Evaluation of the use of pre- and post-harvest bulk density measurements in wet Eucalyptus obliqua forest in Southern Tasmania

Pennington, P. I.; Laffan, M. D.

doi:10.1016/j.ecolind.2003.11.009

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Our data do suggest that the initial increase in CH 4 uptake rates between the 9‐ and the 44‐year‐old stands are potentially related to an initial change in soil structure, as indicated by a decrease in soil bulk density, possibly in response to a large increase in fine‐root biomass. Studies into the effect of postharvest regeneration burning (burning of harvest residuals to simulate WF) in the same study area have shown that soil bulk density initially increased after the fire treatment followed by a slow decrease over time (Pennington et al ., ; Pennington & Laffan, ). During stand regeneration, soil bulk density actually decreases – caused by an increase in SOM (Gilbert, ; Granged et al ., ), soil aggregation and mixing of the accumulating litter layer (Parnas, ; Chambers & Attiwill, ; Ashton, ).…”

Section: Discussionmentioning

confidence: 99%

Changes in soil moisture drive soil methane uptake along a fire regeneration chronosequence in a eucalypt forest landscape

Fest

Wardlaw

Livesley

et al. 2015

Global Change Biology

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Disturbance associated with severe wildfires (WF) and WF simulating harvest operations can potentially alter soil methane (CH4 ) oxidation in well-aerated forest soils due to the effect on soil properties linked to diffusivity, methanotrophic activity or changes in methanotrophic bacterial community structure. However, changes in soil CH4 flux related to such disturbances are still rarely studied even though WF frequency is predicted to increase as a consequence of global climate change. We measured in-situ soil-atmosphere CH4 exchange along a wet sclerophyll eucalypt forest regeneration chronosequence in Tasmania, Australia, where the time since the last severe fire or harvesting disturbance ranged from 9 to >200 years. On all sampling occasions, mean CH4 uptake increased from most recently disturbed sites (9 year) to sites at stand 'maturity' (44 and 76 years). In stands >76 years since disturbance, we observed a decrease in soil CH4 uptake. A similar age dependency of potential CH4 oxidation for three soil layers (0.0-0.05, 0.05-0.10, 0.10-0.15 m) could be observed on incubated soils under controlled laboratory conditions. The differences in soil CH4 uptake between forest stands of different age were predominantly driven by differences in soil moisture status, which affected the diffusion of atmospheric CH4 into the soil. The observed soil moisture pattern was likely driven by changes in interception or evapotranspiration with forest age, which have been well described for similar eucalypt forest systems in south-eastern Australia. Our results imply that there is a large amount of variability in CH4 uptake at a landscape scale that can be attributed to stand age and soil moisture differences. An increase in severe WF frequency in response to climate change could potentially increase overall forest soil CH4 sinks.

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Section: Discussionmentioning

confidence: 99%

Changes in soil moisture drive soil methane uptake along a fire regeneration chronosequence in a eucalypt forest landscape

Fest

Wardlaw

Livesley

et al. 2015

Global Change Biology

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“…Although instances have been reported in which regeneration on primary snig tracks (i.e., a footprint of the skid trail by crawler skidders) was not different from undisturbed areas 12 years after cessation of harvesting in a wet forest of Eucalyptus sieberi with high amounts of rainfall in Tasmania (Williamson and Neilsen 2003b), bulk densities remained significantly higher in snig tracks and landings after 17-23 years (Pennington and Laffan 2004) and 25 years after timber harvesting (Rab 1992) in wet forests of SE Australia. Under cool temperate conditions, the consequences of soil disturbance by traffic of harvest machinery can persist for decades in clay loam to silt loam soils (Froehlich et al 1985, Greacen and Sand 1980, Rab et al 2004) and recovery processes of soil profiles below wheel tracks may require from 70 to 140 years (Froehlich et al 1985, Webb et al 1986.…”

Section: Introductionmentioning

confidence: 99%

Recovery of soil bulk density, porosity and rutting from ground skidding over a 20-year period after timber harvesting in Iran

Ezzati¹,

Najafi²,

Rab³

et al. 2012

Silva Fenn.

