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| Registros recuperados: 13 | |
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| Pérez Sandoval, Reyna. |
| Este trabajo se realizó en plantaciones establecidas por la empresa Forestaciones Operativas Mexicanas (FOMEX), en el Municipio de Huimanguillo, Tabasco, con la finalidad de encontrar relaciones entre variables del suelo superficial (0-20 y 20-40cm) y el crecimiento de plantaciones de Eucalyptus urophylla y E. grandis. Como índice de crecimiento se utilizó índice de sitio (IS) y las variables edáficas estudiadas fueron: pH, materia orgánica, fósforo extractable, los cationes intercambiables: K, Ca y Mg. También se consideró la capacidad de intercambio catiónico, porcentaje de saturación de bases, porcentaje de saturación de aluminio, densidad aparente, nitrógeno total, capacidad de retención de humedad a capacidad de campo y textura. Se colectaron... |
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Palavras-chave: Plantaciones forestales; Suelo; Productividad; Eucalyptus; Indice de sitio; Forest plantations; Forest soils; Soil productivity; Eucalyptus; Site index; Maestría; Forestal. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/190 |
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| Pérez Sandoval, Reyna. |
| Este trabajo se realizó en plantaciones establecidas por la empresa Forestaciones Operativas Mexicanas (FOMEX), en el Municipio de Huimanguillo, Tabasco, con la finalidad de encontrar relaciones entre variables del suelo superficial (0-20 y 20-40cm) y el crecimiento de plantaciones de Eucalyptus urophylla y E. grandis. Como índice de crecimiento se utilizó índice de sitio (IS) y las variables edáficas estudiadas fueron: pH, materia orgánica, fósforo extractable, los cationes intercambiables: K, Ca y Mg. También se consideró la capacidad de intercambio catiónico, porcentaje de saturación de bases, porcentaje de saturación de aluminio, densidad aparente, nitrógeno total, capacidad de retención de humedad a capacidad de campo y textura. Se colectaron... |
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Palavras-chave: Plantaciones forestales; Suelo; Productividad; Eucalyptus; Indice de sitio; Forest plantations; Forest soils; Soil productivity; Eucalyptus; Site index; Maestría; Forestal. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/190 |
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| Pérez González, Guadalupe. |
| En el manejo de los recursos forestales es de importancia cuantificar el rendimiento potencial de la especie, la calidad de los suelos y la relación que guardan entre si estos dos últimas variables. La determinación de la calidad de sitio en las plantaciones forestales es usada para la confección de modelos y tablas de producción. Para la caracterización dasométrica, se usaron mediciones realizadas entre el año 2003 y 2007 de ocho plantaciones de Swietenia macrophylla King establecidas en Tabasco pertenecientes a una red de parcelas permanentes. Se midieron 21 parcelas, conformada cada una por 44 árboles en promedio. Las ocho plantaciones presentaron edades de 7 a 16 años, densidades de 156 a 4166 árb.ha-!, supervivencia de 60 a 100%, altura... |
| Tipo: Tesis |
Palavras-chave: Caracterización dasométrica; Modelo de Korf; Índice de sitio; Suelos forestales Dasometric characterization; Korf model; Site index; Forest soils. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/1094 |
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| Álvarez-Arteaga*,Gustavo; García-Fajardo,Belina; Orozco-Hernández,María Estela; Mireles-Lezama,Patricia; Contreras-Martínez,Julieta. |
| Abstract The loss of organic carbon stocks from the soil and their expulsion into the atmosphere due to the effect of anthropogenic activities must be understood as a problem that goes beyond the environmental to the social and economic context, with the soil degradation being just one of its many impacts. While the accumulation of carbon in the soil depends naturally on the interaction among a series of biotic and abiotic factors, management practices often cause the deterioration of its physical, chemical and biological properties, and, thus, increase the levels of mineralization and a reduction in carbon stocks. This research was undertaken in the municipality of San José del Rincón, State of Mexico, in volcanic soils under different conditions of soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stocks; Bulk density; Organic material; Management practices; Forest soils. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100021 |
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| Tani, Masayuki; Koike, Masanori; Kuramochi, Katsuhisa; Higashi, Teruo; 谷, 昌幸; 小池, 正徳; 倉持, 勝久; 東, 照雄. |
| The effects of the addition of decomposing forest litter, collected from Podzolic soil organic layers (Oi, Oe and Oa) and Brown Forest soil Oe layers, on the amounts and composition of low molecular weight aliphatic carboxylic acids (LACAs) in soils were investigated by incubation experiments for 4 weeks. The total amounts of LACAs were greater at the beginning of incubation (384 to 1155 μmol kg-1), but decreased abruptly after 1 week, becoming relatively stable for a period of 1 to 4 weeks (299 to 377 μmol kg-1). The average amounts (without 0 weeks) of LACAs, especially acetic acid and citric acid, in soils incubated with forest litter under moderately moist conditions, were smaller than in the blank soil. Larger amounts of LACAs, especially formic acid,... |
