干旱区生态环境知识资源中心(Arid): Worlds apart: Location above- or below-ground determines plant litter decomposition in a semi-arid Patagonian steppe

Arid

DOI	10.1111/1365-2745.13688
	Worlds apart: Location above- or below-ground determines plant litter decomposition in a semi-arid Patagonian steppe
	Berenstecher, Paula; Araujo, Patricia, I; Austin, Amy T.
通讯作者	Austin, AT (corresponding author), Univ Buenos Aires, Fac Agron, Inst Invest Fisiol & Ecol Vinculadas Agr IFEVA, Buenos Aires, DF, Argentina. ; Austin, AT (corresponding author), Univ Buenos Aires, Fac Agron, Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, DF, Argentina.
来源期刊	JOURNAL OF ECOLOGY
ISSN	0022-0477
EISSN	1365-2745
出版年	2021
英文摘要	While considerable attention has been devoted to how precipitation modulates net primary productivity in arid and semi-arid ecosystems, the emergence of multi-faceted controls on carbon (C) turnover suggests that there is much to be understood with respect to the mechanistic controls on plant litter decomposition. In the Patagonian steppe, we conducted a long-term factorial experiment, evaluating the importance of position, litter quality, tissue origin and soil resources on rates of C turnover under natural field conditions. Leaf and root litter of dominant grass species were placed in litterbags in different positions, on the soil surface and buried at 5-cm depth, with soil treatments of labile C, nitrogen (N) and their combination (C + N) over a 3-year period. As predicted, leaf litter decomposed significantly (nearly sixfold) faster above-ground than did root litter below-ground (p < 0.001). Surprisingly, root litter decomposed significantly faster than leaf litter above-ground (p < 0.001), and above-ground decomposition was not strongly affected by soil resource additions. Below-ground decomposition was largely determined by the interaction of litter quality and soil resource availability. Determining a C balance by integrating biomass allocation and primary productivity from this field site, combined with the data from this study, suggests large differences between the contribution of the above- and below-ground biomass to soil organic matter (SOM) pools and a long residence time of undecomposed root litter. Synthesis. Litter position clearly emerged as the predominant variable determining C turnover in this semi-arid steppe ecosystem, with litter quality and soil resources having significant, but more modest, effects. The near complete independence of above-ground litter decomposition from soil resources and rapid decomposition of surface litter, coupled with the counterintuitive relationships with litter quality, suggests that, in the long term, C loss from photodegradation may result in a minimal contribution of above-ground litter to SOM formation. These results have mechanistic implications for the distinct functionality of litter decomposition above- and below-ground in semi-arid ecosystems, and how these differential controls may alter the C balance due to future changes in climate and land use.
英文关键词	carbon cycle grasses leaf and root litter litter decomposition Pappostipa spp Patagonian steppe photodegradation semi-arid ecosystems
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000663451000001
WOS关键词	NORTHERN CHIHUAHUAN DESERT ; NET PRIMARY PRODUCTION ; SOIL ORGANIC-MATTER ; LONG-TERM ; ROOT LITTER ; NITROGEN DYNAMICS ; CARBON TURNOVER ; LEAF-LITTER ; MASS-LOSS ; PHOTODEGRADATION
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352319
作者单位	[Berenstecher, Paula; Araujo, Patricia, I; Austin, Amy T.] Univ Buenos Aires, Fac Agron, Inst Invest Fisiol & Ecol Vinculadas Agr IFEVA, Buenos Aires, DF, Argentina; [Berenstecher, Paula; Araujo, Patricia, I; Austin, Amy T.] Univ Buenos Aires, Fac Agron, Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, DF, Argentina; [Araujo, Patricia, I] Consejo Nacl Invest Cient & Tecn, INTA, Estn Expt Agr Pergamino, Buenos Aires, DF, Argentina
推荐引用方式 GB/T 7714	Berenstecher, Paula,Araujo, Patricia, I,Austin, Amy T.. Worlds apart: Location above- or below-ground determines plant litter decomposition in a semi-arid Patagonian steppe[J],2021.
APA	Berenstecher, Paula,Araujo, Patricia, I,&Austin, Amy T..(2021).Worlds apart: Location above- or below-ground determines plant litter decomposition in a semi-arid Patagonian steppe.JOURNAL OF ECOLOGY.
MLA	Berenstecher, Paula,et al."Worlds apart: Location above- or below-ground determines plant litter decomposition in a semi-arid Patagonian steppe".JOURNAL OF ECOLOGY (2021).