Abstract
Plots of 1st-yr old-field on the New Jersey Piedmont were fumigated with single and repeated 1 ppM SO/sub 2/ stresses. Foliar necrosis resulted; however by late summer living tissue in treated plots equalled control levels. The recovery pattern following stress involved (i) increased growth rates of most species and (ii) restructuring of the plant community species composition. Late season grasses (Setaria spp., Digitaria ssp., etc.) comprise 25.2% of the end-of-season control herbage and as much as 61.4% of the SO/sub 2/ stresses stands. The effect of interval between stresses was significant. A brief (1-day) separation resulted in a greater pulse of damage and higher subsequent growth rates, while more widely spaced stresses (1/2-month) produced greater total damage and more extensive changes in species composition. Photosynthetic potential during the balance of the summer following stress was reduced 17.0% by one fumigation, 23.8% by two stresses over a brief interval, and 31.6% when the perturbations were separated by 1/2 month.
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Claims 14
Claim · model-written summary
Single and repeated sulfur dioxide fumigation resulted in foliar necrosis in plant community plots.
Not reportedComparatorDirection
Verbatim
e0“Plots of 1st-yr old-field on the New Jersey Piedmont were fumigated with single and repeated 1 ppM SO/sub 2/ stresses”
e1“Foliar necrosis resulted”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
By late summer, living tissue in fumigated plots equalled control levels.
Verbatim
e0“Plots of 1st-yr old-field on the New Jersey Piedmont were fumigated with single and repeated 1 ppM SO/sub 2/ stresses”
e1“by late summer living tissue in treated plots equalled control levels”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
Growth rates of most species increased during the recovery following sulfur dioxide stress.
- Taxon
- Plant communityt0
- Treatment
- sulfur dioxide stresst0
- Outcome
- growth rates of most speciese2
- Direction
- increasede2
Not reportedComparator
Verbatim
e2“The recovery pattern following stress involved (i) increased growth rates of most species”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
The recovery after sulfur dioxide stress involved restructuring of the plant community species composition.
Verbatim
e3“restructuring of the plant community species composition”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
Late season grasses comprised 25.2% of the end-of-season control herbage.
Verbatim
e4“Late season grasses (Setaria spp., Digitaria ssp., etc.) comprise 25.2% of the end-of-season control herbage and as much as 61.4% of the SO/sub 2/ stresses stands”
Claim · model-written summary
Late season grasses comprised as much as 61.4% of the stands under sulfur dioxide stresses, compared with control.
- Taxon
- Setaria spp., Digitaria ssp.e4
- Treatment
- SO/sub 2/ stressese4
- Outcome
- standse4
- Value
- 61.4%e4
- Comparator
- controle4
Not reportedDirection
Verbatim
e4“Late season grasses (Setaria spp., Digitaria ssp., etc.) comprise 25.2% of the end-of-season control herbage and as much as 61.4% of the SO/sub 2/ stresses stands”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
The interval between sulfur dioxide stresses had a significant effect on the plant community.
Not reportedDirection
Verbatim
e5“The effect of interval between stresses was significant”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
A brief one-day separation between stresses resulted in a greater pulse of damage.
- Taxon
- Plant communityt0
- Treatment
- A brief (1-day) separatione1
- Outcome
- pulse of damagee1
- Direction
- greatere1
Not reportedComparator
Verbatim
e1“A brief (1-day) separation resulted in a greater pulse of damage”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
A brief one-day separation between stresses resulted in higher subsequent growth rates.
- Taxon
- Plant communityt0
- Treatment
- A brief (1-day) separatione1
- Outcome
- subsequent growth ratese1
- Direction
- highere1
Not reportedComparator
Verbatim
e1“A brief (1-day) separation resulted in a greater pulse of damage and higher subsequent growth rates”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
More widely spaced stresses (1/2-month) produced greater total damage.
- Taxon
- Plant communityt0
- Treatment
- more widely spaced stresses (1/2-month)e1
- Outcome
- total damagee1
- Direction
- greatere1
Not reportedComparator
Verbatim
e1“more widely spaced stresses (1/2-month) produced greater total damage”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
More widely spaced stresses (1/2-month) produced more extensive changes in species composition.
- Taxon
- Plant communityt0
- Treatment
- more widely spaced stresses (1/2-month)e1
- Outcome
- changes in species compositione1
- Direction
- more extensivee1
Not reportedComparator
Verbatim
e1“more widely spaced stresses (1/2-month) produced greater total damage and more extensive changes in species composition”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
Photosynthetic potential in the balance of the summer was reduced by 17.0% by one fumigation.
- Taxon
- Plant communityt0
- Treatment
- one fumigatione1
- Outcome
- Photosynthetic potentiale1
- Direction
- reducede1
- Value
- 17.0%e1
- Qualifier
- during the balance of the summer following stresse1
Not reportedComparator
Verbatim
e1“Photosynthetic potential during the balance of the summer following stress was reduced 17.0% by one fumigation”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
Photosynthetic potential in the balance of the summer was reduced by 23.8% by two stresses over a brief interval.
- Taxon
- Plant communityt0
- Treatment
- two stresses over a brief intervale1
- Outcome
- Photosynthetic potentiale1
- Direction
- reducede1
- Value
- 23.8%e1
- Qualifier
- during the balance of the summer following stresse1
Not reportedComparator
Verbatim
e1“Photosynthetic potential during the balance of the summer following stress was reduced 17.0% by one fumigation, 23.8% by two stresses over a brief interval”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”
Claim · model-written summary
Photosynthetic potential in the balance of the summer was reduced by 31.6% when the perturbations were separated by one-half month.
- Taxon
- Plant communityt0
- Treatment
- perturbations were separated by 1/2 monthe1
- Outcome
- Photosynthetic potentiale1
- Direction
- reducede1
- Value
- 31.6%e1
- Qualifier
- during the balance of the summer following stresse1
Not reportedComparator
Verbatim
e1“Photosynthetic potential during the balance of the summer following stress was reduced 17.0% by one fumigation, 23.8% by two stresses over a brief interval, and 31.6% when the perturbations were separated by 1/2 month”
t0“Plant community repair following sulfur dioxide stress on an old-field ecosystem”