Debido a que en 2020 iban a cumplirse los 130 años del primer número de la Revista del Museo de L... more Debido a que en 2020 iban a cumplirse los 130 años del primer número de la Revista del Museo de La Plata (RMLP), desde el equipo editorial decidimos convocar a quienes en ese entonces se desempeñaban como Jefes de División del Museo de La Plata, para invitarlos a escribir un artículo que conmemorase dicha fecha. En la reuniones que realizamos, se decidió que quienes iban a participar lo harían escribiendo un artículo (como único autor o en colaboración) que iba a seguir uno de los siguientes modelos: a) analizar la totalidad de los artículos publicados en la RMLP en cada una de sus disciplinas y destacar aquellos que, a juicio de los autores, tuviese una significancia particular, o b) reseñar o comparar algunos de los artículos disciplinares que, también a su juicio, hubiesen dejado una huella en el contexto de la disciplina. Por otra parte, los por entonces integrantes del equipo editorial colaboraríamos con un artículo en el cual se describiese la totalidad de los documentos publi...
Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hy... more Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hypothesized that fine root biomass and litter mass increased with age increasing in plantations. Five, seven and seventeen year old stands of Eucalyptus grandis were sampled. All of them were first rotation stands. We estimated the mass of litter and fine roots (< 5 mm) in the top 30 cm of the soil profile. We determined: carbon, nitrogen, phosphorus, potassium, calcium and magnesium concentrations in living fine roots and litter. Their mineral content was calculated. ANOVA was used for comparisons among stands. Biomass and mineral content of fine roots in the 30 cm of the soil profile were similar in seven and seventeen year old stands and higher than in the five year old stand. When only 10 cm of the soil profile were considered, the seventeen year old stand exhibited the highest biomass and root mineral content. Before seven years fine root biomass and mineral content were stabilized. Mass and mineral content of the litter increased with age. Redistribution of roots in the soil profile with stands age might be related to the increased litter stock and its influence on water and nutrient dynamics.
El objetivo de este trabajo es analizar la evolución de la Paleontología de Vertebrados en Argent... more El objetivo de este trabajo es analizar la evolución de la Paleontología de Vertebrados en Argentina, tomando como fuente la revista Ameghiniana. Utilizando todos los documentos sobre Paleontología de Vertebrados publicados en dicha revista en el período 1957-2014, se cuantificaron aspectos como el número de trabajos publicados, el número de firmas (totales y por trabajo), los porcentajes de autores hombres y mujeres, la procedencia del primer autor, la procedencia geográfica de los fósiles, la representación de los grandes intervalos temporales (eras y períodos) y los temas considerados. Se analizaron un total de 668 documentos. Los resultados muestran a lo largo del periodo un incremento en el número de trabajos y en el número de autores por trabajo (esto último, fundamentalmente a partir de los ’80). Asimismo, se observa un incremento en la cantidad de autorías masculinas y femeninas, en una disciplina aun masculinizada pero que muestra una promisoria tendencia hacia la paridad/e...
Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hy... more Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hypothesized that fine root biomass and litter mass increased with age increasing in plantations. Five, seven and seventeen year old stands of Eucalyptus grandis were sampled. All of them were first rotation stands. We estimated the mass of litter and fine roots (< 5 mm) in the top 30 cm of the soil profile. We determined: carbon, nitrogen, phosphorus, potassium, calcium and magnesium concentrations in living fine roots and litter. Their mineral content was calculated. ANOVA was used for comparisons among stands. Biomass and mineral content of fine roots in the 30 cm of the soil profile were similar in seven and seventeen year old stands and higher than in the five year old stand. When only 10 cm of the soil profile were considered, the seventeen year old stand exhibited the highest biomass and root mineral content. Before seven years fine root biomass and mineral content were stabilized. Mass and mineral content of the litter increased with age. Redistribution of roots in the soil profile with stands age might be related to the increased litter stock and its influence on water and nutrient dynamics.
