Untitled

Louahlia, Saïd; Laîné, Philippe; Thornton, Barry; Ourry, Alain; Boucaud, J.

doi:10.1023/a:1004728327955

Cited by 30 publications

(2 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, an increase in functional gene abundance of ammonium oxidising bacteria in response to fertilisation could accelerate transformation of ammonium into nitrate, resulting in lower pH, a decrease in ammonium, and an increase in nitrate in soil (Cameron et al, 2013;Yang et al, 2020;Zou et al, 2022). However, other studies have reported negative or neutral effects of defoliation on soil nitrate concentrations (Cameron et al, 2013;Louahlia et al, 2000). This inconsistency may relate to the difference of defoliation severity and plant age (Conrad-Rooney et al, 2020;Wang et al, 2018).…”

Section: Effects Of Perturbations On Soil Propertiesmentioning

confidence: 99%

Defoliation and fertilisation differentially moderate root trait effects on soil abiotic and biotic properties

Liu,

Cordero,

Bardgett

2023

Journal of Ecology

View full text Add to dashboard Cite

Root functional traits are known to influence soil properties that underpin ecosystem functioning. Yet few studies have explored how root traits simultaneously influence physical, chemical, and biological properties of soil, or how these responses are modified by common grassland perturbations that shape roots, such as defoliation and fertilisation. Here, we explored how root traits of a wide range of grassland plant species with contrasting resource acquisition strategies (i.e. conservative vs. exploitative strategy plant species) respond to defoliation and fertilisation individually and in combination, and examined cascading impacts on a range of soil abiotic and biotic properties that underpin ecosystem functioning. We found that the amplitude of the response of root traits to defoliation and fertilisation varied among plant species, in most cases independently of plant resource acquisition strategies. However, the direction of the root trait responses (increase or decrease) to perturbations was consistent across all plant species, with defoliation and fertilisation exerting opposing effects on root traits. Specific root length increased relative to non‐perturbed control in response to defoliation, while root biomass, root mass density, and root length density decreased. Fertilisation induced the opposite responses. We also found that both defoliation and fertilisation individually enhanced the role of root traits in regulating soil biotic and abiotic properties, especially soil aggregate stability. Synthesis: Our results indicate that defoliation and fertilisation, two common grassland perturbations, have contrasting impacts on root traits of grassland plant species, with direct and indirect short‐term consequences for a wide range of soil abiotic and biotic properties that underpin ecosystem functioning.

show abstract

Section: Effects Of Perturbations On Soil Propertiesmentioning

confidence: 99%

Defoliation and fertilisation differentially moderate root trait effects on soil abiotic and biotic properties

Liu,

Cordero,

Bardgett

2023

Journal of Ecology

View full text Add to dashboard Cite

show abstract

“…N use is driven by the quantity of N forms available in the soil and the capacity of plants to take up different N forms (Vasquez et al, 2008). Within-species pine populations and families can differ in their use of NH 4 + or NO 3 - (Miller and Hawkins, 2007;Maire et al, 2009) because plants can switch their N source (Louahlia et al, 2000) depending on precipitation (Houlton et al, 2007) and season (Lucash et al, 2008), suggesting that plasticity exists in the uptake of different N sources between within-species populations and families from contrasting climates. Plasticity in N use can be driven by withinspecies variation in root morphology, preferential expression of N transporters (NO 3 versus NH 4 + ) (Maire et al, 2009), and/or activity patterns of soil enzymes involved in the acquisition of N (Purahong et al, 2016).…”

Section: Intraspecific Variation In Functional Traits Related To Seedmentioning

confidence: 99%

Effects of Soil Microbes on Functional Traits of Loblolly Pine (Pinus taeda) Seedling Families From Contrasting Climates

et al. 2020

View full text Add to dashboard Cite

Examining factors that influence seedling establishment is essential for predicting the impacts of climate change on tree species' distributions. Seedlings originating from contrasting climates differentially express functional traits related to water and nutrient uptake and drought resistance that reflect their climate of origin and influence their responses to drought. Soil microbes may improve seedling establishment because they can enhance water and nutrient uptake and drought resistance. However, the relative influence of soil microbes on the expression of these functional traits between seedling families or populations from contrasting climates is unknown. To determine if soil microbes may differentially alter functional traits to enhance water and nutrient uptake and drought resistance between dry and wet families, seeds of loblolly pine families from the driest and wettest ends of its geographic range (dry, wet) were planted in sterilized sand (controls) or in sterilized sand inoculated with a soil microbial community (inoculated). Functional traits related to seedling establishment (germination), water and nutrient uptake and C allocation (root:shoot biomass ratio, root exudate concentration, leaf C:N, leaf N isotope composition (d 15 N)), and drought resistance (turgor loss point, leaf carbon isotope composition (d 13 C)) were measured. Then, plants were exposed to a drought treatment and possible shifts in photosynthetic performance were monitored using chlorophyll fluorescence. Inoculated plants exhibited significantly greater germination than controls regardless of family. The inoculation treatment significantly increased root: shoot biomass ratio in the wet family but not in the dry family, suggesting soil microbes alter functional traits that improve water and nutrient uptake more so in a family originating from a wetter climate than in a family originating from a drier climate. Microbial effects on photosynthetic performance during drought also differed between families, as photosynthetic performance of the dry inoculated group declined fastest. Regardless of treatment, the dry family exhibited a greater root:shoot biomass ratio, root exudate concentration, and leaf d 15 N than the wet family. This indicates that the dry family allocated more resources belowground than the wet and the two family may have used different

show abstract

Allocating nitrogen away from a herbivore: a novel compensatory response to root herbivory

2007

View full text Add to dashboard Cite

Centaurea maculosa, an invasive North American plant species, shows a high degree of tolerance to the root-boring biocontrol herbivore, Agapeta zoegana. For example, infested individuals of C. maculosa often exhibit more rigorous growth and reproduction compared with their non-infested counterparts. Compensatory responses to aboveground herbivores often involve increases in leaf area and/or photosynthetic capacity, but considerably less is known about root system compensatory responses to belowground herbivory. We used a (15)N labeling approach to evaluate whether compensatory adjustments in N acquisition via changes in root morphology and/or physiological uptake capacity could explain the ability of C. maculosa to tolerate root herbivory. Root herbivory reduced whole plant N uptake by more than 30% and root uptake capacity by about 50%. Despite a marked reduction in N procurement, herbivory did not affect total biomass or shoot N status. Infested plants maintained shoot N status by shifting more of the acquired N from the root to the shoot. To our knowledge, shifting N allocation away from a root herbivore has not been reported and provides a plausible mechanism for the host plant to overcome an otherwise devastating effect of a root herbivore-induced N deficit.

show abstract

Untitled

Cited by 30 publications

References 33 publications

Defoliation and fertilisation differentially moderate root trait effects on soil abiotic and biotic properties

Defoliation and fertilisation differentially moderate root trait effects on soil abiotic and biotic properties

Effects of Soil Microbes on Functional Traits of Loblolly Pine (Pinus taeda) Seedling Families From Contrasting Climates

Allocating nitrogen away from a herbivore: a novel compensatory response to root herbivory

Contact Info

Product

Resources

About