Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/1365-2745.12647 |
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
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ISSN | 0022-0477 |
EISSN | 1365-2745 |
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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