干旱区生态环境知识资源中心(Arid): Altered leaf litter quality exacerbates the negative impact of climate change on decomposition

Arid

DOI	10.1111/1365-2745.13168
	Altered leaf litter quality exacerbates the negative impact of climate change on decomposition
	Prieto, Ivan 1; Almagro, Maria 2; Bastida, Felipe 1; Ignacio Querejeta, Jose 1
通讯作者	Prieto, Ivan
来源期刊	JOURNAL OF ECOLOGY
ISSN	0022-0477
EISSN	1365-2745
出版年	2019
卷号	107 期号:5 页码:2364-2382
英文摘要	1. Leaf litter decomposition is a key component of global biogeochemical cycles that influence soil carbon storage, nutrient availability and plant productivity. Ongoing climate change will lead to warmer and drier conditions in many dryland regions, potentially affecting litter decomposition and nutrient dynamics. Climate change effects can be direct and/or indirect, for example, through changes in litter quality, yet their relative importance on litter decomposition remains unclear. 2. We conducted a manipulative study in a semi-arid shrubland to assess the effects of leaf litter quality, forecasted climate change, that is, +2.5 degrees C warming (W), 30% rainfall reduction (RR) as well as their interaction (W + RR) to elucidate their relative effects on litter decomposition. 3. Climatic effects alone reduced decomposition of a homogeneous Control leaf litter collected from Helianthemum squamatum shrubs growing in unmanipulated plots by 23.4%, 18.1% and 29.8% in the W, RR and W + RR treatments respectively. Leaf litter quality was lower in shrubs that had been growing in warmed plots (W and W + RR), as they had lower nutrient concentrations (P, Fe) and higher C:N and C:P ratios than leaf litter produced under ambient (Control) conditions. Lignin concentration was significantly lower in litter from W + RR plots, yet when both climate and litter quality were considered simultaneously, decomposition rates were 32.0%, 26.3% and 39.9% lower in W, RR and W + RR plots compared to Controls. In addition, we found greater microbial N immobilization in leaf litter incubated within warmed (W and W + RR) than within non- warmed plots (Control and RR). Structural equation modelling showed that higher litter moisture and microbial biomasscontents stimulated decomposition. Simulated climate change (W, RR and W + RR) reduced decomposition indirectly by negatively affecting litter moisture contents and litter microbial biomass. Microbial nitrogen immobilization was stimulated by the lower quality (i.e. high C:N ratios) of the leaf litter collected in shrubs from warmed plots (W and W + RR). 4. Synthesis. Our findings indicate that forecasted climate change conditions slow down C and N cycling in a dryland ecosystem, an effect that is further exacerbated by climate change-induced reductions in litter quality and related reductions in bacterial and fungal biomass in litter.
英文关键词	climate change drylands Global change ecology litter mass loss litter traits microbial community structure nitrogen warming
类型	Article
语种	英语
国家	Spain
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000484311000027
WOS关键词	SOIL ORGANIC-MATTER ; PLANT LITTER ; CARBON-CYCLE ; TERRESTRIAL ECOSYSTEMS ; MICROBIAL COMMUNITIES ; NUTRIENT RESORPTION ; ECONOMICS SPECTRUM ; RESPONSES ; NITROGEN ; TRAITS
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/2XILL650/216936
作者单位	1.CSIC, CEBAS, Dept Conservac Suelos & Agua, Murcia, Spain; 2.BC3, Bilbao, Spain
推荐引用方式 GB/T 7714	Prieto, Ivan,Almagro, Maria,Bastida, Felipe,et al. Altered leaf litter quality exacerbates the negative impact of climate change on decomposition[J],2019,107(5):2364-2382.
APA	Prieto, Ivan,Almagro, Maria,Bastida, Felipe,&Ignacio Querejeta, Jose.(2019).Altered leaf litter quality exacerbates the negative impact of climate change on decomposition.JOURNAL OF ECOLOGY,107(5),2364-2382.
MLA	Prieto, Ivan,et al."Altered leaf litter quality exacerbates the negative impact of climate change on decomposition".JOURNAL OF ECOLOGY 107.5(2019):2364-2382.