Eucalyptus plantations in the Mesopotamia Argentina are cultivated under intensive forestry and s... more Eucalyptus plantations in the Mesopotamia Argentina are cultivated under intensive forestry and show large increases in biomass and nutrients demand. Although belowground biomass is <10% of the total biomass of E. grandis, fine roots have high turnover rates and represent an important sink and source of nutrients. There is little information about belowground dynamics of E. grandis in the Mesopotamia Argentina. The objective is to estimate nutrients requirement and return from fine roots of E. grandis plantations at two different ages. Plantations 5 (E5) and 17 (E17) years old were sampled seasonally over a year. Soil was deep red sandy soil (Order Entisols). The mass of fine roots (<5 mm) was estimated by removing 15 cylinders of 6.9 x 10 cm, up to 30 cm depth. Roots were separated in live (RFV) and dead (RFM) compartments. The concentration of P, K, Ca and Mg were determined with a Beckman Spectra-scan, and C and N with a LECO-CNS-analyzer. Nutrients content was estimated as root dry mass/unit area per nutrient concentration (nutrient mass/dry mass). Mass of RFV and RFM were compared by repeated measures analysis with the seasons as intra-subject factor. We calculated productivity and mortality of fine roots by mass difference. We estimated nutrient fluxes as Cole & Rapp (1981) and turnover rates (productivity / RFV biomass; requirement / RFV mineralmass). Biomass and mineralmass of fine roots increased between E5 and E17. Productivity, requirements and root turnover rates decreased with increasing age. The requirements of N and P were in E5: N = 8 kg.ha-1 .year-1 and P = 0.4 kg.ha-1 .year-1 , and in E17: N = 6 kg.ha-1 .year-1 and P = 0.3 kg.ha-1 .year-1. The returns were lower than the requirements in E5, and in E17 resemble each other. This suggests that biomass and its mineral content in the young plantation was increasing and there was a tendency to stability in the oldest plantation. The highest rates of growth and nutrients demand in the roots were observed in the first 5 years of planting. The N:P requirements ratio indicates higher N requirement per unit of P in the younger plantation. RESUMEN En la Mesopotamia argentina las plantaciones de Eucalyptus bajo silvicultura intensiva muestran elevados incrementos de biomasa y demanda de nutrientes. Aunque la biomasa subterránea representa <10% de la biomasa total de E. grandis, las raíces finas presentan
Debido a que en 2020 iban a cumplirse los 130 años del primer número de la Revista del Museo de L... more Debido a que en 2020 iban a cumplirse los 130 años del primer número de la Revista del Museo de La Plata (RMLP), desde el equipo editorial decidimos convocar a quienes en ese entonces se desempeñaban como Jefes de División del Museo de La Plata, para invitarlos a escribir un artículo que conmemorase dicha fecha. En la reuniones que realizamos, se decidió que quienes iban a participar lo harían escribiendo un artículo (como único autor o en colaboración) que iba a seguir uno de los siguientes modelos: a) analizar la totalidad de los artículos publicados en la RMLP en cada una de sus disciplinas y destacar aquellos que, a juicio de los autores, tuviese una significancia particular, o b) reseñar o comparar algunos de los artículos disciplinares que, también a su juicio, hubiesen dejado una huella en el contexto de la disciplina. Por otra parte, los por entonces integrantes del equipo editorial colaboraríamos con un artículo en el cual se describiese la totalidad de los documentos publi...
Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hy... more Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hypothesized that fine root biomass and litter mass increased with age increasing in plantations. Five, seven and seventeen year old stands of Eucalyptus grandis were sampled. All of them were first rotation stands. We estimated the mass of litter and fine roots (< 5 mm) in the top 30 cm of the soil profile. We determined: carbon, nitrogen, phosphorus, potassium, calcium and magnesium concentrations in living fine roots and litter. Their mineral content was calculated. ANOVA was used for comparisons among stands. Biomass and mineral content of fine roots in the 30 cm of the soil profile were similar in seven and seventeen year old stands and higher than in the five year old stand. When only 10 cm of the soil profile were considered, the seventeen year old stand exhibited the highest biomass and root mineral content. Before seven years fine root biomass and mineral content were stabilized. Mass and mineral content of the litter increased with age. Redistribution of roots in the soil profile with stands age might be related to the increased litter stock and its influence on water and nutrient dynamics.
