|
|
|
Registros recuperados: 24 | |
|
| |
|
|
AVANZI, J. C.; NORTON, L. D.; SILVA, M. L. N.; CURI, N.; OLIVEIRA, A. H.; SILVA, M. A. da. |
The objective of this work was to evaluate the aggregate stability of tropical soils under eucalyptus plantation and native vegetation, and assess the relationships between aggregate stability and some soil chemical and physical properties. Argisols, Cambisol, Latosols and Plinthosol within three eucalyptus-cultivated regions, in the states of Espírito Santo, Rio Grande do Sul and Minas Gerais, Brazil, were studied. For each region, soils under native vegetation were compared to those under minimum tillage with eucalyptus cultivation. The aggregate stability was measured using the high‑energy moisture characteristic (HEMC) technique, i.e., the moisture release curve at very low suctions. This method compares the resistance of aggregates to... |
Tipo: Artigo de periódico |
Palavras-chave: Curva característica de umidade em alta energia; Eucalipto; Floresta; Solo tropical; Umidade; Eucalyptus; Forest soils; Tropical soils. |
Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/903131 |
| |
|
| |
|
|
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... |
|
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 |
| |
|
|
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... |
|
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 |
| |
|
|
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 |
| |
|
| |
|
| |
|
| |
|
|
CUNHA, L.; BARTZ, M.; DEMETRIO, W.; SILVA, T.; JAMES, S.; SILVA, E. da; STANTON, D.; CONRADO, A. C.; DECAENS, T.; LAVELLE, P.; SANTOS, A.; NADOLNY, H.; VELÁSQUEZ, E.; ZANGERLÉ, A.; TAPIA-CORAL, S.; FERREIRA, T.; MAIA, L.; SEGALLA, R.; CLEMENT, C.; MUNIZ, A. W.; KILLE, P.; BROWN, G. G.. |
Tipo: Separatas |
Palavras-chave: Terras Escuras Amazônicas; Solo florestal; Minhoca; Forest soils. |
Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1067230 |
| |
|
| |
|
| |
|
|
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,... |
|
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 |
| |
|
|
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 |
| |
|
|
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 |
| |
|
|
RIBEIRO, F. C.; OLIVEIRA, A. D. de; FERREIRA, E. A. B.; BISPO, O. B.; ZANSAVIO, A. M. de O.; GATTO, A.. |
O nitrogênio ocupa lugar de destaque entre os elementos essenciais ao desenvolvimento das plantas e pode ser absorvido na forma nitrato (NO3-) e amônio (NH4+). Este trabalho avaliou em diferentes camadas do solo a variação dos teores de (NO3-) e (NH4+) no período seco, em Latossolo Vermelho distrófico no Distrito Federal, sob quatro tratamentos: cerrado sentido restrito (cerrado típico e denso), florestas plantadas de eucalipto de diferentes idades. Cada tratamento foi composto de três parcelas. Próximo de cada parcela foram lançados oito vezes um gabarito metálico de 50x50 cm para análise da camada de serapilheira em contato com o solo e para as demais camadas foram coletadas oito amostras de solo nos intervalos de profundidades de 0-5 e 5-10 cm, no mês... |
Tipo: Separatas |
Palavras-chave: Amônio; Solo florestal; Eucalipto; Nitrogênio; Nitrato; Cerrado; Forest soils; Eucalyptus; Nitrogen; Nitrates; Ammonium fertilizers; Savannas; Brazil. |
Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1039266 |
| |
|
|
NASCIMENTO, A. F. do; RODRIGUES, R. de A. R.; SILVEIRA, J. G. da; SILVA, J. J. N. da; DANIEL, V. de C.; SEGATTO, E. R.. |
Although agriculture and livestock systems represent important sources of N2O from the soil, they may also aid in emissions mitigation, mainly when integrated systems are taken into account, such as crop-livestock-forest, for food production. This work assessed the soil N2O emissions from a tropical Oxisol under row-crop, livestock, forest monocultures, and an integrated crop-livestock-forest system in the Southern Amazon - Brazil. Soil N2O emissions were measured using static chambers from November 2014 to October 2016 in four soil use systems [row-crop, livestock, forest, and integrated crop-livestock-forest (CLF)], and in a reference area under native forest fragment. For the whole period, the average of soil N2O fluxes was 16.9, 12.2, and 15.4 ug N2O-N... |
Tipo: Artigo de periódico |
Palavras-chave: Mitigação; Mato Grosso; Sinop-MT; Aquecimento; Oxisol; Gás; Efeito Estufa; Latossolo; Solo Florestal; Global warming; Greenhouse effect; Greenhouse gases; Oxisols; Forest soils. |
Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1123759 |
| |
|
| |
|
| |
|
| |
Registros recuperados: 24 | |
|
|
|