Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1890/07-1177.1 |
SENSITIVITY OF MESQUITE SHRUBLAND CO2 EXCHANGE TO PRECIPITATION IN CONTRASTING LANDSCAPE SETTINGS | |
Potts, Daniel L.1; Scott, Russell L.2; Cable, Jessica M.1,3; Huxman, Travis E.1; Williams, David G.3,4 | |
通讯作者 | Potts, Daniel L. |
来源期刊 | ECOLOGY |
ISSN | 0012-9658 |
出版年 | 2008 |
卷号 | 89期号:10页码:2900-2910 |
英文摘要 | In semiarid ecosystems, physiography (landscape setting) may interact with woody-plant and soil microbe communities to constrain seasonal exchanges of material and energy at the ecosystem scale. In an upland and riparian shrubland, we examined the seasonally dynamic linkage between ecosystem CO2 exchange, woody-plant water status and photosynthesis, and soil respiration responses to summer rainfall. At each site, we compared tower-based measurements of net ecosystem CO2 exchange (NEE) with ecophysiological measurements among velvet mesquite (Prosopis velutina Woot.) in three size classes and soil respiration in sub-canopy and inter-canopy micro-sites. Monsoonal rainfall influenced a greater shift in the magnitude of ecosystem CO2 assimilation in the upland shrubland than in the riparian shrubland. Mesquite water status and photosynthetic gas exchange were closely linked to the onset of the North American monsoon in the upland shrubland. In contrast, the presence of shallow alluvial groundwater in the riparian shrubland caused larger size classes of mesquite to be physiologically insensitive to monsoonal rains. In both shrublands, soil respiration was greatest beneath mesquite canopies and was coupled to shallow soil moisture abundance. Physiography, through its constraint on the physiological sensitivity of deeply rooted woody plants, may interact with plant-mediated rates of soil respiration to affect the sensitivity of semiarid-ecosystem carbon exchange in response to episodic rainfall. |
英文关键词 | eddy covariance flux duration analysis net ecosystem CO2 exchange photosynthesis plant-water relations Prosopis velutina respiration |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000259995100024 |
WOS关键词 | WOODY-PLANT ENCROACHMENT ; CARBON-DIOXIDE EXCHANGE ; MOJAVE DESERT SHRUBS ; SEMIARID GRASSLAND ; WATER-USE ; SEASONAL PRECIPITATION ; CHIHUAHUAN DESERT ; ARID ECOSYSTEMS ; USE EFFICIENCY ; SOIL TEXTURE |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/157096 |
作者单位 | 1.Univ Arizona, Tucson, AZ 85721 USA; 2.ARS, SW Watershed Res Ctr, USDA, Tucson, AZ 85719 USA; 3.Univ Wyoming, Dept Bot, Laramie, WY 82071 USA; 4.Univ Wyoming, Dept Renewable Resources, Laramie, WY 82071 USA |
推荐引用方式 GB/T 7714 | Potts, Daniel L.,Scott, Russell L.,Cable, Jessica M.,et al. SENSITIVITY OF MESQUITE SHRUBLAND CO2 EXCHANGE TO PRECIPITATION IN CONTRASTING LANDSCAPE SETTINGS[J]. University of Arizona,2008,89(10):2900-2910. |
APA | Potts, Daniel L.,Scott, Russell L.,Cable, Jessica M.,Huxman, Travis E.,&Williams, David G..(2008).SENSITIVITY OF MESQUITE SHRUBLAND CO2 EXCHANGE TO PRECIPITATION IN CONTRASTING LANDSCAPE SETTINGS.ECOLOGY,89(10),2900-2910. |
MLA | Potts, Daniel L.,et al."SENSITIVITY OF MESQUITE SHRUBLAND CO2 EXCHANGE TO PRECIPITATION IN CONTRASTING LANDSCAPE SETTINGS".ECOLOGY 89.10(2008):2900-2910. |
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