Fine root production and turnover in Brazilian Eucalyptus plantations under contrasting nitrogen fertilization regimes

Jourdan, Christophe; Silva, E.V.; Gonçalves, José Leonardo de Moraes; Ranger, Jacques; Moreira, Rildo Moreira e; Laclau, Jean‐Paul

doi:10.1016/j.foreco.2008.04.034

Cited by 102 publications

(84 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Root turnover is difficult to determine because few studies have been carried out, and the values vary substantially depending on the methodology used. Jourdan et al (2008) observed differences as large as 0.7-1.8 year -1 depending on methodology used for Eucalyptus plantations in Brazil. The root turnover rate is generally greater than that of leaf turnover (Swift et al 1979).…”

Section: Discussionmentioning

confidence: 90%

See 1 more Smart Citation

Carbon balance for different management practices for fast growing tree species planted on former pastureland in southern Europe: a case study using the CO2Fix model

et al. 2012

View full text Add to dashboard Cite

Although it is known that forestry mitigates carbon emissions to some degree, there is still a need to investigate the extent to which changes in forest management regimes affect the carbon cycle. In a climate-change scenario, forest management schemes must be optimized to maximize product supply and minimize environmental impacts. It is difficult to predict the mitigating effects of different silvicultural regimes because of differences in the growth characteristics of each species, destination of products, and industrial efficiencies. The objective of the present study was to use a modeling approach to evaluate the effects of different management regimes for fast growing species in southern temperate Europe in relation to mitigating climate change. A comprehensive study was carried out considering the C sink effect in biomass, soil and wood products, the substitutive effect of bioenergy, and particular conditions of the forest industry in southern Europe. The mechanistic CO 2 Fix model was parameterized for three species used in fast growing plantations in southern Europe: Eucalyptus globulus, Eucalyptus nitens, and Pinus radiata. Data from 120 plots covering the complete age range observed for each species were used to calculate changes in C stocks in aboveground biomass and organic and mineral soil and to validate the parameterized model for these conditions. Additional information about the efficiency of forest industry processes in the region was also considered. A strong bias in soil organic carbon estimation was observed and attributed to overestimations in the decomposition rates of soil compartments. Slight bias was also observed in the carbon biomass estimation when forest-specific yield models were used to simulate afforestation over former pastureland. As regards the model sensitivity, the Yasso model was strongly robust to turnover of leaves, roots, and branches. The chip wood production alternative yielded higher carbon stock in biomass and products, as well as in bioenergy substitution effect, than the sawn wood production alternative. Nevertheless, the sawn wood alternative was the most effective as regards the C stock in the soil. Site index had an important effect for all species, alternatives, and compartments, and mitigating effects increased with site index. Harvesting of clearcutting and thinning slash for bioenergy use led to a slight decrease in the soil carbon equilibrium but significantly increased the mitigation effect through bioenergy use.

show abstract

Section: Discussionmentioning

confidence: 90%

“…Root turnover (RT) is not easy to determine, even when a specific experimental design is followed, and results vary greatly depending on the methodology used (Jourdan et al 2008). The turnover rate of total root systems depends on the turnover rate of each root size.…”

Section: Soil Module Parameterizationmentioning

confidence: 99%

Carbon balance for different management practices for fast growing tree species planted on former pastureland in southern Europe: a case study using the CO2Fix model

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Sludge applications are only required the first year of the rotation (every 6 to 7 years), whereas doses of the same order of magnitude may be applied annually for agricultural crops. Forest plantations are usually located on low fertile sandy soils and a fast development of Eucalyptus roots makes it possible to take up the nutrients released during sludge decomposition [5].…”

Section: Introductionmentioning

confidence: 99%

Applying Sewage Sludge toEucalyptus grandisPlantations: Effects on Biomass Production and Nutrient Cycling through Litterfall

