Spatial and Temporal Variability of Soil CO2 Flux in Sugarcane Green Harvest Systems

Tavares, Rose Luiza Moraes; Souza, Zigomar Menezes de; Scala, Newton La; Castioni, Guilherme Adalberto Ferreira; Souza, Gustavo Soares de; Torres, José Luiz Rodrigues

doi:10.1590/18069657rbcs20150252

Cited by 13 publications

(19 citation statements)

References 29 publications

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“…Our results contrast with the findings of Uhlirova et al (2005), who obtained increased respiratory activity with WRC ranging from 13% to 100%, and Abro et al (2011) in soil, with WRC varying from 55% to 100%. However, similar results as obtained in this study were reported by Tavares et al (2016), where the CO 2 flux decreased in a low or high moisture concentration, as a result of the variation of the microbial activity (Oyonarte et al, 2012).…”

Section: Discussionsupporting

confidence: 92%

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Pupin

Rangel

Nahas

2018

Zemdirbyste-Agriculture

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The carbon dioxide (CO 2) efflux from various terrestrial ecosystems under various moisture contents provides a good understanding of the carbon cycle. The aim of this study was to evaluate the impact of extreme moisture content in the presence and absence of nitrogen (N) fertilizer application on CO 2 efflux (ECO 2) from forest and annual crop soils. The clay (forest (F) soil) and sandy loam (annual crop (AC) soil) with or without Rhodic Ferrasol (FR-ro) N fertilizer application were incubated under increasing concentrations of water corresponding to 40-700% of the water retention capacity (WRC). Even with the same classification, the two soils presented particular chemical and physical characteristics, probably due to the conversion of the forest area to agriculture in the AC soil. In all assays, the most ECO 2 was found at 24 h soil incubation period. After 24 h of incubation, ECO 2 diminished, and the decreased ECO 2 was found in annual crop AC 700 1 (incubated for 1728 h in 60, 80, 100, 150, 200, 300, 500 and 700 % WRC) soil. The effect of WRC varied between soils during all incubation periods. The highest ECO 2 was found in annual crop AC 200 (incubated for 144 h in 50, 75, 100, 150 and 200 % WRC) and AC 700 (incubated for 144 h in 60, 100, 150, 200, 300 and 700 % WRC) soils with 100% and 60% WRC, respectively. No effect on microbial respiratory activity by the N addition in the soil was found. In waterlogged soils or soils subject to the increased amount of water contents, incubation time and moisture concentration are two important factors that influence ECO 2 .

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Section: Discussionsupporting

confidence: 92%

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Pupin

Rangel

Nahas

2018

Zemdirbyste-Agriculture

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“…Moreover, the authors reported that changes in water volumetric content in the soil caused by rainfall influenced the relationship between soil respiration and soil temperature. Therefore, the evaluation of soil temperature must be carefully analyzed, since temperature is influenced by soil moisture, which in turn is influenced by rainfall (Tavares et al, 2016a). In agreement, Sierra et al (2015) point out that in soils, temperature and moisture covary at different spatial and temporal scales describing a trajectory in the x y plane.…”

Section: Discussionmentioning

confidence: 94%

“…In addition, there is the additional effect of the removal/displacement of air (CO 2 ) from soil porosity caused by water infiltration into the soil (Figueiredo et al, 2014). Tavares et al (2016a) observed higher soil respiration in rainy periods in comparison to the dry period, related to greater microbial activity promoted by soil moisture and root activity during plant growth and development.…”

Section: Discussionmentioning

confidence: 99%

“…In Brazil, Tavares et al (2016a) analyzed the spatial variability in green harvest system with a history of 10 years of implementation and observed that this system showed soil respiration linearly correlated to temperature (R 2 = 0.80). However, Bradford (2013) pointed that, seasonal patterns in responses from soil respiration to temperature are strongly dependent on substrate availability, for instance, the temperature must have minimal effects on respiration rates at times of the year when the substrate is depleted, and strong effects when substrate supply is abundant.…”

Section: Discussionmentioning

confidence: 99%

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Classification of soil respiration in areas of sugarcane renewal using decision tree

Farhate

Souza

Oliveira

et al. 2018

Sci. agric. (Piracicaba, Braz.)

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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 variable selection were evaluated: no variable selection, correlation-based feature selection (CFS), chisquare method (χ 2 ) and Wrapper. To classify soil respiration, we used the decision tree induction technique available in the Weka software package. Our results showed that data mining techniques allow the development of a model for soil respiration classification with accuracy of 81 %, resulting in a knowledge base composed of 27 rules for prediction of soil respiration. In particular, the wrapper method for variable selection identified a subset of only five variables out of 18 available in the original dataset, and they had the following order of influence in determining soil respiration: soil temperature > precipitation > macroporosity > soil moisture > potential acidity.

