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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
20/07/2023 |
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Autoria: |
WIEGERT, R. G.; EVANS, F. C. |
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Título: |
Primary production and disappearance of dead vegetation on an old field in southeastern Michigan. |
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Ano de publicação: |
1964 |
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Fonte/Imprenta: |
Ecology, v. 45, n. 1, p. 49-63, Jan. 1964. |
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Idioma: |
Inglês |
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Conteúdo: |
During the period 1949-60 the flora of a long- abandoned field in southeastern Michigan showed little change. The peak standing crop of vegeta- tion remained relatively constant from year to year, but during this period grasses decreased in importance from more than 90% of the standing crop biomass to less than 50%o. Because of the diverse perennial flora of the Old Field, the peak standing crop was not a good indi- cation of annual net production. Instead, the an- nual disappearance of dead material was equated with the net annual growth, exclusive of herbivore consumption. Dead material in place on the field disappeared at rates of from 8.4 to 1.3 mg/g per day on the upland and 13.6 to 1.8 mg/g per day on the swales, depending on time of year. Material placed in mesh bags did not disappear as fast as undisturbed material, even after being on the field 6 months. But the mesh-bag experiments showed that the rate of disappearance did differ with species of plant during the first 2 months after placement, but not thereafter. The rates of disappearance of dead material, combined with data on green and dead standing crops, were used to calculate net production of the aboveground plant parts and its seasonal distribu- tion in 1959 and 1960. In 1959, shoot production on the Old Field was: upland, 1,328 kcal/m2; swale, 4,102 kcal/m2. In 1960 the corresponding values were: upland, 1,392 kcal/m2 and swale, 4,629. The net annual production of root biomass in 1960 was minimally estimated as 631 kcal/m2 on upland and 1,573 kcal/m2 on the swales. Net production of the vegetation in 1960 (ex- clusive of herbivore consumption but including root production) thus was estimated as 2,023 kcal/m2 on upland and 6,202 kcal/m2 on the swales. Because of the greater quantitative importance of root growth as compared to the amount of herbivore consumption, lack of detailed informa- tion about the latter is less an obstacle to the cor- rect estimation of annual net production of vege- tation than is the present ignorance of the dynamic processes associated with the subterranean parts of the plant community MenosDuring the period 1949-60 the flora of a long- abandoned field in southeastern Michigan showed little change. The peak standing crop of vegeta- tion remained relatively constant from year to year, but during this period grasses decreased in importance from more than 90% of the standing crop biomass to less than 50%o. Because of the diverse perennial flora of the Old Field, the peak standing crop was not a good indi- cation of annual net production. Instead, the an- nual disappearance of dead material was equated with the net annual growth, exclusive of herbivore consumption. Dead material in place on the field disappeared at rates of from 8.4 to 1.3 mg/g per day on the upland and 13.6 to 1.8 mg/g per day on the swales, depending on time of year. Material placed in mesh bags did not disappear as fast as undisturbed material, even after being on the field 6 months. But the mesh-bag experiments showed that the rate of disappearance did differ with species of plant during the first 2 months after placement, but not thereafter. The rates of disappearance of dead material, combined with data on green and dead standing crops, were used to calculate net production of the aboveground plant parts and its seasonal distribu- tion in 1959 and 1960. In 1959, shoot production on the Old Field was: upland, 1,328 kcal/m2; swale, 4,102 kcal/m2. In 1960 the corresponding values were: upland, 1,392 kcal/m2 and swale, 4,629. The net annual production of root biomass in 1960 was minimally estimat... Mostrar Tudo |
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Palavras-Chave: |
Degraded pasture; Pastagem degradada; Restolho. |
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Thesagro: |
Decomposição; Pastagem. |
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Thesaurus Nal: |
Pastures; Soil degradation; Stubble. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02763naa a2200229 a 4500
001 1522769
005 2023-07-20
008 1964 bl uuuu u00u1 u #d
100 1 $aWIEGERT, R. G.
