Arid
DOI10.1111/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
ISSN1354-1013
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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