Abstract
Nitrogen use efficiency (NUE), defined as the ratio of biomass growth and the nitrogen (N) taken up from a soil, is widely used in the evaluation of plant N economy. We conducted a fertilization experiment with Quercus serrata seedlings under different soil N and phosphorus (P) levels to determine the influence of high N deposition levels under different P availabilities upon NUE, plus the NUE components N productivity (NP), and mean residence time of N (MRT). The seedlings were grown for one growing season in the potted soil under three N levels (0, 50, and 100 kg N ha-1) combined with two P levels (0 and 50 kg P ha-1). Nitrogen supply to the soil reduced NUE by decreasing NP and MRT, whereas P supply enhanced NUE. Although P supply did not have a significant influence on the reduction of NUE with increasing N levels, it affected the response of the NUE components with increasing N levels. Within leaves, N supply reduced the photosynthetic nitrogen use efficiency (PNUE), P alleviated this reduction. Therefore, P is considered as one of the key factors determining the change of NUE in Q. serrata under the influence of high N supply.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Nitrogen supply reduced seedling nitrogen use efficiency.
- Taxon
- Quercus serrata
Quercus serratat0 - Treatment
- Nitrogen supplye0
- Outcome
- NUEe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen supply to the soil reduced NUE by decreasing NP and MRT”
t0“Quercus serrata seedlings”
Claim · model-written summary
Nitrogen supply decreased nitrogen productivity.
- Taxon
- Quercus serrataQuercus serratat0
- Treatment
- Nitrogen supplye0
- Outcome
- NPe0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen supply to the soil reduced NUE by decreasing NP and MRT”
t0“Quercus serrata seedlings”
Claim · model-written summary
Nitrogen supply decreased mean residence time of nitrogen.
- Taxon
- Quercus serrataQuercus serratat0
- Treatment
- Nitrogen supplye0
- Outcome
- MRTe0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen supply to the soil reduced NUE by decreasing NP and MRT”
t0“Quercus serrata seedlings”
Claim · model-written summary
Phosphorus supply enhanced nitrogen use efficiency.
- Taxon
- Quercus serrataQuercus serratat0
- Treatment
- P supplye0
- Outcome
- NUEe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P supply enhanced NUE”
t0“Quercus serrata seedlings”
Claim · model-written summary
Phosphorus supply did not significantly change the reduction of nitrogen use efficiency with increasing nitrogen.
- Taxon
- Quercus serrataQuercus serratat0
- Treatment
- P supplye0
- Outcome
- reduction of NUEe0
- Direction
- did not have a significant influencee0
- Qualifier
- with increasing N levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P supply did not have a significant influence on the reduction of NUE with increasing N levels”
t0“Quercus serrata seedlings”
Claim · model-written summary
Phosphorus supply affected nitrogen productivity responses to increasing nitrogen.
- Taxon
- Quercus serrataQuercus serratat0
- Treatment
- P supplye2
- Outcome
- N productivitye1
- Qualifier
- with increasing N levelse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it affected the response of the NUE components with increasing N levels”
e1“N productivity (NP), and mean residence time of N (MRT)”
e2“P supply did not have a significant influence”
t0“Quercus serrata seedlings”
Claim · model-written summary
Phosphorus supply affected mean residence time responses to increasing nitrogen.
- Taxon
- Quercus serrataQuercus serratat0
- Treatment
- P supplye2
- Outcome
- mean residence time of Ne1
- Qualifier
- with increasing N levelse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it affected the response of the NUE components with increasing N levels”
e1“mean residence time of N (MRT)”
e2“P supply did not have a significant influence”
t0“Quercus serrata seedlings”
Claim · model-written summary
Nitrogen supply reduced photosynthetic nitrogen use efficiency in leaves.
- Taxon
- Quercus serrataQuercus serratat0
- Organ / stage
- leavese0
- Treatment
- N supplye0
- Outcome
- photosynthetic nitrogen use efficiencye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within leaves, N supply reduced the photosynthetic nitrogen use efficiency (PNUE)”
t0“Quercus serrata seedlings”
Claim · model-written summary
Phosphorus alleviated the nitrogen-induced reduction of photosynthetic nitrogen use efficiency.
- Taxon
- Quercus serrataQuercus serratat0
- Organ / stage
- leavese0
- Treatment
- Pe0
- Outcome
- photosynthetic nitrogen use efficiencye0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within leaves, N supply reduced the photosynthetic nitrogen use efficiency (PNUE), P alleviated this reduction”
t0“Quercus serrata seedlings”