Hot spots, hot moments, and spatio-temporal controls on soil CO2 efflux in a water-limited ecosystem

Leon, E. Alarcon; Vargas, Rodrigo; Bullock, Stephen H.; Lopez, Eulogio; Panosso, Alan Rodrigo; Scala, Newton La

doi:10.1016/j.soilbio.2014.05.029

Cited by 105 publications

(103 citation statements)

References 45 publications

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“…Nevertheless, the evaluation of soil temperature must be carefully analyzed, since temperature was influenced by soil moisture in both SG-5 (R 2 = 0.85) and SG-10 (R 2 = 0.90) (Figure 4f). This was also detected in study of Leon et al (2014) on temporal and spatial variation of soil CO 2 efflux in a waterlimited Mediterranean ecosystem; they found that the changes in soil volumetric water content influenced the relationship between CO 2 efflux and soil temperature. Epron et al (2004), when studying CO 2 emissions from soil cultivated with eucalyptus, concluded that the bivariate model, including soil temperature and moisture, did not explain the temporal variations in CO 2 emission; the univariate model, with the use of soil moisture, was more efficient.…”

Section: Temporal Variabilitymentioning

confidence: 54%

“…Kosugi et al (2007) demonstrated the complexity of soil respiration patterns, since spatial variability indicates CO 2 emissions are lower where the soil water content is higher; however, in terms of temporal variability, the opposite effect was found, as soil respiration was higher with increasing soil moisture. The mechanisms controlling the spatio-temporal variability of soil CO 2 efflux in water-limited ecosystems is highly complex (Leon et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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

Tavares

Souza

Scala

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:The sugarcane green harvest system, characterized by mechanized harvesting and the absence of crop burning, affects soil quality by increasing crop residue on the soil surface after harvest; thus, it contributes to improving the physical, chemical, and microbiological properties and influences the soil carbon content and CO 2 flux (FCO 2 ). This study aimed to evaluate the spatial and temporal variability of soil FCO 2 in sugarcane green harvest systems. The experiment was conducted in two areas of sugarcane in São Paulo, Brazil: the first had a 5-year history of sugarcane green harvest (SG-5) and the second had a longer history of 10 years (SG-10). The temporal FCO 2 were evaluated in the dry and rainy periods, and spatial variability in the dry period, and related to soil chemical and physical properties, including organic C porosity, bulk density, soil penetration resistance, mean weight diameter of soil aggregates, clay, P, S, Ca, Mg and Fe. The temporal variability indicated no differences between the dry and rainy periods in SG-10, while in SG-5 soil moisture was increased by 33 % in the rainy period. The spatial variability indicated a different pattern from the temporal one, where FCO 2 in SG-10 was correlated with soil temperature, air-filled pore space, total porosity, soil moisture, and the Ca and Mg contents; in the SG-5 area, FCO 2 was correlated with soil mean weight diameter of soil aggregates and the sulfur content.

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Section: Temporal Variabilitymentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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

Tavares

Souza

Scala

et al. 2016

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

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“…In their work with hot spots, hot moments, and spatio-temporal controls on soil respiration in a waterlimited ecosystem, Leon et al (2014) noted that monthly precipitation was the primary drive of the seasonal trend of soil respiration. 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.…”

Section: Discussionmentioning

confidence: 99%

“…Currently, an ultimate objective in carbon cycle science is to understand the spatial and temporal controls of CO 2 dynamics in terrestrial ecosystems (Leon et al, 2014). Thus, a more detailed understanding of the components of the global C balance allows to identify sources and drains of C and develop strategies to mitigate the risks of climate change (Lal, 2004).…”

Section: Introductionmentioning

confidence: 99%

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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“…Saturation of soil pores also determines CO 2 fluxes. According to the literature, the main soil attributes that influence CO 2 fluxes include temperature and content of soil water (Xu and Qi, 2001;Epron et al, 2004Epron et al, , 2006Kosugi et al, 2007;La Scala et al, 2010;Leon et al, 2014), attributes with great influence on microbial activities that promote soil respiration.…”

Section: Introductionmentioning

confidence: 99%

Soil management of sugarcane fields affecting CO2 fluxes

Tavares

Siqueira

Panosso

et al. 2016

Sci. agric. (Piracicaba, Braz.)

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The harvesting system of green sugarcane, characterized by mechanized harvesting and no crop burning, affects soil quality by increasing the remaining straw left on the soil surface after harvesting, thus, contributing to the improvement of physical, chemical, and microbiological soil attributes, influencing CO 2 fluxes. This study aimed to evaluate CO 2 fluxes and their relation to soil properties in sugarcane crops under different harvesting managements: burned (B), Green harvesting for 5 years (G-5) and Green harvesting for ten years (G-10). For this, a 1 ha sampling grid with 30 points was installed in each area, all located in the Northeast of São Paulo State, Brazil. In each point, CO 2 fluxes were measured and the soil was sampled to analyze the microbial biomass, physical (soil moisture and temperature, mean weight diameter, bulk density, clay, macroporosity and microporosity) and chemical characterization (pH, organic C, base saturation and P). The CO 2 fluxes were divided into four quantitative criteria: high, moderate, low and very low from the Statistical Division (mean, first quartile, median and third quartile) and the other data were classified according this criterion. The Principal Component Analysis (PCA) was used to identify the main soil attributes that influence CO 2 fluxes. The results showed that G-10 CO 2 fluxes were 28 and 41 % higher than those in the G-5 and B treatments, respectively.The PCA analysis showed that macroporosity was the main soil attribute that influenced the high CO 2 fluxes.

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Hot spots, hot moments, and spatio-temporal controls on soil CO2 efflux in a water-limited ecosystem

Cited by 105 publications

References 45 publications

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

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

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

Soil management of sugarcane fields affecting CO2 fluxes

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