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. 2012. Recovery of soil bulk density, porosity and rutting from ground skidding over a 20-year period after timber harvesting in Iran. Silva Fennica 46(4): 521-538.Ground-based skidding can have detrimental effects on soil properties trough soil profile disturbance and compaction that can persist for decades. We investigated the recovery of physical properties of disturbed brown soils on four abandoned downhill skid trails in a deciduous mountain forest in northern Iran. The most recent skidding operations had taken place 1-5 yrs, 6-10 yrs, 11-15 yrs, and 16-20 yrs ago, providing a 20-year chronosequence with four 5-year recovery periods. For each recovery period, mean values for soil bulk density (BD), total porosity (TP), macroporosity (MP), soil moisture content (SM), and rut depth (RD) were assessed for three levels of traffic intensity (Primary (PS), Secondary (SS) and Tertiary (TS) skid trails) and two levels of slope gradients (Gentle (G) and Steep (S)) and compared to those in undisturbed (control) areas. Over the 20-year recovery period, PS trails on gentle slopes exhibited mean values that were 35-42% (BD), 3-7% (SM), and 13-19 cm (RD) greater and 18-24% (TP) and 19-28% (MP) lower compared to undisturbed areas; on steep PS trails, values were 40-46% (BD), 2-13% (SM), and 13-21 cm (RD) greater and 23-27% (TP) and 28-35% (MP) lower, respectively. While RD and SM recovered, 20 years was not long enough for the other physical soil properties, particularly on steep slopes. To minimize soil disturbance, skidding should be confined to areas with gentle slopes and alternative harvesting methods such as cable yarding should be used where slope gradients exceed 20%.

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“…%Floresta monoespecífica Quando maduras, as 'Florestas monoespecíficas' contribuem para o processo de infiltração de água e proteção do solo (LIMA, 2010). No corte raso ocorrem aumento na concentração de sedimentos em suspensão nos mananciais, perdas de solo e nutrientes, prejudiciais à qualidade da água (PENNINGTON; LAFFAN, 2004;STOTT et al, 2001). Florestas plantadas em áreas onde a floresta natural foi removida podem ajudar a conservação da biodiversidade, fornecendo habitat complementar e aumentando a conectividade entre fragmentos florestais (BROCKERHOFF et al, 2008).…”

Section: Indicadorunclassified

iSAM - Um sistema de indicadores para o monitoramento da Área de Proteção Ambiental Mananciais do Rio Paraíba do Sul

2017

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Resumo: A Área de Proteção Ambiental Mananciais do Rio Paraíba do Sul (APA-MRPS) é um importante instrumento de planejamento territorial ambiental que tem como objetivo proteger os mananciais que abastecem mais de 15 milhões de pessoas no sudeste do Brasil. Este espaço protegido inclui áreas rurais e urbanas, com diferentes contextos sociodemográficos e níveis de conservação. O objetivo deste trabalho foi construir um sistema de indicadores espacialmente explícitos, que auxiliasse o diagnóstico socioambiental e o monitoramento da APA-MRPS. O sistema, intitulado iSAM -Indicadores Socioambientais de Monitoramento da APA-MRPS, consiste em um conjunto de indicadores, construídos a partir de dados de sensoriamento remoto e dados censitários, que pretende identificar e localizar no espaço as condições de proteção dos mananciais e os diferenciais sociodemográficos da população residente. A unidade Jaguari foi selecionada para análise, de modo a demonstrar a capacidade do iSAM de representar os diferenciais socioterritoriais existentes nessa unidade de conservação. O iSAM é indicado para apoiar a gestão e o monitoramento sistemático da APA-MRPS. O arcabouço conceitual criado neste trabalho para lidar com a APA-MRPS, com adaptações, pode ser utilizado para a construção de outros sistemas de indicadores no contexto do monitoramento e planejamento territorial de outras áreas protegidas. Palavras

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Evaluation of the use of pre- and post-harvest bulk density measurements in wet Eucalyptus obliqua forest in Southern Tasmania

Cited by 6 publications

References 13 publications

Changes in soil moisture drive soil methane uptake along a fire regeneration chronosequence in a eucalypt forest landscape

Changes in soil moisture drive soil methane uptake along a fire regeneration chronosequence in a eucalypt forest landscape

Recovery of soil bulk density, porosity and rutting from ground skidding over a 20-year period after timber harvesting in Iran

iSAM - Um sistema de indicadores para o monitoramento da Área de Proteção Ambiental Mananciais do Rio Paraíba do Sul

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