Abstract
As the constructive species of subalpine forest ecosystems in the Qilian Mountains of northwest China, regeneration of Picea crassifolia (Pinaceae) from seeds plays a crucial role in maintaining forest functionality. We investigated the function of Dasiphora fruticosa (Rosaceae), a dominant shrub species in the Qilian Mountains, as a nurse plant for establishment and growth of P. crassifolia saplings. A comprehensive monitoring program was conducted to assess the effect of D. fruticosa on the establishment and growth of P. crassifolia saplings. Our results indicate that D. fruticosa shrubs positively facilitate the occurrence of P. crassifolia saplings. The linear mixed-effects model showed that P. crassifolia saplings had a significantly higher growth rate inside the D. fruticosa shrub canopy than outside, and D. fruticosa shrubs did not significantly affect the mortality percentage of P. crassifolia saplings. The height of dead P. crassifolia saplings was significantly lower than that of the surrounding D. fruticosa shrubs, indicating that these saplings died before growing above the shrub canopy. Soil moisture content under D. fruticosa shrubs was significantly higher than that outside the shrubs. In conclusion, D. fruticosa shrubs facilitate seed germination and sapling establishment of P. crassifolia and promote sapling growth, although their shading effect suggests potential competitive pressure on sapling survival as they develop.
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Claims 10
Claim · model-written summary
D. fruticosa shrubs facilitated occurrence of P. crassifolia saplings.
- Taxon
- P. crassifolia
Picea crassifoliae0 - Interactor
- D. fruticosa
Dasiphora fruticosae0other - Outcome
- occurrence of P. crassifolia saplingse0
- Direction
- positively facilitatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicate that D. fruticosa shrubs positively facilitate the occurrence of P. crassifolia saplings.”
Claim · model-written summary
Sapling growth rate was higher inside D. fruticosa canopies than outside.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- growth ratee0
- Direction
- highere0
- Comparator
- outsidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The linear mixed-effects model showed that P. crassifolia saplings had a significantly higher growth rate inside the D. fruticosa shrub canopy than outside, and D. fruticosa shrubs did not significantly affect the mortality percentage of P. crassifolia saplings.”
Claim · model-written summary
D. fruticosa did not significantly affect P. crassifolia sapling mortality percentage.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- mortality percentage of P. crassifolia saplingse0
- Direction
- did not significantly affecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The linear mixed-effects model showed that P. crassifolia saplings had a significantly higher growth rate inside the D. fruticosa shrub canopy than outside, and D. fruticosa shrubs did not significantly affect the mortality percentage of P. crassifolia saplings.”
Claim · model-written summary
Dead P. crassifolia saplings were shorter than surrounding D. fruticosa shrubs.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- height of dead P. crassifolia saplingse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The height of dead P. crassifolia saplings was significantly lower than that of the surrounding D. fruticosa shrubs, indicating that these saplings died before growing above the shrub canopy.”
Claim · model-written summary
The dead saplings likely died before growing above the shrub canopy.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Outcome
- died before growing above the shrub canopye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The height of dead P. crassifolia saplings was significantly lower than that of the surrounding D. fruticosa shrubs, indicating that these saplings died before growing above the shrub canopy.”
Claim · model-written summary
Soil moisture was higher under D. fruticosa shrubs than outside.
- Taxon
- Picea crassifoliaPicea crassifoliat0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- Soil moisture contente0
- Direction
- highere0
- Comparator
- outside the shrubse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil moisture content under D. fruticosa shrubs was significantly higher than that outside the shrubs.”
t0“Picea crassifolia”
Claim · model-written summary
D. fruticosa shrubs facilitate P. crassifolia seed germination.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- seed germinatione0
- Direction
- facilitatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In conclusion, D. fruticosa shrubs facilitate seed germination and sapling establishment of P. crassifolia and promote sapling growth, although their shading effect suggests potential competitive pressure on sapling survival as they develop.”
Claim · model-written summary
D. fruticosa shrubs facilitate P. crassifolia sapling establishment.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- sapling establishmente0
- Direction
- facilitatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In conclusion, D. fruticosa shrubs facilitate seed germination and sapling establishment of P. crassifolia and promote sapling growth, although their shading effect suggests potential competitive pressure on sapling survival as they develop.”
Claim · model-written summary
D. fruticosa shrubs promote P. crassifolia sapling growth.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- sapling growthe0
- Direction
- promotee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In conclusion, D. fruticosa shrubs facilitate seed germination and sapling establishment of P. crassifolia and promote sapling growth, although their shading effect suggests potential competitive pressure on sapling survival as they develop.”
Claim · model-written summary
Shrub shading may create competitive pressure on sapling survival.
- Taxon
- P. crassifoliaPicea crassifoliae0
- Interactor
- D. fruticosaDasiphora fruticosae0other
- Outcome
- potential competitive pressure on sapling survivale0
- Qualifier
- shading effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In conclusion, D. fruticosa shrubs facilitate seed germination and sapling establishment of P. crassifolia and promote sapling growth, although their shading effect suggests potential competitive pressure on sapling survival as they develop.”