Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00442-002-0973-x |
Leaf delta C-13 variability with elevation, slope aspect, and precipitation in the southwest United States | |
Van de Water, PK; Leavitt, SW; Betancourt, JL | |
通讯作者 | Van de Water, PK |
来源期刊 | OECOLOGIA
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ISSN | 0029-8549 |
出版年 | 2002 |
卷号 | 132期号:3页码:332-343 |
英文摘要 | Leaves from several desert and woodland species, including gymnosperms and angiosperms with both C-3 and C-4 physiology, were analyzed to detect trends in delta(13)C(leaf) with elevation and slope aspect along two transects in southeastern Utah and south-central New Mexico, USA. The main difference between the two transects is the steeper elevational gradient for mean annual and summer precipitation in the southern transect. For any given species, we found that isotopic differences between individual plants growing at the same site commonly equal differences measured for plants along the entire altitudinal gradient. In C3 plants, delta(13)C(leaf) values become slightly enriched at the lowest elevations, the opposite of trends identified in more humid regions. Apparently, increasing water-use efficiency with drought stress offsets the influence of other biotic and abiotic factors that operate to decrease isotopic discrimination with elevation. For some species shared by the two transects (e.g., Pinus edulis and Cercocarpus montanus), delta(leaf)(13) values are dramatically depleted at sites that receive more than 550 mm mean annual precipitation, roughly the boundary (pedalfer-pedocal) at which soils commonly fill to field capacity in summer and carbonates are leached. We hypothesize that, in summer-wet areas, this may represent the boundary at which drought stress overtakes other factors in determining the sign of delta(13)C(leaf) with elevation. The opposition of isotopic trends with elevation in and versus humid regions cautions against standard correction for elevation in comparative studies of delta(13)C(leaf). |
英文关键词 | carbon isotope composition elevation slope aspect precipitation C3 and C4 plants |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000177752500002 |
WOS关键词 | CARBON-ISOTOPE DISCRIMINATION ; WATER-USE EFFICIENCY ; ATRIPLEX-CANESCENS CHENOPODIACEAE ; HAWAIIAN METROSIDEROS-POLYMORPHA ; NORTHERN NEW-MEXICO ; CO2 ASSIMILATION ; GAS-EXCHANGE ; RAINFALL GRADIENT ; GREAT-BASIN ; ENVIRONMENTAL-CONDITIONS |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | University of Arizona ; United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/143487 |
作者单位 | (1)Univ Arizona, Tree Ring Res Lab, Tucson, AZ 85721 USA;(2)US Geol Survey, Desert Lab, Tucson, AZ 85745 USA |
推荐引用方式 GB/T 7714 | Van de Water, PK,Leavitt, SW,Betancourt, JL. Leaf delta C-13 variability with elevation, slope aspect, and precipitation in the southwest United States[J]. University of Arizona, United States Geological Survey,2002,132(3):332-343. |
APA | Van de Water, PK,Leavitt, SW,&Betancourt, JL.(2002).Leaf delta C-13 variability with elevation, slope aspect, and precipitation in the southwest United States.OECOLOGIA,132(3),332-343. |
MLA | Van de Water, PK,et al."Leaf delta C-13 variability with elevation, slope aspect, and precipitation in the southwest United States".OECOLOGIA 132.3(2002):332-343. |
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