Silva

Poggiani²,

Laclau

2011

Applied and Environmental Soil Science

View full text Add to dashboard Cite

In most Brazilian cities sewage sludge is dumped into sanitary landfills, even though its use in forest plantations as a fertilizer and soil conditioner might be an interesting option. Sewage sludge applications might reduce the amounts of mineral fertilizers needed to sustain the productivity on infertile tropical soils. However, sewage sludge must be applied with care to crops to avoid soil and water pollution. The aim of our study was to assess the effects of dry and wet sewage sludges on the growth and nutrient cycling of Eucalyptus grandis plantations established on the most common soil type for Brazilian eucalypt plantations. Biomass production and nutrient cycling were studied over a 36-month period in a complete randomized block design. Four experimental treatments were compared: wet sewage sludge, dry sludge, mineral fertilizer, and no fertilizer applications. The two types of sludges as well as mineral fertilizer increased significantly the biomass of Eucalyptus trees. Wood biomass productions 36 months after planting were similar in the sewage sludge and mineral fertilization treatments (about 80 tons ha −1 ) and 86% higher than in the control treatment. Sewage sludge application also affected positively leaf litter production and significantly increased nutrient transfer among the components of the ecosystem.

show abstract

“…High residue addition and C accretion by annual crops in more superficial soil layers may lead to saturation of some SOM sorption surfaces, especially in the clay fraction (Dieckow et al, 2005), while C deposition deeper in the soil profile by eucalyptus roots may circumvent this limitation and extend the period of net C sequestration. In a study carried out in a Brazilian eucalyptus plantation to evaluate the fine root production and turnover under contrasting N fertilization systems, Jourdan et al (2008) observed 1.67 and 1.61 t ha -1 of fine root biomass (diameter < 1 mm) down to a depth of 3 m one year after planting, in a control (no nitrogen) and N-fertilized area, respectively. Evaluating C accumulation under zerotillage and conventional tillage in subtropical agriculture (15-26 years) in Southern Brazil, Boddey et al (2010) observed annual soil C accumulation rates of 0.04 to 0.88 Mg ha -1 under no-tillage to a depth of 30 cm in comparison to conventional tillage.…”

Section: Discussionmentioning

confidence: 99%

Modeling changes in organic carbon stocks for distinct soils in southeastern brazil after four eucalyptus rotations using the century model

Lima

Silva

Stape

et al. 2011

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Soil organic matter (SOM) plays an important role in carbon (C) cycle and soil quality. Considering the complexity of factors that control SOM cycling and the long time it usually takes to observe changes in SOM stocks, modeling constitutes a very important tool to understand SOM cycling in forest soils. The following hypotheses were tested: (i) soil organic carbon (SOC) stocks would be higher after several rotations of eucalyptus than in low-productivity pastures; (ii) SOC values simulated by the Century model would describe the data better than the mean of observations. So, the aims of the current study were: (i) to evaluate the SOM dynamics using the Century model to simulate the changes of C stocks for two eucalyptus chronosequences in the RESUMO: MODELAGEM DAS MUDANÇAS NOS ESTOQUES DE CARBONO ORGÂNICO DE SOLOS DISTINTOS APÓS QUATRO ROTAÇÕES DO EUCALIPTO NO SUDESTE DO BRASIL COM O MODELO CENTURY A matéria orgânica do solo (MOS) tem importantes funções no ciclo de C e na qualidade do solo. Considerando a complexidade dos fatores que controlam a ciclagem da MOS e o tempo necessário para que as mudanças sejam nela observadas, a modelagem constitui uma ferramenta muito importante para entender a ciclagem da MOS em solos florestais. As hipóteses do estudo foram: o cultivo do eucalipto por várias rotações resultaria no aumento dos estoques de C do solo, quando comparado a pastagens degradadas; e os valores dos estoques de C do

show abstract

Fine root production and turnover in Brazilian Eucalyptus plantations under contrasting nitrogen fertilization regimes

Cited by 102 publications

References 51 publications

Carbon balance for different management practices for fast growing tree species planted on former pastureland in southern Europe: a case study using the CO2Fix model

Carbon balance for different management practices for fast growing tree species planted on former pastureland in southern Europe: a case study using the CO2Fix model

Applying Sewage Sludge toEucalyptus grandisPlantations: Effects on Biomass Production and Nutrient Cycling through Litterfall

Modeling changes in organic carbon stocks for distinct soils in southeastern brazil after four eucalyptus rotations using the century model

Contact Info

Product

Resources

About