干旱区生态环境知识资源中心(Arid): Slope and Aspect Effects on Seedbed Microclimate and Germination Timing of Fall-Planted Seeds

Arid

DOI	10.1016/j.rama.2020.12.003
	Slope and Aspect Effects on Seedbed Microclimate and Germination Timing of Fall-Planted Seeds
	Boehm, Alex R.; Hardegree, Stuart P.; Glenn, Nancy F.; Reeves, Patrick A.; Moffet, Corey A.; Flerchinger, Gerald N.
通讯作者	Hardegree, SP (corresponding author), USDA ARS, Natl Lab Genet Resources Preservat, 1111 S Mason St, Ft Collins, CO 80521 USA.
来源期刊	RANGELAND ECOLOGY & MANAGEMENT
ISSN	1550-7424
EISSN	1551-5028
出版年	2021
卷号	75 期号:1 页码:58-67
英文摘要	Rangeland vegetation in the Great Basin, United States, is frequently disturbed by natural- and human-caused wildfires that facilitate the establishment and dominance of introduced annual weeds such as cheatgrass (Bromus tectorum) and medusahead wildrye (Taeniatherum caput-medusae [L.] Nevski). Ecological resilience and resistance of native and seeded-non-native plant communities in this region, however, appear to follow topographic patterns associated with slope, aspect, and elevation. Currently, resistance and resilience concepts are being used to prioritize rangeland restoration efforts based on soil-climate classification. We hypothesized that probabilistic patterns of shorter-term weather effects on seedbed microclimate might also be correlated with these perceived spatial patterns of resistance and resilience over space. We used a 39-yr gridded weather dataset to estimate seedbed temperature and water potential at seeding depth as a function of slope and aspect using the Simultaneous Heat and Water (SHAW) model. Seedbed temperature and water potential were then used as input to hydrothermal germination response models to generate indices of seedbed favorability for initial germination and emergence and to estimate cumulative germination response as a function of topography and planting date for the very-fast-germinating cheatgrass, fast-germinating bottlebrush squirreltail (Elymus elymoides [Raf] Swezey), and slower-germinating Idaho fescue (Festuca idahoensis Elmer). Topographic mapping of seedbed favorability showed distinct seasonal patterns associated with both slope and aspect. Southern exposures are likely to facilitate both prewinter germination for early-fall-planted seeds and relatively more midwinter germination for seeds planted later in the fall, but these exposures are also less subject to midwinter frost effects. Northern exposures were likely to delay germination into later winter and early spring and thus avoid potential exposure to a higher probability of winter frost mortality. Microclimatic simulations of this type may provide new metrics for improving our understanding of the mechanistic causes of observed patterns of ecological resistance and resilience over space. Published by Elsevier Inc. on behalf of The Society for Range Management.
英文关键词	Adaptive management Rehabilitation Resilience Resistance Restoration Seedbed microclimate Weather
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000626277100008
WOS关键词	CHEATGRASS BROMUS-TECTORUM ; RESIDUE-SOIL SYSTEM ; GREAT-BASIN ; SAGEBRUSH-STEPPE ; SIMULTANEOUS HEAT ; TEMPORAL VARIABILITY ; PERENNIAL BUNCHGRASS ; DESERT SHRUBLANDS ; WATER MODEL ; GRASS
WOS类目	Ecology ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351467
作者单位	[Boehm, Alex R.; Hardegree, Stuart P.; Flerchinger, Gerald N.] USDA ARS, Northwest Watershed Res Ctr, Boise, ID 83702 USA; [Glenn, Nancy F.] Boise State Univ, Dept Geosci, Boise, ID 83725 USA; [Reeves, Patrick A.] USDA ARS, Natl Lab Genet Resources Preservat, 1111 S Mason St, Ft Collins, CO 80521 USA; [Moffet, Corey A.] USDA ARS, Rangeland & Pasture Res Unit, Woodward, OK 73801 USA
推荐引用方式 GB/T 7714	Boehm, Alex R.,Hardegree, Stuart P.,Glenn, Nancy F.,et al. Slope and Aspect Effects on Seedbed Microclimate and Germination Timing of Fall-Planted Seeds[J],2021,75(1):58-67.
APA	Boehm, Alex R.,Hardegree, Stuart P.,Glenn, Nancy F.,Reeves, Patrick A.,Moffet, Corey A.,&Flerchinger, Gerald N..(2021).Slope and Aspect Effects on Seedbed Microclimate and Germination Timing of Fall-Planted Seeds.RANGELAND ECOLOGY & MANAGEMENT,75(1),58-67.
MLA	Boehm, Alex R.,et al."Slope and Aspect Effects on Seedbed Microclimate and Germination Timing of Fall-Planted Seeds".RANGELAND ECOLOGY & MANAGEMENT 75.1(2021):58-67.