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Abstract:

Estimating aboveground biomass of vegetation is essential for population, community and ecosystem studies. In systems dominated or co-dominated by woody species, biomass estimation is difficult, and rapid and non-destructive methods are needed. In this study, we describe biomass distribution in different components (i.e., wood, leaves) and how this changes with shrub size for the three dominant species of shrubs in the Occidental District of the Patagonian steppe. We also describe the population size structure of the three species in grazed fields and estimate their contribution to total abundance and biomass through a non-destructive method. We developed allometric equations to estimate aboveground biomass components of individual shrubs from structural descriptors (i.e., diameter and height of the crown), sampling individual plants of different sizes. The variable that best predicted biomass of the three species was the sum of the height and the average diameter of the crown (calculated with the largest diameter and its perpendicular). Allometric models for each species explained more than 83% of the variability of individual aboveground biomass. At the individual level, species had different proportions of wood, leaves and specific wood weight. Increasing shrub size was accompanied by changes in the proportion of leaves to wood, and in some cases, the percentage of dead crown. At the population level, the three species differed in size distribution in moderately grazed fields. Development of allometric models from a population perspective is important to study demographic processes that drive community and ecosystem responses to environmental and land-use changes.

Registro:

Documento: Artículo
Título:Individual plant and population biomass of dominant shrubs in Patagonian grazed fields
Autor:Oñatibia, G.R.; Aguiar, M.R.; Cipriotti, P.A.; Troiano, F.
Filiación:Cátedra de Ecología-IFEVA, Departamento de Recursos Naturales y Ambiente, Universidad de Buenos Aires/CONICET, Av. San Martín 4453, (C1417DSE), Buenos Aires, Argentina
Departamento de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires/CONICET, Buenos Aires, Argentina
Palabras clave:Adesmia volckmannii; Allometric equations; Mulinum spinosum; Semi-arid ecosystems; Senecio filaginoides; Woody species; aboveground biomass; allometry; coexistence; demography; dominance; grazing; growth modeling; land use change; leaf; phytomass; semiarid region; shrub; size structure; steppe; wood; Patagonia; Adesmia volckmannii; Mulinum spinosum; Senecio; Senecio filaginoides
Año:2010
Volumen:20
Número:3
Página de inicio:269
Página de fin:279
Título revista:Ecologia Austral
Título revista abreviado:Ecol. Austral
ISSN:03275477
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v20_n3_p269_Onatibia

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Citas:

---------- APA ----------
Oñatibia, G.R., Aguiar, M.R., Cipriotti, P.A. & Troiano, F. (2010) . Individual plant and population biomass of dominant shrubs in Patagonian grazed fields. Ecologia Austral, 20(3), 269-279.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v20_n3_p269_Onatibia [ ]
---------- CHICAGO ----------
Oñatibia, G.R., Aguiar, M.R., Cipriotti, P.A., Troiano, F. "Individual plant and population biomass of dominant shrubs in Patagonian grazed fields" . Ecologia Austral 20, no. 3 (2010) : 269-279.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v20_n3_p269_Onatibia [ ]
---------- MLA ----------
Oñatibia, G.R., Aguiar, M.R., Cipriotti, P.A., Troiano, F. "Individual plant and population biomass of dominant shrubs in Patagonian grazed fields" . Ecologia Austral, vol. 20, no. 3, 2010, pp. 269-279.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v20_n3_p269_Onatibia [ ]
---------- VANCOUVER ----------
Oñatibia, G.R., Aguiar, M.R., Cipriotti, P.A., Troiano, F. Individual plant and population biomass of dominant shrubs in Patagonian grazed fields. Ecol. Austral. 2010;20(3):269-279.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03275477_v20_n3_p269_Onatibia [ ]