Arid
DOI10.1007/s11104-012-1404-3
Biological soil crusts increase the resistance of soil nitrogen dynamics to changes in temperatures in a semi-arid ecosystem
Delgado-Baquerizo, Manuel1; Maestre, Fernando T.2; Gallardo, Antonio1
通讯作者Delgado-Baquerizo, Manuel
来源期刊PLANT AND SOIL
ISSN0032-079X
EISSN1573-5036
出版年2013
卷号366期号:1-2页码:35-47
英文摘要

Biological soil crusts (BSCs), composed of mosses, lichens, liverworts and cyanobacteria, are a key component of arid and semi-arid ecosystems worldwide, and play key roles modulating several aspects of the nitrogen (N) cycle, such as N fixation and mineralization. While the performance of its constituent organisms largely depends on moisture and rainfall conditions, the influence of these environmental factors on N transformations under BSC soils has not been evaluated before.


The study was done using soils collected from areas devoid of vascular plants with and without lichen-dominated BSCs from a semi-arid Stipa tenacissima grassland. Soil samples were incubated under different temperature (T) and soil water content (SWC) conditions, and changes in microbial biomass-N, dissolved organic nitrogen (DON), amino acids, ammonium, nitrate and both inorganic N were monitored. To evaluate how BSCs modulate the resistance of the soil to changes in T and SWC, we estimated the Orwin and Wardle Resistance index.


The different variables studied were more affected by changes in T than by variations in SWC at both BSC-dominated and bare ground soils. However, under BSCs, a change in the dominance of N processes from a net nitrification to a net ammonification was observed at the highest SWC, regardless of T.


Our results suggest that the N cycle is more resistant to changes in T in BSC-dominated than in bare ground areas. They also indicate that BSCs could play a key role in minimizing the likely impacts of climate change on the dynamics of N in semi-arid environments, given the prevalence and cover of these organisms worldwide.


英文关键词Semiarid ecosystem N depolymerization rate N mineralization rate DON
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000317988600004
WOS关键词DISSOLVED ORGANIC NITROGEN ; COLORADO PLATEAU ; BIOGEOCHEMICAL CYCLES ; MICROBIAL BIOMASS ; WATER ; RESPONSES ; CARBON ; MINERALIZATION ; INSIGHTS ; MODULATE
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179254
作者单位1.Univ Pablo de Olavide, Dept Sistemas Fis Quim & Nat, Seville 41013, Spain;
2.Univ Rey Juan Carlos, Escuela Super Ciencias Expt & Tecnol, Area Biodiversidad & Conservac, Dept Biol & Geol, Mostoles 28933, Spain
推荐引用方式
GB/T 7714
Delgado-Baquerizo, Manuel,Maestre, Fernando T.,Gallardo, Antonio. Biological soil crusts increase the resistance of soil nitrogen dynamics to changes in temperatures in a semi-arid ecosystem[J],2013,366(1-2):35-47.
APA Delgado-Baquerizo, Manuel,Maestre, Fernando T.,&Gallardo, Antonio.(2013).Biological soil crusts increase the resistance of soil nitrogen dynamics to changes in temperatures in a semi-arid ecosystem.PLANT AND SOIL,366(1-2),35-47.
MLA Delgado-Baquerizo, Manuel,et al."Biological soil crusts increase the resistance of soil nitrogen dynamics to changes in temperatures in a semi-arid ecosystem".PLANT AND SOIL 366.1-2(2013):35-47.
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