Occurence of calcium oxalate in relation to the activity of fungi in forest litter and humus

Hintikka, Veikko; Korhonen, Kari; Näykki, Ossi

doi:10.29203/ka.1979.189

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…The finding that the pH of litter samples inoculated with C. dryophila decreased during the fungal growth is in concordance with those of earlier studies, which showed the secretion of oxalic and other organic acids by various basidiomycetous fungi (17,18,36). Organic acids not only support MnP activity but also have an effect of their own in the mobilization of humic material that might subsequently undergo enhanced depolymerization (3,9).…”

Section: Discussionsupporting

confidence: 81%

Degradation of Humic Acids by the Litter-Decomposing Basidiomycete Collybia dryophila

Steffen

Hatakka

Hofrichter

2002

Appl Environ Microbiol

142

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Section: Discussionsupporting

confidence: 81%

Degradation of Humic Acids by the Litter-Decomposing Basidiomycete Collybia dryophila

Steffen

Hatakka

Hofrichter

2002

Appl Environ Microbiol

142

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“…In the mean time, fungal, then bacterial biomass, is built-up, which constitutes a new food resource for further colonizers (Berg & Söderström 1979). These changes are accompanied by an increase in nitrogen (Berg 1988, Hasegawa & Takeda 1996, water (Virzo de Santo et al 1993) and metal content (Laskowski & Berg 1993), while fungal metabolism produces organic acids (Takao 1965, Hintikka et al 1979, Lapeyrie et al 1987, Devêvre et al 1996, melanins (Kuo & Alexander 1967, Butler et al 2001 and other metabolites, among them toxins and antibiotics have been widely reported (Wilkins 1948, Krywolap & Casida 1964, Land & Hult 1987, Betina 1989. Tannins, terpenes, and other secondary metabolites of coniferous litter exert a selective effect on fungal communities (Black & Dix 1976, Berg et al 1980, Lindeberg et al 1980, Lindeberg 1985, but are progressively degraded by microbial activity (Rai et al 1988, Lorenz et al 2000.…”

Section: How To Explain the Observed Successions?mentioning

confidence: 99%

Fungal Communities: Relation to Resource Succession

Ponge¹

2005

The Fungal Community

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An example of substrate succession: the colonization of pine needles by fungus flora Perhaps the most widely studied substrate succession was the successive development of fungal strains and other decomposer organisms at the inside of pine needles, from tree foliage to humified litter. Using litter bags and moist chamber cultures, Kendrick & Burges (1962) followed the fate of Scots pine needles (Pinus sylvestris L.) in the course of seasons and years and recognized several well-marked steps in the fungal succession. Their study was exemplary inasmuch as they displaced studies on fungal successions from the field of mycology to that of soil ecology. From their results, it appeared that needles, as leaves (Kinkel et al. 1987), were small temporary islands, the inhabitants of which evolved together with their habitat both in space (vertical litter transfer) and time (season, year), while internal resources became progressively depleted. This scheme was reminiscent of patterns and processes observed in the successional development of plant communities by Watt (1947). Other authors described similar sequences in other pine species, pointing on the worldwide occurrence of a few number of more or less pine-specific fungal colonizers succeeding each other in a linear way (Watson et al. 1974, Mitchell & Millar 1978a, Soma & Saitô 1979). Other interesting results of pine studies were that the course of fungal succession was strongly influenced by i) the start of colonization when the needle was still living (Mitchell et al. 1976,

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Occurrence of calcium oxalate in karri (Eucalyptus diversicolor F. Muell.) forest ecosystems of south western Australia

1983

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The amount of calcium in Eucalyptus diversicolor (karri) ecosystems is high in comparison with other eucalypt forest ecosystems in Australia. A large proportion of this calcium is present as crystalline Ca oxalate. Whewellite (CaCO·HO) accumulates in leaf tissue of the over- and understorey species. Up to 70% of the calcium in the leaves of karri is stored as whewellite, the highest concentrations occurring in the oldest leaves. Synthesis of Ca oxalate by karri may be related in part to the high levels of exchangeable soil calcium. Oxalate of plant origin is rapidly metabolized on the forest floor during decomposition of leaf litter. About 70% of the whewellite in fresh karri leaf litter is degraded during the first wet season following leaf fall. However, additional oxalate is formed in the soil and litter layer from microbial production of oxalic acid. These crystals are of the dihydrate calcium salt, weddelite (CaCCO· 2HO). Microbial production of oxalate, particularly by ectomycorrhizal fungi, may be an important mechanism for mobilizing of phosphate from the strongly phosphateadsorbing soils on which these forests grow.

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Occurence of calcium oxalate in relation to the activity of fungi in forest litter and humus

Cited by 10 publications

References 8 publications

Degradation of Humic Acids by the Litter-Decomposing Basidiomycete Collybia dryophila

Degradation of Humic Acids by the Litter-Decomposing Basidiomycete Collybia dryophila

Fungal Communities: Relation to Resource Succession

Occurrence of calcium oxalate in karri (Eucalyptus diversicolor F. Muell.) forest ecosystems of south western Australia

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