El objetivo de este trabajo es analizar la evolución de la Paleontología de Vertebrados en Argent... more El objetivo de este trabajo es analizar la evolución de la Paleontología de Vertebrados en Argentina, tomando como fuente la revista Ameghiniana. Utilizando todos los documentos sobre Paleontología de Vertebrados publicados en dicha revista en el período 1957-2014, se cuantificaron aspectos como el número de trabajos publicados, el número de firmas (totales y por trabajo), los porcentajes de autores hombres y mujeres, la procedencia del primer autor, la procedencia geográfica de los fósiles, la representación de los grandes intervalos temporales (eras y períodos) y los temas considerados. Se analizaron un total de 668 documentos. Los resultados muestran a lo largo del periodo un incremento en el número de trabajos y en el número de autores por trabajo (esto último, fundamentalmente a partir de los ’80). Asimismo, se observa un incremento en la cantidad de autorías masculinas y femeninas, en una disciplina aun masculinizada pero que muestra una promisoria tendencia hacia la paridad/e...
Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hy... more Entre Ríos province is an important center of Eucalyptus spp. plantations in Argentina. It was hypothesized that fine root biomass and litter mass increased with age increasing in plantations. Five, seven and seventeen year old stands of Eucalyptus grandis were sampled. All of them were first rotation stands. We estimated the mass of litter and fine roots (< 5 mm) in the top 30 cm of the soil profile. We determined: carbon, nitrogen, phosphorus, potassium, calcium and magnesium concentrations in living fine roots and litter. Their mineral content was calculated. ANOVA was used for comparisons among stands. Biomass and mineral content of fine roots in the 30 cm of the soil profile were similar in seven and seventeen year old stands and higher than in the five year old stand. When only 10 cm of the soil profile were considered, the seventeen year old stand exhibited the highest biomass and root mineral content. Before seven years fine root biomass and mineral content were stabilized. Mass and mineral content of the litter increased with age. Redistribution of roots in the soil profile with stands age might be related to the increased litter stock and its influence on water and nutrient dynamics.
Eucalyptus plantations in the Mesopotamia Argentina are cultivated under intensive forestry and s... more Eucalyptus plantations in the Mesopotamia Argentina are cultivated under intensive forestry and show large increases in biomass and nutrients demand. Although belowground biomass is <10% of the total biomass of E. grandis, fine roots have high turnover rates and represent an important sink and source of nutrients. There is little information about belowground dynamics of E. grandis in the Mesopotamia Argentina. The objective is to estimate nutrients requirement and return from fine roots of E. grandis plantations at two different ages. Plantations 5 (E5) and 17 (E17) years old were sampled seasonally over a year. Soil was deep red sandy soil (Order Entisols). The mass of fine roots (<5 mm) was estimated by removing 15 cylinders of 6.9 x 10 cm, up to 30 cm depth. Roots were separated in live (RFV) and dead (RFM) compartments. The concentration of P, K, Ca and Mg were determined with a Beckman Spectra-scan, and C and N with a LECO-CNS-analyzer. Nutrients content was estimated as root dry mass/unit area per nutrient concentration (nutrient mass/dry mass). Mass of RFV and RFM were compared by repeated measures analysis with the seasons as intra-subject factor. We calculated productivity and mortality of fine roots by mass difference. We estimated nutrient fluxes as Cole & Rapp (1981) and turnover rates (productivity / RFV biomass; requirement / RFV mineralmass). Biomass and mineralmass of fine roots increased between E5 and E17. Productivity, requirements and root turnover rates decreased with increasing age. The requirements of N and P were in E5: N = 8 kg.ha-1 .year-1 and P = 0.4 kg.ha-1 .year-1 , and in E17: N = 6 kg.ha-1 .year-1 and P = 0.3 kg.ha-1 .year-1. The returns were lower than the requirements in E5, and in E17 resemble each other. This suggests that biomass and its mineral content in the young plantation was increasing and there was a tendency to stability in the oldest plantation. The highest rates of growth and nutrients demand in the roots were observed in the first 5 years of planting. The N:P requirements ratio indicates higher N requirement per unit of P in the younger plantation. RESUMEN En la Mesopotamia argentina las plantaciones de Eucalyptus bajo silvicultura intensiva muestran elevados incrementos de biomasa y demanda de nutrientes. Aunque la biomasa subterránea representa <10% de la biomasa total de E. grandis, las raíces finas presentan
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