Arid
DOI10.1111/1365-2745.12647
Testing the apparent resistance of three dominant plants to chronic drought on the Colorado Plateau
Hoover, David L.; Duniway, Michael C.; Belnap, Jayne
通讯作者Hoover, David L.
来源期刊JOURNAL OF ECOLOGY
ISSN0022-0477
EISSN1365-2745
出版年2017
卷号105期号:1页码:152-162
英文摘要

1. Many drylands, including the south-western United States, are projected to become more waterlimited as these regions become warmer and drier with climate change. Such chronic drought may push individual species or plant functional types beyond key thresholds leading to reduced growth or even mortality. Indeed, recent observational and experimental evidence from the Colorado Plateau suggests that C3 grasses are the most vulnerable to chronic drought, while C-4 grasses and C-3 shrubs appear to have greater resistance.


2. The effects of chronic, or press-drought are predicted to begin at the physiological level and translate up to higher hierarchical levels. To date, the drought resistance of C-4 grasses and C-3 shrubs in this region has been only evaluated at the community level and thus we lack information on whether there are sensitivities to drought at lower hierarchical levels. In this study, we tested the apparent drought resistance of three dominant species (Pleuraphis jamesii, a C-4 rhizomatous grass; Coleogyne ramosissima, a C-3 drought-deciduous shrub; and Ephedra viridis, a C-3 evergreen shrub) to an ongoing experimental press-drought (-35% precipitation) by comparing individual-level responses (ecophysiology and growth dynamics) to community-level responses (plant cover).


3. For all three species, we observed consistent responses across all hierarchical levels: P. jamesii was sensitive to drought across all measured variables, while the shrubs C. ramosissima and E. viridis had little to no responses to the experimental press-drought at any given level.


4. Synthesis. Our findings suggest that the apparent drought resistance at higher hierarchical levels, such as cover, may serve as good proxies for lower-level responses. Furthermore, it appears the shrubs are avoiding drought, possibly by utilizing moisture at deeper soil layers, while the grasses are limited to shallower layers and must endure the drought conditions. Give this differential sensitivity to drought, a future with less precipitation and higher temperatures may increase the dominance of shrubs on the Colorado Plateau, as grasses succumb to chronic water stress.


英文关键词cold desert dryland ecophysiology Hierarchical Response Framework normalized difference vegetation index photosynthesis plant functional types press soil moisture dynamics
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000390331000015
WOS关键词CARBON-ISOTOPE DISCRIMINATION ; COLD DESERT COMMUNITY ; HYDRAULIC REDISTRIBUTION ; TRADE-OFFS ; SOIL-WATER ; PRECIPITATION ; ECOSYSTEMS ; VEGETATION ; EFFICIENCY ; RESPONSES
WOS类目Plant Sciences ; Ecology
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200320
作者单位US Geol Survey, Southwest Biol Sci Ctr, 2290 Southwest Resource Blvd, Moab, UT 84532 USA
推荐引用方式
GB/T 7714
Hoover, David L.,Duniway, Michael C.,Belnap, Jayne. Testing the apparent resistance of three dominant plants to chronic drought on the Colorado Plateau[J]. United States Geological Survey,2017,105(1):152-162.
APA Hoover, David L.,Duniway, Michael C.,&Belnap, Jayne.(2017).Testing the apparent resistance of three dominant plants to chronic drought on the Colorado Plateau.JOURNAL OF ECOLOGY,105(1),152-162.
MLA Hoover, David L.,et al."Testing the apparent resistance of three dominant plants to chronic drought on the Colorado Plateau".JOURNAL OF ECOLOGY 105.1(2017):152-162.
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