干旱区生态环境知识资源中心(Arid): Native shrubland and managed buffelgrass savanna in drylands: Implications for ecosystem carbon and water fluxes

Arid

DOI	10.1016/j.agrformet.2019.01.030
	Native shrubland and managed buffelgrass savanna in drylands: Implications for ecosystem carbon and water fluxes
	Hinojo-Hinojo, Cesar 1; Castellanos, Alejandro E.1; Huxman, Travis 2; Rodriguez, Julio C.3; Vargas, Rodrigo 4; Romo-Leon, Jose R.1; Biederman, Joel A.5
通讯作者	Castellanos, Alejandro E.
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2019
卷号	268 页码:269-278
英文摘要	Land cover and land-use change (LCLUC) between woody- and grass-dominated ecosystems in drylands comprise one of the largest uncertainties in the land CO2 sink. This is especially true for the widespread transition from shrublands to grasslands/savannas caused by the establishment of exotic C-4 grass species for grazing or through biological invasion of these species, where information about its impacts on ecosystem CO2 fluxes is limited. For studying this, we used three years of eddy covariance measurements of net ecosystem production (NEP), gross primary production (GPP), ecosystem respiration (R-eco) and evapotranspiration (ET) over a Sonoran Desert shrubland and an adjacent grazing savanna of buffelgrass (Cenchrus ciliaris L.), established 35 years ago. At monthly, seasonal and annual time scales, we assessed whether between-site differences in CO2 fluxes were related to differences in ecosystem water use, measured as the fraction ET to precipitation, water use efficiency (WUE, i.e. the ratio between GPP and ET) and/or to the relation between R-eco, and GPP. Although the savanna had higher WUE than the shrubland, its summer NEP was limited by water use, due to limitations in leaf area index and likely rooting patterns. Conversely, the savanna had higher NEP than the shrubland during fall to spring due to increased WUE; possibly due to activity of buffelgrass and remaining woody species using (summer) water from deeper soil layers. However, differences across these seasons compensated each other at the inter-annual scale, and both sites had comparable net carbon sinks over the three-year study period. Further studies are needed to understand and reduce the uncertainty associated with carbon and water fluxes associated with LCLUC in dryland ecosystems.
英文关键词	Buffelgrass Cenchrus ciliaris Eddy covariance Land cover change Sonoran Desert Carbon and water fluxes Grass encroachment
类型	Article
语种	英语
国家	Mexico ; USA
收录类别	SCI-E
WOS记录号	WOS:000460844700027
WOS关键词	WOODY-PLANT ENCROACHMENT ; SEMIARID ECOSYSTEMS ; CO2 FLUX ; GRASS ; CONSEQUENCES ; EXCHANGE ; PRODUCTIVITY ; INVASION ; BALANCE ; SONORA
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/213941
作者单位	1.Univ Sonora, Dept Invest Cient & Tecnol, Hermosillo 83000, Sonora, Mexico; 2.Univ Calif Irvine, Ctr Environm Biol, Ecol & Evolutionary Biol, Irvine, CA 92629 USA; 3.Univ Sonora, Dept Agr & Ganaderia, Hermosillo 83000, Sonora, Mexico; 4.Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19716 USA; 5.ARS, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA
推荐引用方式 GB/T 7714	Hinojo-Hinojo, Cesar,Castellanos, Alejandro E.,Huxman, Travis,et al. Native shrubland and managed buffelgrass savanna in drylands: Implications for ecosystem carbon and water fluxes[J],2019,268:269-278.
APA	Hinojo-Hinojo, Cesar.,Castellanos, Alejandro E..,Huxman, Travis.,Rodriguez, Julio C..,Vargas, Rodrigo.,...&Biederman, Joel A..(2019).Native shrubland and managed buffelgrass savanna in drylands: Implications for ecosystem carbon and water fluxes.AGRICULTURAL AND FOREST METEOROLOGY,268,269-278.
MLA	Hinojo-Hinojo, Cesar,et al."Native shrubland and managed buffelgrass savanna in drylands: Implications for ecosystem carbon and water fluxes".AGRICULTURAL AND FOREST METEOROLOGY 268(2019):269-278.