Pre- and post-harvest fine root growth in Eucalyptus grandis stands installed in sandy and loamy soils

Mello, Sérgio Luis de Miranda; Gonçalves, José Leonardo de Moraes; Gava, José Luiz

doi:10.1016/j.foreco.2007.03.060

Cited by 32 publications

(18 citation statements)

References 59 publications

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“…Lower soil moisture was detected in the control plot compared to other plots with different harvest intensity, and this confirms the findings reported by Lopez et al (2003) and Mello et al (2007). The change was caused by removal of the tree canopy and opening of the soil surface to solar radiation, as a consequence of which temperature oscillations increased (Pang et al 2013).…”

Section: Discussionsupporting

confidence: 88%

“…Moreover, Mello et al (2007) observed increased amplitude range in a harvested stand's temperature as compared to that of a mature (control) stand. In our study, however, no clear effect of harvesting on soil temperature in the fifth and sixth year after coppicing was confirmed.…”

Section: Discussionmentioning

confidence: 82%

“…According to Raich & Tufekcioglu (2000), Mello et al (2007) and Inclan et al (2010), the increase in soil respiration in coppice forests may therefore be attributed to various reasons:…”

Section: Discussionmentioning

confidence: 99%

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Different harvest intensity and soil CO2 efflux in sessile oak coppice forests

Dařenová¹,

Čater²,

Pavelka³

2016

iForest

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Soil CO2 efflux accounts for about 45-80% of total ecosystem respiration and is therefore an important part of the ecosystem carbon cycle. Soil CO2 efflux has been poorly studied in forests managed in the ancient coppicing manner. In our study, soil CO2 efflux, temperature, and moisture were measured in sessile oak stands with different harvesting intensity (control: 0% intensity; V1: 75%; V2: 80 %; V3: 85%; and V4: 100%) during the fifth and sixth years after harvesting. Soil CO2 efflux was in the range 2-8 µmol CO2 m -2 s -1 and indicated an increasing pattern with increasing harvesting intensity. The slope of that pattern became less steep from the fifth to the sixth year after harvesting, thus indicating gradual recovery of soil carbon dynamics in the coppiced stand toward the equilibrium state existing before harvesting. Temperature sensitivity of soil CO2 efflux ranged between 2.1 and 2.8, with the lowest values measured in the control stand. Soil CO2 efflux in the control stand was more sensitive to changes in soil moisture than was that on harvested plots. By our calculations, 6.2 tC ha -1 was released from the control stand and 6.2-6.8 tC ha -1 from the harvested stands during the sixth year after harvesting. If mean temperature were to rise by 1 °C, the amount of soil carbon released would increase by 7.7% in the control stand and, depending on harvesting intensity, by 9.0-10.8% in the harvested stands.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 82%

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Different harvest intensity and soil CO2 efflux in sessile oak coppice forests

Dařenová¹,

Čater²,

Pavelka³

2016

iForest

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“…Two rhizotrons were installed around each tree: the first one in a near-vertical position was inclined from the vertical at an angle of 20 • and the second one in a near-horizontal position was inclined from the horizontal at an angle of 30 • . The first rhizotron explored a soil depth of 0.85 m and the second a soil depth of 0.45 m. We used this experimental design because fine root vertical distribution showed a decrease in root density with soil depth Falkiner et al, 2006;Kätterer et al, 1995;Laclau et al, 2001;Mello et al, 2007). Vertical extension of the Eucalyptus root system in this region is very deep, with roots growing below 4 m nine months after planting (Thongo M'Bou, unpublished).…”

Section: Rhizotronmentioning

confidence: 99%

“…They are managed in short rotations, but the sustainability of these highly productive plantations is often questioned in resourcelimited environments, especially in areas characterized by soils with poor nutrient and water holding capacities and by a long dry season like the Kouilou Region in southern Congo. Up to now, studies of Eucalyptus root systems have involved a static description of root distribution and quantification of biomass Laclau et al, 2001;Mello et al, 2007;Moroni et al, 2003;O'Grady et al, 2006;Saint-André et al, 2005;Stape et al, 2004). However, fewer investigations have been made of the environmental control of root dynamics (Fabião et al, 1985;Kätterer et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Root elongation in tropical Eucalyptus plantations: effect of soil water content