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“…A produção do gás é resultado da ação dos microrganismos e da respiração das raízes das plantas 1 2 3 4 5 E-mails: roseluizamt@gmail.com ; mcesarsolos@gmail.com ; zigomarms@feagri.unicamp.br ; lascala@fcav.unesp.br (processos biológicos). Já o transporte de CO 2 depende da estrutura física do solo, principalmente da porosidade que condiciona o fluxo de gases no solo (TAVARES et al, 2016).…”

Section: Introductionunclassified

Análise Geoestatística Da Emissão De Co2 E Macroporosidade De Um Latossolo Vermelho Eutroférrico Sob Cana-De-Açúcar

Tavares¹,

Campos²,

Souza³

et al. 2017

EnergAgric

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RESUMO:O estudo da emissão de CO 2 do solo em sistemas de manejo de cana-de-açúcar é um importante indicativo da qualidade do solo e um enfoque que pode elucidar a alguns questionamentos sobre a eficiência da conversão do sistema de cana queimada em cana crua. Baseado nisso, este trabalho teve como objetivo avaliar a variabilidade espacial da emissão de CO 2 e macroporosidade do solo em sistemas de cana-de-açúcar com e sem queima. Nas áreas em estudo foi instalada uma malha amostral (100 x 100 m) com pontos espaçados em 1, 2 e 10 m. A avaliação de CO 2 foi realizada nos pontos da malha amostral de forma simultânea, nas duas áreas, por 9 dias das 7:00 as 11:00 h, com auxílio de câmaras de solo (modelo LI-8100). Amostras indeformadas foram coletadas na camada superficial do solo (0,00-0,10 m) com auxílio de anéis volumétricos de kopeck para análises de densidade, macro e microporosidade do solo. A emissão de CO 2 e macroporosidade do solo apresentaram tendências similares na análise descritiva e geoestatística, ou seja, pode-se concluir que a macroporosidade do solo influenciou a emissão de CO 2 em sistemas de manejo de cana-de-açúcar. PALAVRAS-CHAVE:variabilidade espacial, macroporosidade, respiração do solo, cana crua, Saccharum spp. GEOSTATISTICAL ANALYSIS OF CO 2 EMISSION AND MACROPOROSITY OF RED LATOSOL EUTROFERRIC UNDER SUGARCANE CULTIVATIONABSTRACT: Soil CO 2 emission is an important soil quality indicator and an approach that can answer questions about the efficiency conversion from"burnt cane" to "green cane" systems. This work aimed to evaluate the spatial variability of CO 2 emission and soil macroporosity attributes from sugarcane cultivation systems with and without burning. A sample grid (100 x 100 m) with points spaced at 1, 2 and 10 m was installed in experimental areas. CO 2 evaluation was carried out at the all points grid in the both areas simultaneously, for 9 days, from 7:00 to 11:00 h, with soil chambers (model LI-8100). Undeformed soil samples were collected from superficial soil depth (0.00-0.10 m) using volumetric rings for soil bulk density, macro and microporosity analyzes. CO 2 emission and macroporosity showed similar trends in descriptive and geostatistical analysis. Therfore, it can be concluded that soil macroporosity influenced CO 2 emission in sugarcane management systems. KEYWORDS:Geostatistic. Macroporosity. Soil respiration. Saccharum spp. . INTRODUÇÃOA queima do canavial antes da colheita é uma prática usual no Brasil, pois facilita o corte manual, porém, esse processo tem sido questionado em relação aos seus efeitos na qualidade do solo, como a perda de carbono. No caso do estado de São Paulo, a adoção da colheita mecanizada e sem queima do canavial é inevitável e foi decretada por lei estadual (47.700, de 11 de março de 2003), sendo que durante a queima do canavial, em média, 9kg de CO 2 por tonelada de cana são emitidos para a atmosfera (MOITINHO et al., 2016).A contribuição do solo na emissão de CO 2 para atmosfera é resultado de processos físicos e biológicos. A produção...

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Spatial and Temporal Variability of Soil CO2 Flux in Sugarcane Green Harvest Systems

Cited by 13 publications

References 29 publications

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Response of CO2 efflux from forest and annual crop as a function of water retention capacity and the addition of nitrogen

Classification of soil respiration in areas of sugarcane renewal using decision tree

Análise Geoestatística Da Emissão De Co2 E Macroporosidade De Um Latossolo Vermelho Eutroférrico Sob Cana-De-Açúcar

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