Abstract
This study used three hybrid poplar (Populus × spp.) clones (13 years old) with different parentages planted in three abandoned farmland sites along a regional gradient of elevation and soil fertility in southern Québec (Canada). We evaluated the effects of plantation site and clone on nutrient concentrations in green foliage and leaf litter, on leaf litter mass remaining, on soil properties and on biomass yield. Green foliage and leaf litter nutrient concentrations, and litter decomposition, are under strong genetic and environmental control in hybrid poplars. Clone-specific correlation patterns between green foliage and leaf litter nutrient concentrations were observed, as well as between soil nutrient availability and foliage or leaf litter nutrient concentrations. Despite the wide variations in soil nutrient availability and elevation between sites, only the clone effect was significant on biomass yield. An increase in N and P resorption proficiency with declining soil NO3 and P availability, observed in all clones, could explain stable yields of each clone across sites. The most productive clones (DN × M-915508 and M × B-915311) were more proficient at resorbing N, P and K, while the least productive clone (D × N-131) had the highest N, P and K concentrations in green foliage and in litter. The ability of clone M × B-915311 to maintain high litter Ca and Mg concentrations on sites with soil characterised by lower pH, lower base saturation and lower nutrient availability (NO3, P, Ca and Mg) may also be linked to its high and stable productivity. Differences in litter quality between clones did not yield significant differences in soil properties or in litter mass remaining after 2 years. However, short-term decay trajectories varied between clones. As litter mass remaining was strongly correlated to elevation, the plantation site significantly affected leaf litter mass remaining, which ranged from 4.5 to 35.5% between sites after 2 years.
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Claims 13
Claim · model-written summary
Foliage and litter nutrient concentrations and litter decomposition showed genetic and environmental control.
- Outcome
- Green foliage and leaf litter nutrient concentrations, and litter decompositione0
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Green foliage and leaf litter nutrient concentrations, and litter decomposition, are under strong genetic and environmental control in hybrid poplars.”
Claim · model-written summary
Green foliage and litter nutrient concentrations had clone-specific correlations.
- Material
- Clone-specifice0
- Outcome
- correlation patterns between green foliage and leaf litter nutrient concentrationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clone-specific correlation patterns between green foliage and leaf litter nutrient concentrations were observed”
t0“Hybrid Poplars”
Claim · model-written summary
Soil nutrient availability correlated with foliage or litter nutrient concentrations by clone.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“between soil nutrient availability and foliage or leaf litter nutrient concentrations.”
t0“Hybrid Poplars”
Claim · model-written summary
Only clone significantly affected biomass yield despite site variation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the clone effect was significant on biomass yield.”
t0“Hybrid Poplars”
Claim · model-written summary
N and P resorption proficiency increased as soil NO3 and P availability declined across all clones.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in N and P resorption proficiency with declining soil NO3 and P availability, observed in all clones”
t0“Hybrid Poplars”
Claim · model-written summary
The most productive clones were more proficient at resorbing N, P, and K.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most productive clones (DN × M-915508 and M × B-915311) were more proficient at resorbing N, P and K”
t0“Hybrid Poplars”
Claim · model-written summary
The least productive clone had the highest N, P, and K in foliage and litter.
- Material
- D × N-131e0
- Outcome
- N, P and K concentrations in green foliage and in littere0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the least productive clone (D × N-131) had the highest N, P and K concentrations in green foliage and in litter.”
t0“Hybrid Poplars”
Claim · model-written summary
Clone M × B-915311 maintained high litter Ca and Mg at low-pH, low-fertility sites.
- Material
- M × B-915311e0
- Outcome
- litter Ca and Mg concentrationse0
- Direction
- highe0
- Setting
- sites with soil characterised by lower pH, lower base saturation and lower nutrient availability (NO3, P, Ca and Mg)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“clone M × B-915311 to maintain high litter Ca and Mg concentrations on sites with soil characterised by lower pH, lower base saturation and lower nutrient availability (NO3, P, Ca and Mg)”
t0“Hybrid Poplars”
Claim · model-written summary
Litter-quality differences did not yield significant soil-property differences.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in litter quality between clones did not yield significant differences in soil properties”
t0“Hybrid Poplars”
Claim · model-written summary
Litter-quality differences did not yield significant differences in litter mass after two years.
- Outcome
- litter mass remaininge0
- Direction
- did not yield significant differencese0
- Qualifier
- after 2 yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in litter quality between clones did not yield significant differences in soil properties or in litter mass remaining after 2 years.”
t0“Hybrid Poplars”
Claim · model-written summary
Short-term litter decay trajectories varied between clones.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short-term decay trajectories varied between clones.”
t0“Hybrid Poplars”
Claim · model-written summary
Litter mass remaining was strongly correlated with elevation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“litter mass remaining was strongly correlated to elevation”
t0“Hybrid Poplars”
Claim · model-written summary
Plantation site significantly affected litter mass remaining.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plantation site significantly affected leaf litter mass remaining, which ranged from 4.5 to 35.5% between sites after 2 years.”
t0“Hybrid Poplars”