. brizantha cv. Marandu apresentam, provavelmente, antixenose, antibiose e tolerância; P. maximum cv. Tobiatã e o B. humidicola, tolerância; B. decumbens e B. ruziziensis mostraram ser suscetíveis, e não apresentaram qualquer mecanismo de resistência. 0 manejo das pastagens mostrou ser fator importante para controlar a cigarrinha. Conservar mais altos os pastos de gramíneas suscetíveis durante a época da cigarrinha e usar os capins resistentes durante esse período demonstrou ser procedimento eficaz no controle da praga.
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Palavras-Chave: |
controle. |
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Thesagro: |
Andropogon Gayanus; Brachiaria; Deois Flavopicta. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01822naa a2200205 a 4500
001 1107158
005 2009-07-20
008 1989 bl uuuu u00u1 u #d
100 1 $aCOSENZA, G. W.
245 $aResistência de Gramíneas Forrageiras à Cigarrinha-da-Pastagens.
260 $c1989
520 $aTestou-se o nível de resistência de gramíneas forrageiras à cigarrinha-das-pastagens, Deois flavopicta (Stal 1854), em condições de campo. Os capins mais resistentes foram: Andropogon gayanus cv. Planaltina, Brachiaria brimntha cv. Marandu, Cynodon plectostachyus (estrela), Hiparrhenia rufa Uaraguá) e Panicum maxímum cv. Tobiatã. Os mais suscetíveis foram o Brachiaria ruzizienss e o Brachiaria decumbens. Foram desenvolvidos testes para determinação do mecanismo de resistência e da base da resistência de dez gramíneas, em gaiolas teladas e em laboratório. Os mecanismos de resistência do C. pletostachyus e H. rufa são, provavelmente, a antixenose e a antibiose; A. gayanus e B. brizantha cv. Marandu apresentam, provavelmente, antixenose, antibiose e tolerância; P. maximum cv. Tobiatã e o B. humidicola, tolerância; B. decumbens e B. ruziziensis mostraram ser suscetíveis, e não apresentaram qualquer mecanismo de resistência. 0 manejo das pastagens mostrou ser fator importante para controlar a cigarrinha. Conservar mais altos os pastos de gramíneas suscetíveis durante a época da cigarrinha e usar os capins resistentes durante esse período demonstrou ser procedimento eficaz no controle da praga.
650 $aAndropogon Gayanus
650 $aBrachiaria
650 $aDeois Flavopicta
653 $acontrole
700 1 $aANDRADE, R. P. de
700 1 $aGOMES, D. T.
700 1 $aROCHA, C. M. C. da
773 $tPesquisa Agropecuária Brasileira, Brasília$gv.24, n.8; p. 961-968 ago. 1989.
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