Arid
DOI10.1016/j.soilbio.2013.02.015
Biological soil crusts promote N accumulation in response to dew events in dryland soils
Delgado-Baquerizo, Manuel1,2; Maestre, Fernando T.2; Rodriguez, Jesus G. P.1; Gallardo, Antonio1
通讯作者Delgado-Baquerizo, Manuel
来源期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
出版年2013
卷号62页码:22-27
英文摘要

Dew is an important source of water in drylands, particularly for biological soil crusts (BSCs), which are soil communities dominated by lichens, mosses and cyanobacteria that are prevalent in these environments and play important roles in nutrient cycling. While BSCs can retain and use water from dew, the effects of dew events on the cycling of nitrogen (N) and carbon (C) in BSC-dominated ecosystems are largely unknown. We conducted an experiment to evaluate the effects of BSCs and dew on N and C cycling; intact soil cores from either bare ground or BSC-dominated microsites were incubated over 14 days under control and artificial dew addition treatments. A positive increment in the amount of total available N and phenols was observed in response to dew events under BSCs. We also found an increase in the concentration of dissolved organic N, as well as in the pentoses:hexoses ratio, under BSCs, suggesting that dew promoted an increase in the decomposition of organic matter at this microsite. The increase in the amount of available N commonly observed under BSCs has been traditionally associated with the fixation of atmospheric N-2 by BSC-forming cyanobacteria and cyanolichens. Our results provide a complementary explanation for such an increase: the stimulation of microbial activity of the microorganisms associated with BSCs by dew inputs. These effects of dew may have important implications for nutrient cycling in drylands, where dew events are common and BSCs cover large areas. (C) 2013 Elsevier Ltd. All rights reserved.


英文关键词DON Dry lands Carbohydrates Phenols Pentose:hexose ratio
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000320425800004
WOS关键词MICROBIAL BIOMASS ; NEGEV DESERT ; NITROGEN-FIXATION ; WATER PULSES ; PRECIPITATION ; LIMITATIONS ; ECOSYSTEMS ; DIVERSITY ; INSIGHTS ; MODULATE
WOS类目Soil Science
WOS研究方向Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179970
作者单位1.Univ Pablo Olavide, Dept Sistemas Fis Quim & Nat, Seville 41013, Spain;
2.Univ Rey Juan Carlos, Escuela Super Ciencias Expt & Tecnol, Dept Biol & Geol, Area Biodiversidad & Conservac, Mostoles 28933, Spain
推荐引用方式
GB/T 7714
Delgado-Baquerizo, Manuel,Maestre, Fernando T.,Rodriguez, Jesus G. P.,et al. Biological soil crusts promote N accumulation in response to dew events in dryland soils[J],2013,62:22-27.
APA Delgado-Baquerizo, Manuel,Maestre, Fernando T.,Rodriguez, Jesus G. P.,&Gallardo, Antonio.(2013).Biological soil crusts promote N accumulation in response to dew events in dryland soils.SOIL BIOLOGY & BIOCHEMISTRY,62,22-27.
MLA Delgado-Baquerizo, Manuel,et al."Biological soil crusts promote N accumulation in response to dew events in dryland soils".SOIL BIOLOGY & BIOCHEMISTRY 62(2013):22-27.
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