Carbon dioxide emission related to chemical properties of a tropical bare soil

Scala, Newton La; Marques, João José; Pereira, Gener Tadeu; Corá, José Eduardo

doi:10.1016/s0038-0717(00)00053-5

Cited by 70 publications

(50 citation statements)

References 8 publications

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“…Nevertheless, the spatial variability analysis showed that soil temperature and moisture influenced FCO 2 only in SG-10. In some studies, soil FCO 2 was positively correlated with the organic carbon (OC) content (La Scala Jr et al, 2000b;Medeiros et al, 2011;Lenka and Lal, 2013). In this study, however, SG-10 presented a lower OC content and greater FCO 2 .…”

Section: Spatial Variabilitycontrasting

confidence: 49%

“…A spherical model for FCO 2 was also adjusted to semivariograms in studies performed by Kosugi et al (2007) and La Scala Jr et al (2000a). Furthermore, the degree of spatial dependence was moderate, which was also found by Panosso et al (2009) and La Scala Jr et al (2000b). Although studies have reported differences of range in CO 2 spatial variability during the dry and rainy periods (Kosugi et al, 2007;Ohashi and Gyokusen, 2007), in this study, the range was of 25 m for both periods.…”

Section: Spatial Variabilitymentioning

confidence: 57%

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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: Spatial Variabilitycontrasting

confidence: 49%

Section: Spatial Variabilitymentioning

confidence: 57%

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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“…of the salt marsh soils. The present findings of CO 2 emissions can be compared with the results of Scala et al (2000) who measured CO 2 emissions ranged from 137 to 3455 g m -2 a -1…”

Section: Emissions Of Cosupporting

confidence: 63%

Influence of salt marsh ecosystem on the concentration and emission of CO2 from the Wadden sea coast soil of northern Germany

Khan

2017

Bangladesh J. Sci. Res.

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A field study was conducted to evaluate the possible factors controlling the fluxes of carbon dioxide along a toposequence of daily to seasonally flooded coastal salt marsh soils. The soil at the top end of the salt marsh (with a height of 1.8 m above sea level (a.s.l.) and a dense vegetation cover) was salic silty to clayic (Typic Sulfaquent), while the soil at the bottom end (with some salt bushes and a 1.4 m a.s.l.) was sandy to silty (Haplic Sulfaquent). The mean (depth: 0 -100 cm) values of pH were around 7, and of redox potentials (Eh) in the Typic Sulfaquent ranged from -162 to + 104 mV during all the seasons. The average net-emission of CO 2 (-14.0 g m -2 a -1 ) above the vegetation cover was negative for the Haplic Sulfaquent but highly positive for Typic Sulfaquent round the year (857 g m -2 a -1 ). The average maximum concentrations of CO 2 were detected within the surface soils 20 to 40 cm in both the profiles. In the surface soils of 0 to 20 cm the concentrations of CO 2 measured were relatively low though the values were about 5 to 20 times higher than that of the atmospheric (0.35 g/v) concentration. For the average of two Haplic Sulfaquents, the soil temperatures were almost 2°C higher than that of the Typic Sulfaquent and it was also 2.5°C higher than the mean annual temperature (9.5°C) of the soils. The current results show that the CO 2 fluxes seasonally varied significantly and for certain periods of the year the coastal salt marsh soils can act either as a sink or source for atmospheric CO 2 depending on the physical and chemical properties of the soils.

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“…Long-term litter harvesting in China decreased soil respiration by 40-63% (Mao et al, 1992), and litter removal experiments in tropical forests measured a decrease in soil respiration of 28% after one year (Vasconcelos et al, 2004) and 54% after seven years (Li et al, 2004). Long-term changes in litter inputs may also influence soil respiration rates by modifying soil temperature and soil water content (Schlentner & Van Cleve, 1985), pH (Kowalenko, Ivarson & Cameron, 1978), nutrient availability (Singh & Gupta, 1977), soil carbon content, and cation exchange capacity (La Scala et al, 2000). These secondary effects of litter on soil respiration rates complicate predictions and estimates of the long-term consequences of changes to litter inputs.…”

Section: The Carbon Cyclementioning

confidence: 99%

Using experimental manipulation to assess the roles of leaf litter in the functioning of forest ecosystems

Sayer¹

2005

Biol. Rev.

627

494

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The widespread use of forest litter as animal bedding in central Europe for many centuries gave rise to the first litter manipulation studies, and their results demonstrated that litter and its decomposition are a vital part of ecosystem function. Litter plays two major roles in forest ecosystems: firstly, litterfall is an inherent part of nutrient and carbon cycling, and secondly, litter forms a protective layer on the soil surface that also regulates microclimatic conditions. By reviewing 152 years of litter manipulation experiments, I show that the effects of manipulating litter stem from changes in one, or both, of these two functions, and interactions between the variables influenced by the accumulation of litter can result in feedback mechanisms that may intensify treatment effects or mask responses, making the interpretation of results difficult.Long-term litter removal increased soil bulk density, overland flow, erosion, and temperature fluctuations and upset the soil water balance, causing lower soil water content during dry periods. Soil pH increased or decreased in response to manipulation treatments depending on forest type and initial soil pH, but it is unclear why there was no uniform response. Long-term litter harvesting severely depleted the forests of nutrients. Decreases in the concentrations of available P, Ca, Mg, and K in the soil occurred after only three to five years. The decline in soil N occurred over longer periods of time, and the relative loss was greater in soils with high initial nitrogen concentration. Tree growth declined with long-term litter removal, probably due to lower nutrient availability. Litter manipulation also added or removed large amounts of carbon thereby affecting microbial communities and altering soil respiration rates.Litter manipulation experiments have shown that litter cover acts as a physical barrier to the shoot emergence of small-seeded species ; further, the microclimate maintained by the litter layer may be favourable to herbivores and pathogens and is important in determining later seedling survival and performance. Litter manipulation altered the competitive outcomes between tree seedlings and forbs, thereby influencing species composition and diversity ; changes in the species composition of understorey vegetation following treatments occurred fairly rapidly. By decreasing substrate availability and altering the microclimate, litter removal changed fungal species composition and diversity and led to a decline in populations of soil fauna. However, litter addition did not provoke a corresponding increase in the abundance or diversity of fungi or soil fauna.Large-scale long-term studies are still needed in order to investigate the interactions between the many variables affected by litter, especially in tropical and boreal forests, which have received little attention. Litter manipulation treatments present an opportunity to assess the effects of increasing primary production in forest ecosystems; specific research aims include assessing the eff...

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Carbon dioxide emission related to chemical properties of a tropical bare soil

Cited by 70 publications

References 8 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

Influence of salt marsh ecosystem on the concentration and emission of CO2 from the Wadden sea coast soil of northern Germany

Using experimental manipulation to assess the roles of leaf litter in the functioning of forest ecosystems

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