|
|
|
|
|
Sixel,Ricardo Michael de Melo; Arthur Junior,José Carlos; Gonçalves,José Leonardo de Moraes; Alvares,Clayton Alcarde; Andrade,Gabriel Ramatis Pugliese; Azevedo,Antonio Carlos; Stahl,James; Moreira,Antônio Maurício. |
ABSTRACT The impact of intensive management practices on the sustainability of forest production depends on maintenance of soil fertility. The contribution of forest residues and nutrient cycling in this process is critical. A 16-year-old stand of Pinus taeda in a Cambissolo Húmico Alumínico léptico (Humic Endo-lithic Dystrudept) in the south of Brazil was studied. A total of 10 trees were sampled distributed in five diameter classes according to diameter at breast height. The biomass of the needles, twigs, bark, wood, and roots was measured for each tree. In addition to plant biomass, accumulated plant litter was sampled, and soil samples were taken at three increments based on sampling depth: 0.00-0.20, 0.20-0.40, 0.40-0.60, 0.60-1.00, 1.00-1.40,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Nutrient cycling; Forest management. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501416 |
| |
|
|
Gatiboni,Luciano Colpo; Vargas,Cristiane Ottes; Albuquerque,Jackson Adriano; Almeida,Jaime Antonio; Stahl,James; Chaves,Djalma Miller; Brunetto,Gustavo; Dall’Orsoletta,Daniel João; Rauber,Luiz Paulo. |
ABSTRACT: Pinus cultivation without fertilization is a common practice in southern Brazil, which can induce a decline in the availability of phosphorus (P) in the soil. The purpose of this study was to evaluate the changes in phosphorus fractions in a Humic Cambisol subjected to continuous Pinus taeda L. cultivation without fertilization. Two forest stands were evaluated, after 16 years of Pinus cultivation (1st crop) and 49 years (3rd crop), when soil samples were collected (layers 0-10, 10-20, 20-40, 40-60, and 60-80cm) from six trenches per forest. In soil samples, the P contained in organic (Po) and inorganic (Pi) forms was determined by sequential chemical fractionation. Labile inorganic P fractions remained unchanged after the different cultivation... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest rotations; Successive crops; Phosphorus fractionation; Labile phosphorus. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700302 |
| |
|
|
|