| Stuart P. Hardegree, Steven S. Van Vactor, Frederick B. Pierson and Debra E. Palmquist |
| Authors are plant physiologist, hydrologist, and hydrologist, USDA-ARS, Northwest Watershed Research Center, 800 Park Blvd., Plaza IV, Suite 105, Boise, Ida. 83712 and mathematician, USDA-ARS, Landscape Ecology of Rangelands Research Unit, 920 Valley Rd., Reno, Nev. 89512. |
Abstract |
| The objective of many laboratory-germination experiments is to develop insight into the process of field establishment. It is relatively difficult, however, to infer potential field response from laboratory data given the enormous spatial and temporal variability in seedbed microclimate. Previous studies have attempted to survey large numbers of alternating day/night temperature regimes in order to estimate germination response to potential conditions of field microclimate. The objectives of this study were to estimate the errors associated with prediction of variable-temperature germination response from fewer, constant-temperature germination data. Non-dormant seeds of thickspike wheatgrass [Elymus lanceolatus (Scribn. and J.G. Smith) Gould], bluebunch wheatgrass [Pseudoroegneria spicata (Pursh) Löve], Sandberg bluegrass (Poa sandbergii Vasey), and bottlebrush squirreltail [Elymus elymoides (Raf.) Swezey] were germinated under constant, alternating-constant and sine-wave temperature regimes. Predicted and measured cumulative-germination response generally coincided to within a day for most temperature treatments except for the most slowly germinating subpopulations of seeds. Thermal response models can be parameterized from relatively few experimental data but provide predictive inferences relevant to a wide number of variable-temperature conditions. |
| Key Words: seed, model, rate |