Arid
DOI10.1002/jgrg.20101
Dynamics of component carbon fluxes in a semi-arid Acacia woodland, central Australia
Cleverly, James1; Boulain, Nicolas1; Villalobos-Vega, Randol1; Grant, Nicole1; Faux, Ralph1; Wood, Cameron2; Cook, Peter G.2,3; Yu, Qiang1; Leigh, Andrea1; Eamus, Derek1,4
通讯作者Cleverly, James
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
EISSN2169-8961
出版年2013
卷号118期号:3页码:1168-1185
英文摘要

Vast areas in the interior of Australia are exposed to regular but infrequent periods of heavy rainfall, interspersed with long periods at high temperatures, but little is known of the carbon budget of these remote areas or how they respond to extreme precipitation. In this study, we applied three methods to partition net ecosystem photosynthesis into gross primary production (GPP) and ecosystem respiration (R-e) during two years of contrasting rainfall. The first year was wet (>250 mm above average rainfall), while little precipitation fell during the second year (>100 mm below average). During the first year of study, rates of GPP were large (793 g C m(-2) yr(-1)) in this semi-arid Mulga (Acacia aneura) and grass savanna due to complementary photosynthetic responses by the canopy and C-4 understorey to cycles of heavy rainfall. Patterns in GPP during the summer and autumn matched those in leaf area index (LAI), photosynthetic activity, and autotrophic respiration. During the dry year, small but positive photosynthetic uptake by Mulga contributed to the neutral carbon budget (GPP / R-e=1.060.03). Small rates of photosynthesis by evergreen Mulga when dry were supported by storage of soil moisture above a relatively shallow hardpan. Little soil organic matter (1.1%) was available to support heterotrophic respiration (R-h) without input of fresh substrate. The two largest sources of R-e in this study were autotrophic respiration by the seasonal understorey and R-h through decomposition of fresh organic matter supplied by the senescent understorey.


英文关键词net ecosystem photosynthesis carbon flux partitioning light response curve assimilation ecosystem respiration gross primary production
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000325549900017
WOS关键词ARTIFICIAL NEURAL-NETWORK ; NET ECOSYSTEM EXCHANGE ; LEAF-RESPIRED CO2 ; EDDY-COVARIANCE ; SOIL RESPIRATION ; NORTHERN AUSTRALIA ; TROPICAL SAVANNA ; TEMPERATURE ; DIOXIDE ; WATER
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
来源机构Commonwealth Scientific and Industrial Research Organisation
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/178429
作者单位1.Univ Technol Sydney, Sch Environm, POB 123, Broadway, NSW 2007, Australia;
2.Flinders Univ S Australia, Sch Environm, Natl Ctr Groundwater Res & Training, Adelaide, SA 5001, Australia;
3.Commonwealth Sci & Ind Res Org, Div Land & Water, Water Hlth Country Natl Res Flagship, Adelaide, SA, Australia;
4.Univ Technol Sydney, Natl Ctr Groundwater Res & Training, Broadway, NSW 2007, Australia
推荐引用方式
GB/T 7714
Cleverly, James,Boulain, Nicolas,Villalobos-Vega, Randol,et al. Dynamics of component carbon fluxes in a semi-arid Acacia woodland, central Australia[J]. Commonwealth Scientific and Industrial Research Organisation,2013,118(3):1168-1185.
APA Cleverly, James.,Boulain, Nicolas.,Villalobos-Vega, Randol.,Grant, Nicole.,Faux, Ralph.,...&Eamus, Derek.(2013).Dynamics of component carbon fluxes in a semi-arid Acacia woodland, central Australia.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,118(3),1168-1185.
MLA Cleverly, James,et al."Dynamics of component carbon fluxes in a semi-arid Acacia woodland, central Australia".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 118.3(2013):1168-1185.
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