Abstract
Field studies were conducted in 2 types of grasslands in the Pryor Mountain Wild Horse Range of northern Wyoming and southern Montana to examine plant biomass production and nitrogen responses to the separate and combined effects of graminoid defoliation and increased environmental resource (water or nutrients) supply. Short-term plant responses were monitored over 2 years which differed substantially in growing season precipitation. In the arid, low elevation grassland, total grass biomass was significantly lower in the dry year than the wet year in all treatments. Defoliation of the grasses did not reduce their aboveground biomass production in the wet year, but severely reduced it in the dry year, primarily because of a decrease in tiller density. Mass of remaining individual tillers increased with clipping in the dry year, and nitrogen concentrations of the grasses increased with clipping in both years. Irrigation alone increased total belowground biomass compared to the other treatments, but did not increase the aboveground biomass production of any plant functional group. Clipping plus irrigation resulted in greater total aboveground biomass production and higher nitrogen concentrations of the grasses than control or irrigated treatments. Clipping graminoids in the more mesic montane grassland did not decrease their biomass production in either year, but did increase their nitrogen concentrations and increase the collective aboveground biomass production of the other plant functional groups. Fertilization and fertilization plus clipping significantly increased total aboveground biomass production in both years, and total belowground biomass was greatest in fertilized plots.
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Claims 16
Claim · model-written summary
Grass biomass was lower in the dry year than the wet year.
Verbatim
e0“In the arid, low elevation grassland, total grass biomass was significantly lower in the dry year than the wet year in all treatments.”
Claim · model-written summary
Defoliation was associated with did not reduce aboveground biomass production.
- Taxon
- grassese0
- Treatment
- Defoliatione0
- Outcome
- aboveground biomass productione0
- Direction
- did not reducee0
Not reportedComparator
Verbatim
e0“Defoliation of the grasses did not reduce their aboveground biomass production in the wet year, but severely reduced it in the dry year, primarily because of a decrease in tiller density.”
Claim · model-written summary
Defoliation was associated with severely reduced aboveground biomass production.
- Taxon
- grassese0
- Treatment
- Defoliatione0
- Outcome
- aboveground biomass productione0
- Direction
- severely reducede0
Not reportedComparator
Verbatim
e0“Defoliation of the grasses did not reduce their aboveground biomass production in the wet year, but severely reduced it in the dry year, primarily because of a decrease in tiller density.”
Claim · model-written summary
Defoliation was associated with decrease tiller density.
Not reportedComparator
Verbatim
e0“Defoliation of the grasses did not reduce their aboveground biomass production in the wet year, but severely reduced it in the dry year, primarily because of a decrease in tiller density.”
Claim · model-written summary
clipping was associated with increased Mass of remaining individual tillers.
Not reportedComparator
Verbatim
e0“Mass of remaining individual tillers increased with clipping in the dry year, and nitrogen concentrations of the grasses increased with clipping in both years.”
Claim · model-written summary
clipping was associated with increased nitrogen concentrations of the grasses.
- Taxon
- grassese0
- Treatment
- clippinge0
- Outcome
- nitrogen concentrations of the grassese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Mass of remaining individual tillers increased with clipping in the dry year, and nitrogen concentrations of the grasses increased with clipping in both years.”
Claim · model-written summary
Irrigation was associated with increased total belowground biomass.
Verbatim
e0“Irrigation alone increased total belowground biomass compared to the other treatments, but did not increase the aboveground biomass production of any plant functional group.”
t0“Plant Responses to Defoliation and Resource Supplementation in the Pryor Mountains”
Claim · model-written summary
Irrigation was associated with did not increase aboveground biomass production.
Not reportedComparator
Verbatim
e0“Irrigation alone increased total belowground biomass compared to the other treatments, but did not increase the aboveground biomass production of any plant functional group.”
t0“Plant Responses to Defoliation and Resource Supplementation in the Pryor Mountains”
Claim · model-written summary
Clipping plus irrigation was associated with greater total aboveground biomass production.
Verbatim
e0“Clipping plus irrigation resulted in greater total aboveground biomass production and higher nitrogen concentrations of the grasses than control or irrigated treatments.”
Claim · model-written summary
Clipping plus irrigation was associated with higher nitrogen concentrations of the grasses.
Verbatim
e0“Clipping plus irrigation resulted in greater total aboveground biomass production and higher nitrogen concentrations of the grasses than control or irrigated treatments.”
Claim · model-written summary
Clipping was associated with did not decrease biomass production.
Not reportedComparator
Verbatim
e0“Clipping graminoids in the more mesic montane grassland did not decrease their biomass production in either year, but did increase their nitrogen concentrations and increase the collective aboveground biomass production of the other plant functional groups.”
Claim · model-written summary
Clipping was associated with increase nitrogen concentrations.
Not reportedComparator
Verbatim
e0“Clipping graminoids in the more mesic montane grassland did not decrease their biomass production in either year, but did increase their nitrogen concentrations and increase the collective aboveground biomass production of the other plant functional groups.”
Claim · model-written summary
Clipping was associated with increase collective aboveground biomass production of the other plant functional groups.
- Taxon
- graminoidse0
- Treatment
- Clippinge0
- Outcome
- collective aboveground biomass production of the other plant functional groupse0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“Clipping graminoids in the more mesic montane grassland did not decrease their biomass production in either year, but did increase their nitrogen concentrations and increase the collective aboveground biomass production of the other plant functional groups.”
Claim · model-written summary
Fertilization was associated with increased total aboveground biomass production.
- Taxon
- Plantt0
- Treatment
- Fertilizatione0
- Outcome
- total aboveground biomass productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Fertilization and fertilization plus clipping significantly increased total aboveground biomass production in both years, and total belowground biomass was greatest in fertilized plots.”
t0“Plant Responses to Defoliation and Resource Supplementation in the Pryor Mountains”
Claim · model-written summary
fertilization plus clipping was associated with increased total aboveground biomass production.
- Taxon
- Plantt0
- Treatment
- fertilization plus clippinge0
- Outcome
- total aboveground biomass productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Fertilization and fertilization plus clipping significantly increased total aboveground biomass production in both years, and total belowground biomass was greatest in fertilized plots.”
t0“Plant Responses to Defoliation and Resource Supplementation in the Pryor Mountains”
Claim · model-written summary
fertilized plots was associated with greatest total belowground biomass.
Not reportedComparator
Verbatim
e0“Fertilization and fertilization plus clipping significantly increased total aboveground biomass production in both years, and total belowground biomass was greatest in fertilized plots.”
t0“Plant Responses to Defoliation and Resource Supplementation in the Pryor Mountains”