Jack A Morgan
Affiliation: Agricultural Research Service
- C4 grasses prosper as carbon dioxide eliminates desiccation in warmed semi-arid grasslandJack A Morgan
USDA ARS, Rangeland Resources Research Unit and Northern Plains Area, Fort Collins, Colorado 80526, USA
Nature 476:202-5. 2011..The results indicate that in a warmer, CO(2)-enriched world, both SWC and productivity in semi-arid grasslands may be higher than previously expected...
- Carbon dioxide enrichment alters plant community structure and accelerates shrub growth in the shortgrass steppeJack A Morgan
Rangeland Resources Research Unit, Agricultural Research Service, United States Department of Agriculture, Fort Collins, CO 80526, USA
Proc Natl Acad Sci U S A 104:14724-9. 2007....
- Water relations in grassland and desert ecosystems exposed to elevated atmospheric CO2J A Morgan
Rangeland Resources Research Unit, USDA Agricultural Research Service, 1701 Centre Ave, 80526, Fort Collins, CO, USA
Oecologia 140:11-25. 2004..For landscape scale predictions, this analysis calls for a clear distinction between biomass responses due to direct CO2 effects on photosynthesis and those indirect CO2 effects via soil moisture as documented here...
- Elevated CO₂ does not offset greater water stress predicted under climate change for native and exotic riparian plantsLaura G Perry
Department of Biology, Colorado State University, Fort Collins, CO, USA
New Phytol 197:532-43. 2013..Our results suggest that increased aridity will reduce riparian seedling growth despite elevated CO₂, and will reduce growth more for native Salix and Populus than for drought-tolerant exotic species...
- Soil and plant water relations determine photosynthetic responses of C3 and C4 grasses in a semi-arid ecosystem under elevated CO2Daniel R Lecain
USDA ARS Rangeland Resources Research Unit, Crops Research Laboratory, 1701 Centre Avenue, Fort Collins, CO 80526, USA
Ann Bot 92:41-52. 2003..These results suggest that photosynthetic responses of C3 and C4 grasses in this semi-arid ecosystem will be driven primarily by the effect of elevated CO2 on plant and soil water relations...
- Contrasting effects of elevated CO2 and warming on nitrogen cycling in a semiarid grasslandFeike A Dijkstra
Rangeland Resources Research Unit, USDA ARS, Crops Research Laboratory, 1701 Centre Ave, Fort Collins, CO 80526, USA
New Phytol 187:426-37. 2010..Our results indicate a more closed N cycle under elevated CO(2) and a more open N cycle with warming, which could affect long-term N retention, plant productivity, and C sequestration in this semiarid grassland...
- Wetting and drying cycles drive variations in the stable carbon isotope ratio of respired carbon dioxide in semi-arid grasslandJee H Shim
Department of Forest, Rangeland, and Watershed Stewardship, Colorado State University, Fort Collins, CO 80523, USA
Oecologia 160:321-33. 2009..Stable isotopic composition of respiration in semi-arid ecosystems is more temporally and spatially variable than in mesic ecosystems owing to dynamic aspects of pulse precipitation episodes and biological drivers...
- Response of organic and inorganic carbon and nitrogen to long-term grazing of the shortgrass steppeJean D Reeder
Rangeland Resources Research Unit, USDA ARS, 1701 Centre Avenue, Fort Collins, Colorado 80526, USA
Environ Manage 33:485-95. 2004..These results emphasize the importance in semiarid and arid ecosystems of including inorganic C in assessments of the mass and distribution of plant-soil C and in evaluations of the impacts of grazing management on C sequestration...
- Rhizosphere interactions, carbon allocation, and nitrogen acquisition of two perennial North American grasses in response to defoliation and elevated atmospheric CO2David J Augustine
Agricultural Research Service, Rangeland Resources Research Unit, USDA, 1701 Centre Ave, Fort Collins, CO 80526, USA
Oecologia 165:755-70. 2011....
- UV radiation effects on plant growth and forage quality in a shortgrass steppe ecosystemsDaniel G Milchunas
Forest, Range, and Watershed Stewardship Department, Colorado State University, Fort Collins, CO 80523, USA
Photochem Photobiol 79:404-10. 2004..Grazing treatment had large positive effects on current-year productivity only in the wet year and some small positive effects on quality in both wet and dry years. Interactions between UV and grazing treatment were not observed...
- Projected ecosystem impact of the Prairie Heating and CO2 Enrichment experimentWilliam J Parton
Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523 1499, USA
New Phytol 174:823-34. 2007..Model results are consistent with empirical field data suggesting that water and nitrogen will be critical drivers of the semiarid grassland response to global change...
- Ecology. Looking beneath the surfaceJack A Morgan
USDA ARS Rangeland Resources Research Unit, 1701 Centre Avenue, Fort Collins, CO 80526, USA
Science 298:1903-4. 2002
- Invasive forb benefits from water savings by native plants and carbon fertilization under elevated CO2 and warmingDana M Blumenthal
USDA ARS, Rangeland Resources Research Unit, 1701 Centre Avenue, Fort Collins, CO, 80526, USA
New Phytol 200:1156-65. 2013..Water-limited ecosystems may therefore be particularly vulnerable to invasion as CO2 increases...
- Next generation of elevated [CO2] experiments with crops: a critical investment for feeding the future worldElizabeth A Ainsworth
US Department of Agriculture, Agricultural Research Service and Photosynthesis Research Unit, Urbana, IL, USA
Plant Cell Environ 31:1317-24. 2008..This is necessary if we are to realize the potential for yield gains in the future...