245 $aPrimary production and disappearance of dead vegetation on an old field in southeastern Michigan.$h[electronic resource]
260 $c1964
520 $aDuring the period 1949-60 the flora of a long- abandoned field in southeastern Michigan showed little change. The peak standing crop of vegeta- tion remained relatively constant from year to year, but during this period grasses decreased in importance from more than 90% of the standing crop biomass to less than 50%o. Because of the diverse perennial flora of the Old Field, the peak standing crop was not a good indi- cation of annual net production. Instead, the an- nual disappearance of dead material was equated with the net annual growth, exclusive of herbivore consumption. Dead material in place on the field disappeared at rates of from 8.4 to 1.3 mg/g per day on the upland and 13.6 to 1.8 mg/g per day on the swales, depending on time of year. Material placed in mesh bags did not disappear as fast as undisturbed material, even after being on the field 6 months. But the mesh-bag experiments showed that the rate of disappearance did differ with species of plant during the first 2 months after placement, but not thereafter. The rates of disappearance of dead material, combined with data on green and dead standing crops, were used to calculate net production of the aboveground plant parts and its seasonal distribu- tion in 1959 and 1960. In 1959, shoot production on the Old Field was: upland, 1,328 kcal/m2; swale, 4,102 kcal/m2. In 1960 the corresponding values were: upland, 1,392 kcal/m2 and swale, 4,629. The net annual production of root biomass in 1960 was minimally estimated as 631 kcal/m2 on upland and 1,573 kcal/m2 on the swales. Net production of the vegetation in 1960 (ex- clusive of herbivore consumption but including root production) thus was estimated as 2,023 kcal/m2 on upland and 6,202 kcal/m2 on the swales. Because of the greater quantitative importance of root growth as compared to the amount of herbivore consumption, lack of detailed informa- tion about the latter is less an obstacle to the cor- rect estimation of annual net production of vege- tation than is the present ignorance of the dynamic processes associated with the subterranean parts of the plant community
650 $aPastures
650 $aSoil degradation
650 $aStubble
650 $aDecomposição
650 $aPastagem
653 $aDegraded pasture
653 $aPastagem degradada
653 $aRestolho
700 1 $aEVANS, F. C.
773 $tEcology$gv. 45, n. 1, p. 49-63, Jan. 1964.
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| 2. |  | CATUCHI, T. A.; SORATTO, R. P.; FRANCISQUINI JÚNIOR, A.; GUIDORIZZI, F. V. C.; TIRITAN, C. S. Nitrogen management of forage grasses for nutrition, seed production, and nutrients in residual straw. Pesquisa Agropecuária Brasileira, v. 54, e00114, 2019. Título em português: Manejo do nitrogênio em gramíneas forrageiras quanto à nutrição, produção de sementes e nutrientes na palhada residual.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 3. | | CATUCHI, T. A.; GUIDORIZZI, F. V. C.; GUIDORIZI, K. A.; BARBOSA, A. de M. B.; SOUZA, G. M. Respostas fisiológicas de cultivares de soja à adubação potássica sob diferentes regimes hídricos. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 47, n. 4, p. 519-527, abr. 2012. Tíitulo em inglês: Physiological responses of soybean cultivars to potassium fertilization under different water regimes.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 4. | | CATUCHI, T. A.; SOUZA, G. M.; SORATTO, R. P.; FOLONI, J. S. S.; GUIDORIZZI, F. V. C.; BARBOSA, A. de M.; GUIDORIZI, K. A.; KUWAHARA, F. A. Biomassa de cultivares de soja sob déficit hídrico e adubação potássica. In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 30.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 14.; SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 12.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 9.; SIMPÓSIO SOBRE SELÊNIO NO BRASIL, 1., 2012, Maceió. A responsabilidade socioambiental da pesquisa agrícola: anais. Viçosa: SBCS, 2012. 4 p. Trab. 1370. 1 CD-ROM. Fertbio.| Tipo: Artigo em Anais de Congresso |
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