Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1365-2486.2009.01862.x |
Soil drying and nitrogen availability modulate carbon and water exchange over a range of annual precipitation totals and grassland vegetation types | |
St Clair, Samuel B.1; Sudderth, Erika A.2; Fischer, Marc L.3; Torn, Margaret S.3; Stuart, Stephanie A.2; Salve, Rohit3; Eggett, Dennis L.4; Ackerly, David D.2,3 | |
通讯作者 | St Clair, Samuel B. |
来源期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
出版年 | 2009 |
卷号 | 15期号:12页码:3018-3030 |
英文摘要 | Increased intensity in precipitation events and longer periods of water deficit are predicted as a general trend under future climate scenarios with potentially large effects on terrestrial ecosystem function. The primary objective of this study was to understand how variation in the intensity of precipitation inputs followed by intermittent soil drying events influence leaf and ecosystem carbon dioxide (CO(2)) and water exchange in a California annual grassland mesocosm experiment. We further examined how nitrogen (N) availability, and differences in plant community composition (grass-forb combinations) affected gas exchange responses to the precipitation treatments. Net ecosystem CO(2) exchange (NEE) and evapotranspiration (ET) increased significantly with greater precipitation and were positively correlated with soil moisture. A repeated 10-day soil drying period, following 11 days of watering, strongly depressed NEE over a range of annual precipitation totals (297, 657 and 987 mm), and plant community types. Ecosystem dark respiration (R(e)) and leaf level photosynthesis (A(max)) showed greater sensitivity to periods of soil drying in the low precipitation plots (297 mm). N additions significantly increased NEE and R(e), particularly as water availability was increased. Across the range of precipitation totals and plant community types, intermittent periods of soil moisture deficit and native soil N availability constrained leaf and ecosystem level CO(2) exchange, while the influence on water vapor exchange was less pronounced. |
英文关键词 | climate change drought ecosystem fluxes forbs gas exchange grassland photosynthesis precipitation pulse respiration transpiration |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000271710300017 |
WOS关键词 | NET PRIMARY PRODUCTIVITY ; CHIHUAHUAN DESERT GRASSLAND ; WESTERN UNITED-STATES ; TEMPERATE GRASSLAND ; TERRESTRIAL ECOSYSTEMS ; CO2 FLUXES ; RESPONSES ; DEPOSITION ; CALIFORNIA ; MOISTURE |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/160875 |
作者单位 | 1.Brigham Young Univ, Dept Plant & Wildlife Sci, Provo, UT 84602 USA; 2.Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA; 3.Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA; 4.Brigham Young Univ, Dept Stat, Provo, UT 84602 USA |
推荐引用方式 GB/T 7714 | St Clair, Samuel B.,Sudderth, Erika A.,Fischer, Marc L.,et al. Soil drying and nitrogen availability modulate carbon and water exchange over a range of annual precipitation totals and grassland vegetation types[J],2009,15(12):3018-3030. |
APA | St Clair, Samuel B..,Sudderth, Erika A..,Fischer, Marc L..,Torn, Margaret S..,Stuart, Stephanie A..,...&Ackerly, David D..(2009).Soil drying and nitrogen availability modulate carbon and water exchange over a range of annual precipitation totals and grassland vegetation types.GLOBAL CHANGE BIOLOGY,15(12),3018-3030. |
MLA | St Clair, Samuel B.,et al."Soil drying and nitrogen availability modulate carbon and water exchange over a range of annual precipitation totals and grassland vegetation types".GLOBAL CHANGE BIOLOGY 15.12(2009):3018-3030. |
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