Rapid root elongation by phreatophyte seedlings does not imply tolerance of water table decline

Canham, Caroline A.; Froend, Raymond H.; Stock, William D.

doi:10.1007/s00468-015-1161-z

Cited by 14 publications

(13 citation statements)

References 36 publications

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“…On the other hand, the proportion of live fine-roots in the 0-20 cm soil layer in the present study increased in summer or rainy season (Figure 1b), when the soil moisture content was higher due to high rainfall ( Figure 2). The dependence of fine-root production on the soil water content and fertility has previously been reported by Canham et al (2015), who found higher levels of fine-root production in soil with higher moisture content and fertility. Similarly, Nguyen et al (2019) observed higher levels of fine-root production in a plantation during rainy season compared with dry season and in a fertilisation treatment compared with a non-fertilisation treatment and concluded that this was due to the greater ability of larger numbers of fine-roots to absorb nutrients and water efficiently.…”

Section: Discussionsupporting

confidence: 63%

Fine-Root Vertical Profile, Production, Mortality and Decomposition in an Acacia Plantation in North-East Vietnam

Tran¹

2020

JTFS

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Fine-roots drive plant growth and influence the global carbon cycle. Thus understanding their production and distribution is useful for plantation management. Therefore, in the present study, the vertical distribution and production of fine-roots were investigated in a 2-year-old Acacia plantation in Vietnam that had a planting density of 1100 trees ha-1. A 30 m × 30 m plot was established in the plantation and field data were collected using sequential soil core sampling and the litter bag technique. The continuous inflow method was used to estimate fine-root production, mortality and decomposition during spring, summer, fall and winter. More than 78.0% of the fine-roots were distributed in the 0-20 cm soil layer while less than 4.0% were distributed in the 50-80 cm later. The proportion of fine-roots in the 0-20 cm layer was greater in summer (81.0%) than in winter (78.0%), while the reverse was true in the 50-80 cm layer (summer 2.3%, winter 3.6%). The total fine-root production, mortality and decomposition in the study area were 9.90, 8.39 and 7.07 tonnes ha-1 year-1 respectively and all three of these parameters were seasonally dependent, being higher in summer (> 2.5 g m-2 day-1) than in winter (< 1.5 g m-2 day-1).

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Section: Discussionsupporting

confidence: 63%

Fine-Root Vertical Profile, Production, Mortality and Decomposition in an Acacia Plantation in North-East Vietnam

Tran¹

2020

JTFS

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“…E. grandis trees are better adapted to the cold climate in winter at our study site than A. mangium trees, which could account for the higher fine-root production in the topsoil in E. grandis monoculture and mixed-species stands than in A. mangium monoculture. A strong influence of exogenous factors such as soil temperature and water content (Canham et al 2015), as well as endogenous factors such as photosynthate availability, on fine-root phenology is well documented (McCormack et al 2015).…”

Section: Fine-root Productionmentioning

confidence: 99%

“…Root growth is controlled by endogenous constraints on carbon availability and environmental factors (Freschet et al 2017;McCormack et al 2015). Fineroot production is dependent on soil water content (Canham et al 2015) and the high plasticity of fine roots enables them to explore resource-rich soil patches has been demonstrated (Hodge 2004). The capacity of A. mangium and E. grandis roots to explore soil patches might therefore vary depending on the season and the depth in the soil.…”

Section: Introductionmentioning

confidence: 99%

Consequences of mixing Acacia mangium and Eucalyptus grandis trees on soil exploration by fine-roots down to a depth of 17 m

et al. 2017

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Background and aims Fine-root functioning is a major driver of plant growth and strongly influences the global carbon cycle. While fine-root over-yielding has been shown in the upper soil layers of mixedspecies forests relative to monospecific stands, the consequences of tree diversity on fine-root growth in very deep soil layers is still unknown. Our study aimed to assess the consequences of mixing Acacia mangium and Eucalyptus grandis trees on soil exploration by roots down to the water table at 17 m depth in a tropical planted forest. Method Fine roots (diameter < 2 mm) were sampled in a randomized block design with three treatments: monospecific stands of Acacia mangium (100A), Eucalyptus grandis (100E), and mixed stands with 50% of each species (50A50E). Root ingrowth bags were installed at 4 depths (from 0.1 m to 6 m) in the three treatments within three different blocks, to study the fine-root production over 2 periods of 3 months. Results Down to 17 m depth, total fine-root biomass was 1127 g m −2 in 50A50E, 780 g m −2 in 100A and 714 g m −2 in 100E. Specific root length and specific root area were 110-150% higher in 50A50E than in 100A for Acacia mangium trees and 34% higher in 50A50E than in 100E for Eucalyptus grandis trees. Ingrowth bags showed that the capacity of fine roots to explore soil patches did not decrease down to a depth of 6 m for the two species. Conclusions Belowground interactions between Acacia mangium and Eucalyptus grandis trees greatly increased the exploration of very deep soil layers by fine roots, which is likely to enhance the uptake of soil resources. Mixing tree species might therefore increase the resilience of tropical planted forests through a better exploration of deep soils.

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“…Although strictly lignotuberous Banksia species are most likely to occur in the drier environments of SWA (Lamont and Markey ), lignotuber presence in adult B. attenuata plants is not correlated with long‐term average rainfall or maximum temperatures (Table ). The seedlings of lignotuberous species are less tolerant of drought than nonsprouters, possibly because early growth resources are used for lignotuber rather than rapid taproot growth that is critical for early survival (Enright and Lamont ; Canham et al ). Walters et al () reported that water and nutrient availabilities did not affect the lignotuber growth and resprouting ability of some eucalypt species.…”

Section: Discussionmentioning

confidence: 99%

Environmental drivers and genomic architecture of trait differentiation in fire‐adaptedBanksia attenuataecotypes

Lamont²,

Enright

et al. 2018

JIPB

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Trait divergence between populations is considered an adaptive response to different environments, but to what extent this response is accompanied by genetic differentiation is less clear since it may be phenotypic plasticity. In this study, we analyzed phenotypic variation between two Banksia attenuata growth forms, lignotuberous (shrub) and epicormic resprouting (tree), in fire-prone environments to identify the environmental factors that have driven this phenotypic divergence. We linked genotype with phenotype and traced candidate genes using differential gene expression analysis. Fire intervals determined the phenotypic divergence between growth forms in B. attenuata. A genome-wide association study identified 69 single nucleotide polymorphisms, putatively associated with growth form, whereas no growth form- or phenotype-specific genotypes were identified. Genomic differentiation between the two growth forms was low (F = 0.024). Differential gene expression analysis identified 37 genes/transcripts that were differentially expressed in the two growth forms. A small heat-shock protein gene, associated with lignotuber presence, was differentially expressed in the two forms. We conclude that different fire regimes induce phenotypic polymorphism in B. attenuata, whereas phenotypic trait divergence involves the differential expression of a small fraction of genes that interact strongly with the disturbance regime. Thus, phenotypic plasticity among resprouters is the general strategy for surviving varying fire regimes.

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Rapid root elongation by phreatophyte seedlings does not imply tolerance of water table decline

Cited by 14 publications

References 36 publications

Fine-Root Vertical Profile, Production, Mortality and Decomposition in an Acacia Plantation in North-East Vietnam

Fine-Root Vertical Profile, Production, Mortality and Decomposition in an Acacia Plantation in North-East Vietnam

Consequences of mixing Acacia mangium and Eucalyptus grandis trees on soil exploration by fine-roots down to a depth of 17 m

Environmental drivers and genomic architecture of trait differentiation in fire‐adaptedBanksia attenuataecotypes

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