Abstract
Wood fiber substrates are widely used as peat substitutes in horticulture, but the impact of their high carbon-to-nitrogen ratio on nitrogen immobilization and crop photosynthetic performance remains unclear. This study systematically examined the effects of wood fiber substrates on lettuce photosynthetic performance and underlying physiological mechanisms using pot experiments. Two substrate treatments—peat (control) and wood fiber—were combined with three nitrogen levels: low, medium, and high (63, 127, and 210 mg N·L−1). Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%). Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways. At the early stage (15 days), key effects included structural damage to the donor side of PSII(Photosystem II), indicated by L and K peaks, and inhibited electron transfer on the PSI(Photosystem I) acceptor side (δRo decreased by 15.08–27.90%, along with a reduction in WOI amplitude). The findings provide an important theoretical basis for optimising nitrogen management strategies for wood fibre substrates.
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Claims 9
Claim · model-written summary
Wood fiber substrates significantly reduced the availability of fast-acting nitrogen relative to peat in lettuce.
- Taxon
- lettuce
Lactuca sativae1 - Treatment
- wood fiber substratese1
- Outcome
- availability of fast-acting nitrogene1
- Direction
- reducede1
- Comparator
- peat (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two substrate treatments—peat (control) and wood fiber—were combined with three nitrogen levels”
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
Claim · model-written summary
Wood fiber substrates decreased lettuce biomass by 39.0–56.8% relative to peat.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese1
- Outcome
- biomasse1
- Direction
- decreasee1
- Value
- 39.0–56.8%e1
- Comparator
- peat (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two substrate treatments—peat (control) and wood fiber—were combined with three nitrogen levels”
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
Claim · model-written summary
Wood fiber substrates decreased total nitrogen content of lettuce by 7.2–39.9% relative to peat.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese1
- Outcome
- total nitrogen contente1
- Direction
- decreasee1
- Value
- 7.2–39.9%e1
- Comparator
- peat (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two substrate treatments—peat (control) and wood fiber—were combined with three nitrogen levels”
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
Claim · model-written summary
Wood fiber substrates decreased chlorophyll content of lettuce by 13.7–36.2% relative to peat.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese1
- Outcome
- chlorophyll contente1
- Direction
- decreasee1
- Value
- 13.7–36.2%e1
- Comparator
- peat (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two substrate treatments—peat (control) and wood fiber—were combined with three nitrogen levels”
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
Claim · model-written summary
Wood fiber substrates impair photosystem function in lettuce.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese2
- Outcome
- photosystem functione2
- Direction
- impaire2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
e2“Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways”
Claim · model-written summary
Wood fiber substrates cause structural damage to the donor side of PSII in lettuce at the early stage.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese2
- Outcome
- structural damage to the donor side of PSIIe3
- Qualifier
- At the early stage (15 days)e3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
e2“Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways”
e3“At the early stage (15 days), key effects included structural damage to the donor side of PSII(Photosystem II), indicated by L and K peaks, and inhibited electron transfer on the PSI(Photosystem I) acceptor side (δRo decreased by 15.08–27.90%, along with a reduction in WOI amplitude)”
Claim · model-written summary
Wood fiber substrates inhibit electron transfer on the PSI acceptor side in lettuce.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese2
- Outcome
- electron transfer on the PSI(Photosystem I) acceptor sidee3
- Direction
- inhibitede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
e2“Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways”
e3“At the early stage (15 days), key effects included structural damage to the donor side of PSII(Photosystem II), indicated by L and K peaks, and inhibited electron transfer on the PSI(Photosystem I) acceptor side (δRo decreased by 15.08–27.90%, along with a reduction in WOI amplitude)”
Claim · model-written summary
Wood fiber substrates decreased δRo by 15.08–27.90% in lettuce.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese2
- Outcome
- δRoe3
- Direction
- decreasede3
- Value
- 15.08–27.90%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
e2“Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways”
e3“At the early stage (15 days), key effects included structural damage to the donor side of PSII(Photosystem II), indicated by L and K peaks, and inhibited electron transfer on the PSI(Photosystem I) acceptor side (δRo decreased by 15.08–27.90%, along with a reduction in WOI amplitude)”
Claim · model-written summary
Wood fiber substrates reduce WOI amplitude in lettuce.
- Taxon
- lettuceLactuca sativae1
- Treatment
- wood fiber substratese2
- Outcome
- WOI amplitudee3
- Direction
- reductione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results indicated that wood fiber substrates significantly reduced the availability of fast-acting nitrogen, leading to a substantial decrease in lettuce biomass (39.0–56.8%), total nitrogen content (7.2–39.9%), and chlorophyll content (13.7–36.2%)”
e2“Chlorophyll fluorescence kinetics analysis revealed that wood fiber substrates impair photosystem function through multiple pathways”
e3“At the early stage (15 days), key effects included structural damage to the donor side of PSII(Photosystem II), indicated by L and K peaks, and inhibited electron transfer on the PSI(Photosystem I) acceptor side (δRo decreased by 15.08–27.90%, along with a reduction in WOI amplitude)”
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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.