Consulta: subjectFacets:"Soil CO2 emission"
Registros recuperados: 4
Data/hora: 15/06/2024 18:13:53

Temporal variability of soil CO2 emission after conventional and reduced tillage described by an exponential decay in time model
Provedor de dados: 70
Autores: Teixeira,Luis G; Lopes,Afonso; La Scala Jr,Newton.
To study Assessing the impact of tillage practices on soil carbon losses dependents it is necessary to describe the temporal variability of soil CO2 emission after tillage. It has been argued that large amounts of CO2 emitted after tillage may serve as an indicator for longer-term changes in soil carbon stocks. Here we present a two-step function model based on soil temperature and soil moisture including an exponential decay in time component that is efficient in fitting intermediate-term emission after disk plow followed by a leveling harrow (conventional), and chisel plow coupled with a roller for clod breaking (reduced) tillage. Emission after reduced tillage was described using a non-linear estimator with determination coefficient (R²) as high as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Soil CO2 emission; Soil tillage; Greenhouse effect.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162010000200004

Temporal and spatial variation of soil respiration under mulching in a greenhouse cucumber cultivation
Provedor de dados: 86
Autores: Mu,Lan; Fang,Lan; Liang,YinLi.
Abstract: The objective of this work was to determine the temporal and spatial variations of soil respiration (Rs) in a greenhouse, as well as the factors causing them, in a soil covered with different mulching types and cultivated with cucumber (Cucumis sativus). Four mulching treatments were applied to a soil cultivated with cucumber: CK, conventional practice without mulch; FM, plastic film mulch; CM, combined mulch of plastic film with wheat straw; and SM, wheat straw mulch. Rs was measured by a soil respiration chamber connected to a portable infrared gas analyzer, and the differences of Rs between mulchings were evaluated. Rs was significantly lower in the control than in the treatments with mulch. In addition, Rs was higher in the position on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus; Climate change; Soil CO2 emission; Soil quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000700869

Influence of liming on residual soil respiration and chemical properties in a tropical no-tillage system
Provedor de dados: 90
Autores: Marcelo,Adolfo Valente; Corá,José Eduardo; Scala Junior,Newton La.
Because of the climate changes occurring across the planet, especially global warming, the different forms of agricultural soil use have attracted researchers´ attention. Changes in soil management may influence soil respiration and, consequently, C sequestration. The objectives of this study were to evaluate the long-term influence of liming on soil respiration and correlate it with soil chemical properties after two years of liming in a no-tillage system. A randomized complete block design was used with six replications. The experimental treatments consisted of four lime rates and a control treatment without lime. Two years after liming, soil CO2 emission was measured and the soil sampled (layers 0-5, 5-10, 10-20, and 20-30 cm). The P, Ca2+ e Mg2+ soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil CO2 emission; Limestone; Soil fertility.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100005

Classification of soil respiration in areas of sugarcane renewal using decision tree
Provedor de dados: 63
Autores: Farhate,Camila Viana Vieira; Souza,Zigomar Menezes de; Oliveira,Stanley Robson de Medeiros; Carvalho,João Luís Nunes; Scala Júnior,Newton La; Santos,Ana Paula Guimarães.
ABSTRACT: The use of data mining is a promising alternative to predict soil respiration from correlated variables. Our objective was to build a model using variable selection and decision tree induction to predict different levels of soil respiration, taking into account physical, chemical and microbiological variables of soil as well as precipitation in renewal of sugarcane areas. The original dataset was composed of 19 variables (18 independent variables and one dependent (or response) variable). The variable-target refers to soil respiration as the target classification. Due to a large number of variables, a procedure for variable selection was conducted to remove those with low correlation with the variable-target. For that purpose, four approaches of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil CO2 emission; Data mining; Variable selection; Soil temperature; Soil organic matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300216