Arid
DOI10.1029/2010JG001348
Carbon dioxide exchange in a semidesert grassland through drought-induced vegetation change
Scott, Russell L.1; Hamerlynck, Erik P.1; Jenerette, G. Darrel3; Moran, M. Susan1; Barron-Gafford, Greg A.2
通讯作者Scott, Russell L.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
EISSN2169-8961
出版年2010
卷号115
英文摘要

Global warming may intensify the hydrological cycle and lead to increased drought severity and duration, which could alter plant community structure and subsequent ecosystem water and carbon dioxide cycling. We report on the net ecosystem exchange of carbon dioxide (NEE) of a semidesert grassland through a severe drought which drove succession from native bunchgrasses to forbs and to eventual dominance by an exotic bunchgrass. We monitored NEE and energy fluxes using eddy covariance coupled with meteorological and soil moisture variables for 6 years at a grassland site in southeastern Arizona, USA. Seasonal NEE typically showed a springtime carbon uptake after winter-spring periods of average rainfall followed by much stronger sink activity during the summer rainy season. The two severe drought years (2004 and 2005) resulted in a net release of carbon dioxide (25 g C m(-2)) and widespread mortality of native perennial bunchgrasses. Above average summer rains in 2006 alleviated drought conditions, resulting in a large flush of broad-leaved forbs and negative total NEE (-55 g C m(-2) year(-1)). Starting in 2007 and continuing through 2009, the ecosystem became increasingly dominated by the exotic grass, Eragrostis lehmanniana, and was a net carbon sink (-47 to -98 g C m(-2) year(-1)) but with distinct annual patterns in NEE. Rainfall mediated by soils was the key driver to water and carbon fluxes. Seasonal respiration and photosynthesis were strongly dependent on precipitation, but photosynthesis was more sensitive to rainfall variation. Respiration normalized by evapotranspiration showed no interannual variation, while normalized gross ecosystem production (i.e., water use efficiency) was low during drought years and then increased as the rains returned and the E. lehmanniana invasion progressed. Thus, when dry summer conditions returned in 2009, the potential for ecosystem carbon accumulation was increased and the ecosystem remained a net sink unlike similar dry years when native grasses dominated ecosystem structure.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000282322500001
WOS关键词NET ECOSYSTEM EXCHANGE ; INTRODUCED LEHMANN LOVEGRASS ; WOODY-PLANT ENCROACHMENT ; SEMIARID GRASSLAND ; SEASONAL-VARIATION ; NONNATIVE GRASSES ; EDDY-COVARIANCE ; ERAGROSTIS-LEHMANNIANA ; DESERT GRASSLAND ; GAS-EXCHANGE
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
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/2XILL650/165245
作者单位1.USDA ARS, SE Watershed Res Ctr, Tucson, AZ 85719 USA;
2.Univ Arizona, Tucson, AZ 85721 USA;
3.Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA
推荐引用方式
GB/T 7714
Scott, Russell L.,Hamerlynck, Erik P.,Jenerette, G. Darrel,et al. Carbon dioxide exchange in a semidesert grassland through drought-induced vegetation change[J]. University of Arizona,2010,115.
APA Scott, Russell L.,Hamerlynck, Erik P.,Jenerette, G. Darrel,Moran, M. Susan,&Barron-Gafford, Greg A..(2010).Carbon dioxide exchange in a semidesert grassland through drought-induced vegetation change.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,115.
MLA Scott, Russell L.,et al."Carbon dioxide exchange in a semidesert grassland through drought-induced vegetation change".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 115(2010).
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