Data/hora: 20/06/2024 06:58:10

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 28/07/1995
Data da última atualização: | 28/07/1995
Autoria: | LINHARES, L. F.; MARTIN, J. P.
Título: | Decomposition in soil of the humic acid-type polymers (Melanins) of Eurotium echinulatum, Aspergillus glaucus Sp. and other fungi.
Ano de publicação: | 1978
Fonte/Imprenta: | Soil Science Society of America Journal, v.42, n.5, p.738-743, 1978.
Idioma: | Inglês
Conteúdo: | Studies were conducted to compare the decomposition rates in soil of 14C-labeled humic acid-type polymers (melanins) of Eurotium echinulatum and Aspergillus glaucus sp. with those of other fungal melanins, soil and peat humic acids, fungal cells, nondialysable culture medium polymers not precipitaded by acid, and other organic residues. Carbon and N contents, COOH groups, and total acidity were also determined for the fungal products. After 12 weeks incubation at 22C the percentages of the added 14C activity envolved as 14CO2 from the acid-precipitable fungal melanis ranged from 4-6% for E. echinulatum, 4-13% for A, glaucus, 6-8% for Hendersonula toruloides and 6 to 50% for Stachybotrys atra. The fungal polymers were almost as resistant to biodegreadation as soil or peat humic acids. The funagal cells and culture medium polymers not precipitated by acid lost from 26-58% of the applied C, which compared with losses of 50-75% for hyaline fungal cells, corn stalks, and wheat straw. The N source and growth conditions did not influence biodegradability. The C contents of the melanis ranged from 51-60%, the N from 1.4-6.8%, COOH groups from 81-385 meq/100 g, and total acidity from 375-876 meq/100 g.
Palavras-Chave: | Decomposition; Fungus; Humic; Humico; Melanins; Polimere; Polymer.
Thesagro: | Decomposição; Fungo; Solo.
Thesaurus Nal: | soil.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (28808-1) - ADD - SP - -- - SP0500 -  - 0500 - DIS