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Palavras-chave: Decomposing forest litter; Forest soils; Incubation experiment; Low-molecular-weight aliphatic carboxylicacid (LACA); Soil microflora. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/98 |
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| Pinto,Leandro Campos; Zinn,Yuri Lopes; Mello,Carlos Rogério de; Owens,Phillip Ray; Norton,Lloyd Darrell; Curi,Nilton. |
| ABSTRACTUnderstanding soil formation processes across different landscapes is needed to predict how soil properties will respond to land use change. This study aimed to characterize mountainous Inceptisols (Cambisols) under high altitude subtropical climate in southeastern Brazil, by soil physical, chemical and micromorphological analyses, under native forest and pasture. The soil under pasture had a greater bulk density than under forest, resulting in a severe reduction of macroporosity. At two depths, coarse quartz grains are angular, suggesting absence of transportational processes, thus confirming an autochthonous pedogenesis from the underlying gneissic rock. Most feldspars were weathered beyond recognition, but mineral alteration was commonly seen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil formation; Soil microstructure; Land use change; Forest soils. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000500455 |
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| Trasar-Cepeda,Carmen; Leirós,Maria Carmen; Gil-Sotres,Fernando. |
| Human activity is one of the main causes of the physical, chemical and biological degradation of soils. This degradation implies a change in soil quality as it involves both a decrease in productivity and changes in the ecological functions of the soil. The objective of the present study was to investigate the effect of soil use on soil biochemical properties, with the aim of providing data that allow assessment of the usefulness of enzymatic activities as indicators of soil quality. In addition to physical and chemical properties, different hydrolase enzymes involved in the C, N, P and S cycles, and other biochemical properties, such as the microbial biomass C and soil basal respiration, were analysed. The results obtained allowed different conclusions to... |
| Tipo: Journal article |
Palavras-chave: Soil enzymes; Soil biochemical properties; Soil use; Soil management; Forest soils; Agricultural soils. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200007 |
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| Delgado-Caballero,Carina E.; Gómez-Guerrero,Armando; Valdez-Lazalde,José R.; De los Santos-Posadas,Hector; Fierros-González,Aurelio M.; Horwath,William R.. |
| Research on the ability of tropical soils to support fast-growing forests species is required to optimize, preserve and select lands for timber production. In this work site index (SI) of Eucalyptus grandis and E. urophylla plantations in Southeastern Mexico, was related to chemical and physical soil properties. Based on a joint model of SI vs. sand content, the fit suggests that SI improves as the sand content increases (p<0.01). Sand content of 28% in the surface soil (0-5 cm) and 24% in the sub-surface soil (5-30 cm) is a desired minimum for establishing highly productive stands. The best SI conditions were found on sandy soils with a sand content of 65 %. Other variables, such as soil bulk density, N mineralization and organic matter were also... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest plantations; Forest soils; Site productivity; Soil physical properties. |
| Ano: 2009 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952009000100007 |
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| Gianotti,André Rodrigues da Cunha; Souza,Maria José Hatem de; Pereira,Israel Marinho; Machado,Evandro Luiz Mendonça; Vieira,Artur Duarte; Magalhães,Mariana Rodrigues. |
| Lychnophora pohlii Sch. Bip. (Asteraceae), known as "Arnica mineira", is widely used in folk medicine and very abundant in the altitude vegetation of rocky grassland. The aim of this work was to study the density of this species and its relationship with soil parameters in rocky grassland in Diamantina, in the Upper Jequitinhonha region, Minas Gerais. Ten contiguous 20 x 50 m plots were marked (total sampled area 10,000 m²) on the campus Juscelino Kubitschek of the Federal University of Jequitinhonha and Mucuri Valleys (UFVJM). The plants in these plots were evaluated for frequency, dominance and density. The relationship between the density of this species with nine soil physical and chemical properties was analyzed by means of canonical correspondence... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rocky grassland; Savanna; Forest soils; Canonical correspondence analysis. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300002 |
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| Registros recuperados: 13 | |
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