干旱区生态环境知识资源中心(Arid): Temporal and spatial variability in soil CO2 efflux in the patagonian steppe

Arid

DOI	10.1007/s11104-019-04268-7
	Temporal and spatial variability in soil CO2 efflux in the patagonian steppe
	Silletta, Luisina Carbonell 1,2,3; Cavallaro, Agustin 1,2,3; Kowal, Ruth 1,2,3; Pereyra, Daniel A.1,2,3; Silva, Roxana A.4; Arias, Nadia S.1,2,3; Goldstein, Guillermo 5,6; Scholz, Fabian G.1,2,3; Bucci, Sandra J.1,2,3
通讯作者	Bucci, Sandra J.
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2019
卷号	444 期号:1-2 页码:165-176
英文摘要	Aims Soil respiration is a major flux of CO2 to the atmosphere. Despite its significance there is a limited understanding of its magnitude, controlling factors and how it varies over time and space in arid ecosystems. We evaluated the temporal pattern of soil CO2 efflux and their response to rain pulses in a patagonian steppe, taking into account the spatial heterogeneity (bare soil and vegetated patches). Materials and methods We measured soil CO2 efflux in bare soil and vegetated patches along the year. We also analyzed physical and chemical soil traits, root density and heterotrophic bacterial count. Results Soil water content and temperature exhibited seasonal variability and it was larger in bare soil patches than in vegetated patches. Root density, organic matter and phosphorus were higher in vegetated patches than in bare soil. CO2 efflux was 48% higher in vegetated patches than in bare soil patches. Soil CO2 efflux decreased from summer to winter, reaching its maximum value (about 0.6 mu mol m(2) s(-1)) in spring. In both patch types, soil CO2 efflux was explained by the interaction between soil temperature and soil water content. Soil CO2 efflux also was positively correlated with soil root density. Bare soil and vegetated patches exhibited distinct response to a rain pulses. Vegetated patches were highly sensitive to rainfall events, generating a large CO2 pulse, returning to previous values after three days. Bare soil CO2 efflux did not exhibit significant changes after a rain pulse. Conclusions In patagonian arid ecosystems, the seasonal variation in soil respiration is explained mainly by the interaction between soil temperature and water content. Bare soil patches had higher water content but lower root density resulting in lower soil CO2 respiration than vegetated patches. However, at ecosystem level the contribution of bare soil to total soil CO2 efflux was similar to the contribution of vegetated patches because bare soil cover is 65% in the study area. Changes in the number of small rain events as well as changes in plant cover could have large consequences on soil ecology and biochemistry in dry and heterogeneous ecosystems.
英文关键词	Arid ecosystem Soil respiration Rain pulse Plant roots
类型	Article
语种	英语
国家	Argentina ; USA
收录类别	SCI-E
WOS记录号	WOS:000498997900011
WOS关键词	PRECIPITATION PULSES ; PATCH STRUCTURE ; ORGANIC-MATTER ; SONORAN DESERT ; CLIMATE-CHANGE ; ROOTING DEPTH ; WATER CONTENT ; RESPIRATION ; RESPONSES ; TEMPERATURE
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310590
作者单位	1.Consejo Nacl Invest Cient & Tecn, Inst Biociencias Patagonia INBIOP, Grp Estudios Biofis & Ecofisiol GEBEF, RA-9000 Comodoro Rivadavia, Argentina; 2.Univ Nacl Patagonia San Juan Bosco, RA-9000 Comodoro Rivadavia, Argentina; 3.Fac Ciencias Nat & Ciencias Salud, RA-9000 Comodoro Rivadavia, Argentina; 4.CONICET UNPSJB, INBIOP, Grp Microbiol Bacteriana, Comodoro Rivadavia, Argentina; 5.UBA CONICET, Inst Ecol Genet & Evoluc Buenos Aires, Buenos Aires, DF, Argentina; 6.Univ Miami, Dept Biol, Coral Gables, FL 33124 USA
推荐引用方式 GB/T 7714	Silletta, Luisina Carbonell,Cavallaro, Agustin,Kowal, Ruth,et al. Temporal and spatial variability in soil CO2 efflux in the patagonian steppe[J],2019,444(1-2):165-176.
APA	Silletta, Luisina Carbonell.,Cavallaro, Agustin.,Kowal, Ruth.,Pereyra, Daniel A..,Silva, Roxana A..,...&Bucci, Sandra J..(2019).Temporal and spatial variability in soil CO2 efflux in the patagonian steppe.PLANT AND SOIL,444(1-2),165-176.
MLA	Silletta, Luisina Carbonell,et al."Temporal and spatial variability in soil CO2 efflux in the patagonian steppe".PLANT AND SOIL 444.1-2(2019):165-176.