Fine-root dynamics, soil moisture and soil carbon content in a Eucalyptus globulus plantation under different irrigation and fertilisation regimes

Kätterer, Thomas; Fabião, António; Madeira, M.; Ribeiro, Carlos Antônio Álvares Soares; Steen, E.

doi:10.1016/0378-1127(95)03529-j

Cited by 72 publications

(41 citation statements)

References 22 publications

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“…This was consistent with previous observations in tropical areas such as the Brazilian Cerrado (Delitti et al, 2001) or in a lowland dipterocarp forest in Sabah (Green et al, 2005), which linked fine root dynamics with rainfall and seasonal changes in soil water content. These results also agreed with those found for Mediterranean ecosystems (Lopez et al, 1998) or in a Eucalyptus globulus plantation in Portugal, where fine root growth in spring and summer was dependent on water supply (Kätterer et al, 1995). Our results contrasted with findings for temperate ecosystems, where fine root growth is strongly affected by soil temperature (Burke and Raynal, 1994).…”

Section: Discussionsupporting

confidence: 91%

“…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root system in this region is very deep, with roots growing below 4 m nine months after planting (Thongo M'Bou, unpublished).…”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%

“…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). This study, conducted on two Eucalyptus stands in the Kouilou Region (Congo), set out to characterize seasonal variations in fine root (less than 2 mm in diameter) elongation using rhizotrons in the field.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 91%

Section: Rhizotronmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2008

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“…Some authors argued that fertilization or irrigation may alter eucalypt fine-root distribution, causing a higher concentration of fine-roots in planting row areas near the stump [24,42,59,60]. This could be a reasonable explanation for the higher FRD in planting row found in our study, however we could not see a decreasing gradient in FRD from planting row to inter row or diagonal positions (Figure 4).…”

Section: Fine-root Biomass and Spatial Distributioncontrasting

confidence: 56%

Nitrogen Alters Initial Growth, Fine-Root Biomass and Soil Organic Matter Properties of a Eucalyptus dunnii Maiden Plantation in a Recently Afforested Grassland in Southern Brazil

Ferreira

Oliveira

Silva

et al. 2018

Forests

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Nitrogen (N) fertilization effects on Eucalyptus growth and soil carbon (C) stocks are still controversial. We set up an N fertilization experiment in southern Brazil to evaluate initial tree growth and changes in soil organic matter (SOM). Four N levels (24-Reference, 36, 48 and 108 kg ha −1 of N) were tested and tree growth was assessed during the first two years. Afterwards, representative trees were chosen to evaluate fine-root biomass (FRB) and its spatial distribution. Soil was sampled to a 40-cm depth and SOM was fractionated in Particulate (POM) and Mineral-Associated Organic Matter (MAOM) for C and N content, and δ 13 C determination. Positive N effect on tree growth was seen only for tree height. N addition resulted in higher FRB. Changes in SOM were more expressive in top-soil layers. Overall, afforestation had positive effects on soil C. Increasing reference N dose resulted in higher C and N content in both SOM fractions. C and N dynamics were tightly correlated, especially in MAOM. Eucalypt-derived C was on average three-fold higher in POM. In summary, we showed that N fertilization may have positive but limited effects on tree growth, nevertheless it enhances fine-root biomass and C and N accumulation in SOM pools.

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“…Soil water availability is probably the most important factor that accounts for changes in fine-root production strategies (Dowdy et al 1995;Kätterer et al 1995). According to Joslin et al (2000), some species respond to drought by increasing root length, resulting in increased root:shoot ratio.…”

Section: Discussionmentioning

confidence: 99%

Fine-root production in two secondary forest sites with distinct ages in Eastern Amazon

2012

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The objective of this work was to assess the fine-root (≤ 2 mm diameter) production dynamics of two forest regrowths at different ages. Fine-root production was monitored by the ingrowth core method in one 18-year-old site (2 ha) and one 10-year-old site (0.5 ha), both localized in the Apeú region, Northern Pará State, Brazil. The sites were abandoned after successive shifting cultivation, beginning in 1940. Monthly production of live fine-root was similar between sites and was influenced by rainfall seasonality, with higher production during the dry season than the wet season for mass and length. However, mortality in terms of mass was higher in the 10-year-old site than in the 18-year-old site. The seasonality influenced mortality only in the 18-year old site following the pattern observed for live fine-root. The influence seasonal on mortality in terms of length was different between sites, with higher mortality during the wet season in the 10-year-old site and higher mortality during the dry season in the 18-year-old site. Specific root length was higher during the wet season and at the 10-year-old site. Fine-root production was not influenced by the chronosequence of the sites studied, probably fine-root production may have already stabilized in the sites or it depended more on climate and soil conditions. The production of fine-roots mass and length were indicators that generally showed the same pattern. Keywords: drought, root biomass, seasonality, succession, tropical forest Produção de raízes finas em dois sítios de floresta secundária com diferentes idades na Amazônia Orientalresumo O objetivo deste trabalho foi avaliar a dinâmica de produção de raízes finas (diâmetro ≤ 2 mm) em duas áreas de floresta secundária com diferentes idades. A produção de raízes finas foi monitorada utilizando a técnica de ingrowth core em um sítio com 18 anos de idade (2 ha) e um outro sítio com 10 anos de idade (0,5 ha), localizados na região de Apeú, nordeste do Estado do Pará. Os sítios foram abandonados depois de sucessivos ciclos agrícolas, iniciados em 1940. A produção mensal de raízes vivas foi semelhante entre os sítios e influenciada pela sazonalidade pluviométrica, com maior produção durante a estação seca para massa e comprimento. No entanto, a mortalidade, em termos de massa, foi maior no sítio de 10 anos. A sazonalidade influenciou a mortalidade somente no sítio de 18 anos, seguindo o padrão observado para as raízes vivas. A influência sazonal sobre a mortalidade em termos de comprimento foi diferente entre os sítios, com maior mortalidade durante a estação chuvosa no sítio de 10 anos e maior mortalidade durante a estação seca no sítio de 18 anos. O comprimento radicular específico foi maior durante a estação chuvosa e influenciado pelos sítios, sendo maior no sítio de 10 anos. A produção de raízes finas não foi influenciada pela cronossequência dos sítios estudados, provavelmente porque a produção de raízes finas pode ter estabilizado nos sítios ou depende mais das condições de clima e solo. A produção,...

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Fine-root dynamics, soil moisture and soil carbon content in a Eucalyptus globulus plantation under different irrigation and fertilisation regimes

Cited by 72 publications

References 22 publications

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

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

Nitrogen Alters Initial Growth, Fine-Root Biomass and Soil Organic Matter Properties of a Eucalyptus dunnii Maiden Plantation in a Recently Afforested Grassland in Southern Brazil

Fine-root production in two secondary forest sites with distinct ages in Eastern Amazon

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