Abstract
The aim of this study was to understand the effects of water stress on plant growth, nutrients distribution and their stoichiometry in different organs of poplar seedlings, and further explore the validation of growth rate hypothesis (GRH) under water stress treatments. Poplar seedlings ( Populus deltoides “Nanlin 3804”) were grown under drought (D), normal water management (CK), low-level flooding (LF), high-level flooding (HF), and high-level flooding followed by flood recovery (FR) treatments in 60 days. Poplar seedling growth, nutrients contents, and stoichiometry among different treatments were analyzed. The seedlings had greater relative growth rate of biomass, height, and stem-basal diameter (BRGR, HRGR, and SRGR, respectively) under flooding treatments, especially in FR treatment ( P < 0.05). Among different organs, stem had the highest BRGR. The N, P, and K concentrations were highest in D treatment ( P < 0.05). Leaves and stems had greater nutrient concentrations and stoichiometries than roots under different treatments ( P < 0.05). The plant stoichiometry were positively correlated with BRGR and HRGR but negatively correlated with SRGR from whole-plant perspective. In organ level, BRGR were negatively correlated with root stoichiometry, but were positively correlated with stem and leaf stoichiometry. Poplar seedlings are suitable for cultivation in relatively moist soil or under short-term periodic flooding conditions. This study provides a scientific basis for the cultivation of high-quality seedlings and the selection of suitable afforestation sites for existing poplar clones.
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Claims 10
Claim · model-written summary
Flooding increased relative growth rates of biomass, height and stem basal diameter, especially after recovery.
- Taxon
- Populus deltoides
Populus deltoidest0 - Treatment
- flooding treatmentse0
- Outcome
- relative growth rate of biomass, height, and stem-basal diametere0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seedlings had greater relative growth rate of biomass, height, and stem-basal diameter (BRGR, HRGR, and SRGR, respectively) under flooding treatments, especially in FR treatment ( P < 0.05)”
t0“Populus deltoides”
Claim · model-written summary
Stem had the highest biomass relative growth rate among organs.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Organ / stage
- steme0
- Outcome
- BRGRe0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem had the highest BRGR”
t0“Populus deltoides”
Claim · model-written summary
Nitrogen, phosphorus and potassium concentrations were highest during drought.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Treatment
- D treatmente0
- Outcome
- N, P, and K concentrationse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N, P, and K concentrations were highest in D treatment ( P < 0.05)”
t0“Populus deltoides”
Claim · model-written summary
Leaves and stems had greater nutrient concentrations and stoichiometries than roots.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- nutrient concentrations and stoichiometriese0
- Direction
- greatere0
- Comparator
- rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves and stems had greater nutrient concentrations and stoichiometries than roots under different treatments ( P < 0.05)”
t0“Populus deltoides”
Claim · model-written summary
Whole plant stoichiometry correlated positively with biomass relative growth rate.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- BRGRe0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant stoichiometry were positively correlated with BRGR and HRGR but negatively correlated with SRGR from whole-plant perspective”
t0“Populus deltoides”
Claim · model-written summary
Whole plant stoichiometry correlated positively with height relative growth rate.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- HRGRe0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant stoichiometry were positively correlated with BRGR and HRGR but negatively correlated with SRGR from whole-plant perspective”
t0“Populus deltoides”
Claim · model-written summary
Whole plant stoichiometry correlated negatively with stem diameter relative growth rate.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- SRGRe0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant stoichiometry were positively correlated with BRGR and HRGR but negatively correlated with SRGR from whole-plant perspective”
t0“Populus deltoides”
Claim · model-written summary
Biomass relative growth rate correlated negatively with root stoichiometry.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- root stoichiometrye0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRGR were negatively correlated with root stoichiometry”
t0“Populus deltoides”
Claim · model-written summary
Biomass relative growth rate correlated positively with stem and leaf stoichiometry.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- stem and leaf stoichiometrye0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were positively correlated with stem and leaf stoichiometry”
t0“Populus deltoides”
Claim · model-written summary
The authors consider moist soil or periodic short flooding suitable for poplar seedling cultivation.
- Taxon
- Populus deltoidesPopulus deltoidest0
- Outcome
- cultivation in relatively moist soil or under short-term periodic flooding conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Poplar seedlings are suitable for cultivation in relatively moist soil or under short-term periodic flooding conditions”
t0“Populus deltoides”