Abstract
Plant root morphology and mechanics are key determinants of slope stability. Soil phosphorus availability is typically limited in high-altitude regions subjected to engineering disturbances. Understanding how phosphorus supply shapes root traits is therefore crucial for enhancing vegetation restoration and slope stabilization in disturbed landscapes. A seven-year phosphorus addition experiment was conducted to examine the responses of Lespedeza bicolor Turcz. to five phosphorus supply levels (0, 2, 4, 6, and 8 g m –2 yr –1 ). The morphological traits (length, diameter, number), tensile strength, and chemical composition (cellulose, hemicellulose, lignin contents) were analyzed in taproots, first-, and second-order lateral roots. Most root traits exhibited a unimodal response to phosphorus supply, while lignin content showed an inverse trend. At a phosphorus supply level of 2 g m –2 yr –1 , the root biomass, length, and number of L. bicolor reached their maximum values, likely due to adaptive responses under mild phosphorus deficiency. Under severe phosphorus deficiency or excess, root growth was inhibited because of weakened metabolism or phosphorus toxicity. Root tensile strength correlated positively with cellulose content but negatively with lignin content, suggesting the critical role of chemical composition in modulating root tensile strength. Overall, L. bicolor grown at the phosphorus supply level of 2 g m –2 yr –1 displayed optimal growth performance and erosion-reducing potential, with the greatest root biomass, fine root proportion, and tensile strength.
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Claims 12
Claim · model-written summary
Most root traits followed a unimodal response to phosphorus supply.
- Taxon
- Lespedeza bicolor Turcz.
Lespedeza bicolort0 - Treatment
- phosphorus supplye0
- Outcome
- Most root traitse0
- Direction
- unimodal responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most root traits exhibited a unimodal response to phosphorus supply, while lignin content showed an inverse trend”
t0“Lespedeza bicolor turcz.”
Claim · model-written summary
Root lignin content showed the inverse pattern across phosphorus supply.
- Taxon
- Lespedeza bicolor Turcz.Lespedeza bicolort0
- Treatment
- phosphorus supplye0
- Outcome
- lignin contente0
- Direction
- inverse trende0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most root traits exhibited a unimodal response to phosphorus supply, while lignin content showed an inverse trend”
t0“Lespedeza bicolor turcz.”
Claim · model-written summary
root biomass peaked at 2 g m –2 yr –1 phosphorus.
- Taxon
- L. bicolorLespedeza bicolore0
- Treatment
- 2 g m –2 yr –1e0
- Outcome
- root biomasse0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a phosphorus supply level of 2 g m –2 yr –1 , the root biomass, length, and number of L. bicolor reached their maximum values”
Claim · model-written summary
length peaked at 2 g m –2 yr –1 phosphorus.
- Taxon
- L. bicolorLespedeza bicolore0
- Treatment
- 2 g m –2 yr –1e0
- Outcome
- lengthe0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a phosphorus supply level of 2 g m –2 yr –1 , the root biomass, length, and number of L. bicolor reached their maximum values”
Claim · model-written summary
number peaked at 2 g m –2 yr –1 phosphorus.
- Taxon
- L. bicolorLespedeza bicolore0
- Treatment
- 2 g m –2 yr –1e0
- Outcome
- numbere0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a phosphorus supply level of 2 g m –2 yr –1 , the root biomass, length, and number of L. bicolor reached their maximum values”
Claim · model-written summary
severe phosphorus deficiency inhibited root growth.
- Taxon
- Lespedeza bicolor Turcz.Lespedeza bicolort0
- Treatment
- severe phosphorus deficiencye0
- Outcome
- root growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under severe phosphorus deficiency or excess, root growth was inhibited because of weakened metabolism or phosphorus toxicity”
t0“Lespedeza bicolor turcz.”
Claim · model-written summary
excess inhibited root growth.
- Taxon
- Lespedeza bicolor Turcz.Lespedeza bicolort0
- Treatment
- excesse0
- Outcome
- root growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under severe phosphorus deficiency or excess, root growth was inhibited because of weakened metabolism or phosphorus toxicity”
t0“Lespedeza bicolor turcz.”
Claim · model-written summary
Root tensile strength correlated positively with cellulose content.
- Taxon
- Lespedeza bicolor Turcz.Lespedeza bicolort0
- Compound
- cellulose contente0
- Outcome
- Root tensile strengthe0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root tensile strength correlated positively with cellulose content but negatively with lignin content”
t0“Lespedeza bicolor turcz.”
Claim · model-written summary
Root tensile strength correlated negatively with lignin content.
- Taxon
- Lespedeza bicolor Turcz.Lespedeza bicolort0
- Compound
- lignin contente0
- Outcome
- Root tensile strengthe0
- Direction
- negativelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root tensile strength correlated positively with cellulose content but negatively with lignin content”
t0“Lespedeza bicolor turcz.”
Claim · model-written summary
fine root proportion was greatest at 2 g m –2 yr –1 phosphorus.
- Taxon
- L. bicolorLespedeza bicolore0
- Treatment
- 2 g m –2 yr –1e0
- Outcome
- fine root proportione0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. bicolor grown at the phosphorus supply level of 2 g m –2 yr –1 displayed optimal growth performance and erosion-reducing potential, with the greatest root biomass, fine root proportion, and tensile strength”
Claim · model-written summary
tensile strength was greatest at 2 g m –2 yr –1 phosphorus.
- Taxon
- L. bicolorLespedeza bicolore0
- Treatment
- 2 g m –2 yr –1e0
- Outcome
- tensile strengthe0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. bicolor grown at the phosphorus supply level of 2 g m –2 yr –1 displayed optimal growth performance and erosion-reducing potential, with the greatest root biomass, fine root proportion, and tensile strength”
Claim · model-written summary
The 2 g m –2 yr –1 treatment showed optimal erosion-reducing potential.
- Taxon
- L. bicolorLespedeza bicolore0
- Treatment
- 2 g m –2 yr –1e0
- Outcome
- erosion-reducing potentiale0
- Direction
- optimale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. bicolor grown at the phosphorus supply level of 2 g m –2 yr –1 displayed optimal growth performance and erosion-reducing potential, with the greatest root biomass, fine root proportion, and tensile strength”
The same questions in other papers
phosphorus · growth · Lespedeza bicolor (shrubby lespedeza)Results agree
1 paper in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.