et al. 2008

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-• Sustainability of Eucalyptus plantations is often questioned in resource-limited environments, especially in areas characterized by soils with poor nutrient and water holding capacities. Yet, field-based observations of fine root dynamics in relation with the seasonality of rainfall are lacking.• This study was undertaken on two Eucalyptus stands planted in the Kouilou Region (south-western Congo), which is characterized by a four-monthlong dry season. Fine root (less than 2 mm in diameter) dynamics were studied using rhizotron observations of root elongation in the field.• Fine root elongation rates displayed a seasonal variation in the two stands, with higher elongation rates during the rainy season than during the dry season. Positive and significant correlations were found between fine root elongation rates and soil water content at all depths, but a better correlation was found with soil water content in the deep soil horizon than in the superficial horizons.• These results suggest that the temporal variations in fine root elongation were related to the seasonality of rainfall, and they were probably associated with seasonal changes in tree water status, carbon assimilation and belowground allocation. fine roots / growth / rhizotron / Eucalyptus / soil water content Résumé -Élongation des racines dans les plantations tropicales d'Eucalyptus : effet du contenu en eau du sol.• La question de la durabilité des plantations d'Eucalyptus est souvent posée dans les environnements où les ressources sont limitées, en particulier les zones où les sols ont une faible capacité à retenir l'eau et les nutriments et où la saison sèche est longue. Pourtant, les observations in situ de la dynamique racinaire en relation avec la saisonnalité des pluies sont inexistantes.• Cette étude a été réalisée dans deux plantations d'Eucalyptus de la région du Kouilou dans le sud ouest du Congo, qui est caractérisée par quatre mois de saison sèche. La dynamique des racines fines (moins de 2 mm de diamètre) a été étudiée à l'aide de rhizotrons permettant d'observer l'élongation racinaire au champ.• La vitesse d'élongation des racines fines montrait une variation saisonnière dans les deux plantations, avec des vitesses plus élevées en saison des pluies qu'en saison sèche. Des corrélations positives et significatives ont été trouvées entre la vitesse d'élongation des racines fines et la teneur en eau du sol à toutes les profondeurs, mais les meilleures corrélations ont été observées avec la teneur en eau des horizons profonds.• Cela suggère que les variations temporelles de l'élongation des racines fines sont reliées à la saisonnalité des précipitations, et qu'elles sont associées aux changements saisonniers d'état hydrique des arbres, d'assimilation carbonée et d'allocation vers les parties souterraines. racines fines / croissance / rhizotron / Eucalyptus / teneur en eau du sol

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Short‐term carbon emissions: Effect of various tree harvesting, transport, and tillage methods under a eucalyptus plantation

Fialho

Teixeira

et al. 2018

Land Degrad Dev

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Eucalyptus forests stand out for their potential to sequestrate atmospheric CO 2 in soil organic matter throughout their growth. Our study evaluated the harvesting and tillage effect in eucalyptus plantations to the soil CO 2 , 13 C-CO 2 , and CH 4 fluxes. This study was carried out in a eucalyptus plantation, on Typic Haplustox soil. The study used stands cultivated with eucalyptus at the end of the first rotation (7 years), established over degraded pastures. The effect of harvesting was assessed through comparisons of samples taken before and after harvesting with Feller + Skidder (F + S) and Harvester + Forwarder (H + F) methods and separate samples of plant rows (R) and plant interrows (IR). The effect of tillage was assessed through comparisons of R and IR samples taken before and after subsoiling tillage in areas harvested with F + S and H + F methods. A nested experimental design was used with eight replicates. The harvest operation (F + S and H + F methods) in eucalyptus plantationsincreased soil CO 2 fluxes, which were primarily derived from eucalyptus materials ('new C'). The F + S harvesting method resulted in the highest soil density and soil moisture reduction in the IR. The tillage operation (subsoiling) resulted in higher soil CO 2 fluxes in eucalyptus plantations harvest with F + S and H + F methods. However, the H + F method preserved the older soil organic carbon (40.8% in R and 50.4% IR of C 4 -CO 2 ). The soil in the eucalyptus plantations showed soil CH 4 influxes, and the harvest and tillage (subsoiling) operations did not negatively affect the net soil CH 4 influx in the studied eucalyptus plantations.

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Pre- and post-harvest fine root growth in Eucalyptus grandis stands installed in sandy and loamy soils

Cited by 32 publications

References 59 publications

Different harvest intensity and soil CO2 efflux in sessile oak coppice forests

Different harvest intensity and soil CO2 efflux in sessile oak coppice forests

Root elongation in tropical Eucalyptus plantations: effect of soil water content

Short‐term carbon emissions: Effect of various tree harvesting, transport, and tillage methods under a eucalyptus plantation

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