Feedbacks of Soil Inoculum of Mycorrhizal Fungi Altered 
by N Deposition on the Growth of a Native Shrub and an Invasive Annual Grass

Sigüenza, Concepción; Corkidi, Lea; Allen, Edith B.

doi:10.1007/s11104-006-9034-2

Cited by 48 publications

(47 citation statements)

References 68 publications

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“…It is possible that the changes in abundance and richness of the soil bacteria observed by Mello et al (2013) induced a flux in soil nitrogen (and possibly carbon) which, in turn, may have influenced the AMF community. In addition, different plant communities (in terms of frequency of species, coverage) inside and outside the brûlé can also promote differences in nutrient cycling and modify local soil nutrient concentrations ( Sigüenza et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungal diversity in the Tuber melanosporum brûlé

et al. 2015

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The development of the fruiting body (truffle) of the ectomycorrhizal fungus Tuber melanosporum is associated with the production of an area (commonly referred to with the French word brûlé) around its symbiotic plant that has scanty vegetation. As truffles produce metabolites that can mediate fungal-plant interactions, the authors wondered whether the brûlé could affect the arbuscular mycorrhizal fungi (AMF) that colonize the patchy herbaceous plants inside the brûlé. A morphological evaluation of the roots of plants collected in 2009 from a T. melanosporum/Quercus pubescens brûlé in France has shown that the herbaceous plants are colonized by AMF to a great extent. An analysis of the 18S rRNA sequences obtained from roots and soil inside the brûlé has shown that the AMF community structure seemed to be affected in the soil inside the brûlé, where less richness was observed compared to outside the brûlé.

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Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungal diversity in the Tuber melanosporum brûlé

et al. 2015

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“…The diversity and density of arbuscular mycorrhizal spores in soil at CSS sites along a N-deposition gradient was significantly reduced at high N deposition sites (.10 kg NÁha À1 Áyr À1 ; Egerton-Warburton and Allen 2000, Sigu¨enza et al 2006b) along an urban-to-rural N-deposition gradient (Padgett et al 1999). Further studies suggested a negative feedback of N deposition, mediated via selection for growth-depressing mycorrhizal strains that are not effective mutualists (Sigu¨enza et al 2006a).…”

Section: Mediterranean Vegetationmentioning

confidence: 92%

Global assessment of nitrogen deposition effects on terrestrial plant diversity: a synthesis

Bobbink

Hicks

Galloway

et al. 2010

Ecological Applications

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Abstract. Atmospheric nitrogen (N) deposition is a recognized threat to plant diversity in temperate and northern parts of Europe and North America. This paper assesses evidence from field experiments for N deposition effects and thresholds for terrestrial plant diversity protection across a latitudinal range of main categories of ecosystems, from arctic and boreal systems to tropical forests. Current thinking on the mechanisms of N deposition effects on plant diversity, the global distribution of G200 ecoregions, and current and future (2030) estimates of atmospheric N-deposition rates are then used to identify the risks to plant diversity in all major ecosystem types now and in the future.This synthesis paper clearly shows that N accumulation is the main driver of changes to species composition across the whole range of different ecosystem types by driving the competitive interactions that lead to composition change and/or making conditions unfavorable for some species. Other effects such as direct toxicity of nitrogen gases and aerosols, long-term negative effects of increased ammonium and ammonia availability, soil-mediated effects of acidification, and secondary stress and disturbance are more ecosystem-and site-specific and often play a supporting role. N deposition effects in mediterranean ecosystems have now been identified, leading to a first estimate of an effect threshold. Importantly, ecosystems thought of as not N limited, such as tropical and subtropical systems, may be more vulnerable in the regeneration phase, in situations where heterogeneity in N availability is reduced by atmospheric N deposition, on sandy soils, or in montane areas.Critical loads are effect thresholds for N deposition, and the critical load concept has helped European governments make progress toward reducing N loads on sensitive ecosystems. More needs to be done in Europe and North America, especially for the more sensitive ecosystem types, including several ecosystems of high conservation importance.The results of this assessment show that the vulnerable regions outside Europe and North America which have not received enough attention are ecoregions in eastern and southern Asia (China, India), an important part of the mediterranean ecoregion (California, southern Europe), and in the coming decades several subtropical and tropical parts of Latin America and Africa. Reductions in plant diversity by increased atmospheric N deposition may be more widespread than first thought, and more targeted studies are required in low background areas, especially in the G200 ecoregions.

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“…It is noteworthy that the CL for both CSS vegetation (exotic grass cover, native forb richness) and AMF (root colonization, spore density) were the same. The mechanism for this may be that as N increases, the highly mutualistic native species decline and are replaced by grasses that are less dependent on mycorrhizae (Sigüenza et al, 2006a).…”

Section: Coastal Sage Scrub Critical Loadsmentioning

confidence: 99%