WorldCat Identities

Rønn, Regin

Overview
Works: 18 works in 23 publications in 2 languages and 38 library holdings
Roles: Other, Author
Publication Timeline
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Most widely held works by Regin Rønn
De studerendes udbytte af kollokvier og forelæsninger på faget jordbundsbiologi : universitetspædagogisk projekt - 2003 by Regin Rønn( Book )

2 editions published in 2005 in Danish and held by 2 WorldCat member libraries worldwide

Exploring the diversity of Nivicolous Myxomycetes: An analysis of the genetic diversity, species distribution and community composition by Mathilde Borg Dahl( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

CNDs skriftserie. Studieårgangene 1999-2000 på geografi( )

in Danish and held by 2 WorldCat member libraries worldwide

CNDs skriftserie. Studieforløbsundersøgelser i naturvidenskab : en antologi( )

in Danish and held by 2 WorldCat member libraries worldwide

CNDs skriftserie. Kammeratlæring på førstekursus i mekanik( )

in Danish and held by 2 WorldCat member libraries worldwide

CNDs skriftserie. Projekt Rum til Bedre Læring( )

in Danish and held by 2 WorldCat member libraries worldwide

CNDs skriftserie. Om studiestarterne 2002 på nanoteknologistudiet på Københavns Universitet( )

in Danish and held by 2 WorldCat member libraries worldwide

The relative importance of the bacterial pathway and soil inorganic nitrogen increase across an extreme wood‐ash application gradient( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Abstract: Ash from combustion of biofuels, for example wood chips, is often deposited as waste, but due to its high content of essential plant nutrients and alkalinity, it has been proposed to recycle ash as a fertilizer and liming agent in biofuel production forest. However, current legislation sets rather strict limitations for wood‐ash application in biofuel production systems. The soil microfood web, that is microorganisms and their microfaunal grazers, protozoa and nematodes, is pivotal for essential ecosystem processes such as decomposition and plant nutrient release. Therefore, a thorough assessment of the impacts on microfood web structure and functioning must precede actions towards raising the currently allowed application rates. In a Danish Norway spruce plantation, we evaluate the impact of wood ash applied at dosages from 0 to the extreme case of 90tashha −1 on the microfood web, the bacterial community structure, soil content of inorganic nitrogen, organic matter, dissolved organic carbon and nitrogen. Using structural equationmodelling (SEM), we disentangled the direct effect of the disturbance imposed by ash per se, the associated pH increase and changes in prey abundance on individual organism groups in the microfood web. The SEM showed that the pH rise was the main driver of increasing abundances of culturable heterotrophic bacteria with increasing ash doses, and via trophical transfer, this also manifested as higher abundances of bacterial grazers. Fungal‐feeding nematodes were unaffected by ash, whereas carnivorous/omnivorous nematodes decreased due to the direct effect of ash. Increasing ash doses enhanced the difference between bacterial communities of control plots and ash‐amended plots. The ash‐induced stimulation of culturable heterotrophic bacteria and bacterial grazers increased inorganic nitrogen availability at ash doses of 9tha −1 and above. Hence, raised limits for ash application may potentially benefit tree growth via enhanced N mineralization activity of the soil food web. Abstract : Structural equation model of effects of wood ash application doses on soil pH and soil organisms
Wood ash application increases pH but does not harm the soil mesofauna( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract: Application of bioash from biofuel combustion to soil supports nutrient recycling, but may have unwanted and detrimental ecotoxicological side-effects, as the ash is a complex mixture of compounds that could affect soil invertebrates directly or through changes in their food or habitat conditions. To examine this, we performed laboratory toxicity studies of the effects of wood-ash added to an agricultural soil and the organic horizon of a coniferous plantation soil with the detrivore soil collembolans Folsomia candida and Onychiurus yodai, the gamasid predaceous mite Hypoaspis aculeifer, and the enchytraeid worm Enchytraeus crypticus . We used ash concentrations spanning 0–75gkg −1 soil. As ash increases pH we compared bioash effects with effects of calcium hydroxide, Ca(OH)2, the main liming component of ash. Only high ash concentrations above 15gkg −1 agricultural soil or 17tha −1 had significant effects on the collembolans. The wood ash neither affected H.aculeifer nor E.crypticus . The estimated osmolalities of Ca(OH)2 and the wood ash were similar at the LC50 concentration level. We conclude that short-term chronic effects of wood ash differ among different soil types, and osmotic stress is the likely cause of effects while high pH and heavy metals is of minor importance. Graphical abstract: Highlights: Wood ash applied to agricultural soil had effects on collembolans at 15gkg −1 /17.4tha −1 . Wood ash had no effect in organic soil. The wood ash effect is mainly due to osmotic stress. Abstract : Wood ash is not harmful to forest floor mesofauna
 
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Languages
Danish (20)

English (3)