干旱区生态环境知识资源中心(Arid): Carbon and water fluxes in two adjacent Australian semi-arid ecosystems

Arid

DOI	10.1016/j.agrformet.2019.107853
	Carbon and water fluxes in two adjacent Australian semi-arid ecosystems
	Tarin, Tonantzin 1,4; Nolan, Rachael H.1,2; Eamus, Derek 1; Cleverly, James 1,3
通讯作者	Tarin, Tonantzin
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2020
卷号	281
英文摘要	The southern hemisphere and especially Australian arid and semi-arid ecosystems played a significant role in the 2011 global land carbon sink anomaly. Arid and semi-arid regions occupy 70% of the Australian land surface, dominated by two biomes: Mulga woodlands and spinifex grasslands or savannas. We monitored carbon and water fluxes in two of these characteristic ecosystems: a Mulga woodland (2010-2017) and a Corymbia savanna dominated by spinifex grasses (2012-2017). The aims of this study were to compare net ecosystem productivity (NEP) and evapotranspiration (ET) of these two ecosystems and to identify precipitation thresholds at which these ecosystems switched from being a C source to a C sink. Annual NEP in the Mulga woodland ranged from -47 to 217 gC m(-2) y(-1) (2010-2017), with the second largest positive NEP observed during the global C sink anomaly (162 gC m(-2) y(-1), 2010-2011). By contrast in the Corymbia savanna, annual NEP ranged from -190 to 115 gC m(-2) y(-1), with frequent occurrences of negative NEP and larger ET rates than for the Mulga woodland. Precipitation thresholds were identified at 262 mm y(-1) and 507 mm y(-1) in the Mulga woodland and the Corymbia savanna, respectively. Soil water content (SWC), along with air temperature and vapour pressure deficit, was a significant driver for water fluxes in both ecosystems (SWC-ET correlation of 0.5-0.56) and for carbon fluxes in the woodland (SWC-NEP and SWC-GPP correlation of -0.51 and -0.41, respectively). Arid and semi-arid ecosystems have dominated the inter-annual variability of the global terrestrial C sink, thus identifying precipitation thresholds at which ecosystems switch from being a C source to a C sink is important for furthering our understanding of the global C and water budget and for modelling of future climate.
英文关键词	Mulga woodland Savanna Acacia Net ecosystem productivity Rainfall Eddy covariance
类型	Article
语种	英语
国家	Australia ; USA
收录类别	SCI-E
WOS记录号	WOS:000525808600031
WOS关键词	MULGA ACACIA-ANEURA ; TI-TREE BASIN ; PRECIPITATION VARIABILITY ; TEMPORAL DYNAMICS ; SOIL RESPIRATION ; CLIMATE EXTREMES ; CYCLE CONCEPTS ; DOMINANT ROLE ; F-MUELL ; VEGETATION
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/2XILL650/313921
作者单位	1.Univ Technol Sydney, Sch Life Sci, Terr Ecohydrol Res Grp, Sydney, NSW, Australia; 2.Western Sydney Univ, Hawkesbury Inst Environm, Penrith, NSW 2751, Australia; 3.Univ Technol, TERN, Sydney, NSW 2007, Australia; 4.Univ Delaware, Dept Soil & Plant Sci, Delaware, OH 19716 USA
推荐引用方式 GB/T 7714	Tarin, Tonantzin,Nolan, Rachael H.,Eamus, Derek,et al. Carbon and water fluxes in two adjacent Australian semi-arid ecosystems[J],2020,281.
APA	Tarin, Tonantzin,Nolan, Rachael H.,Eamus, Derek,&Cleverly, James.(2020).Carbon and water fluxes in two adjacent Australian semi-arid ecosystems.AGRICULTURAL AND FOREST METEOROLOGY,281.
MLA	Tarin, Tonantzin,et al."Carbon and water fluxes in two adjacent Australian semi-arid ecosystems".AGRICULTURAL AND FOREST METEOROLOGY 281(2020).