Počet záznamů: 1
Major mechanisms contributing to the macrofauna-mediated slow down of litter decomposition
- 1.
SYSNO ASEP 0448536 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Major mechanisms contributing to the macrofauna-mediated slow down of litter decomposition Tvůrce(i) Frouz, Jan (BC-A) RID, ORCID
Špaldoňová, A. (CZ)
Lhotáková, Z. (CZ)
Cajthaml, T. (CZ)Zdroj.dok. Soil Biology and Biochemistry. - : Elsevier - ISSN 0038-0717
Roč. 91, December (2015), s. 23-31Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova alkalinization ; Bibio ; CN ratio ; litter decomposition ; mineralization ; pyrolysis Vědní obor RIV DF - Pedologie Institucionální podpora BC-A - RVO:60077344 UT WOS 000364502900003 EID SCOPUS 84941249049 DOI 10.1016/j.soilbio.2015.08.024 Anotace To understand why excrements of soil macrofauna often decompose more slowly than leaf litter, we fed Bibio marci larvae the litter of tree species differing in litter quality (Alnus glutinosa, Salix caprea, Quercus robur) and then measured respiration induced by litter and excrements. We also measured respiration induced by the same litter artificially modified to mimic faunal effects; the litter was modified by grinding, grinding with alkalinization to pH = 11, grinding with coating by kaolinite, and grinding with both alkalinization and coating. Decomposition of excrements tended to be slower for willow and was significantly slower for oak and alder than for the corresponding litter. With oak, decomposition was slower for all artificially modified litter than for non-modified litter. The reduction in the decomposition was similar for excrements and for alder and willow litter that was ground, coated, and alkalinized. In alder, a similar reduction was found in ground and alkalinized litter. 13C NMR indicated that gut passage increases aliphatic components and decreases polysaccharides. Pyrolysis indicated that gut passage increases the ratio of guaiacyl to hydroxymethyl derivatives in lignin. Our findings indicate that the decreased decomposition rate of excrements might result from the removal of easily available polysaccharides, the increase in aliphatic components, an increase in the resistant components of lignin, the accumulation of microbial cell walls, and the binding of nitrogen into complexes with aromatic components. Several of these mechanisms are supported or determined by litter alkalinization during gut passage. Pracoviště Biologické centrum (od r. 2006) Kontakt Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Rok sběru 2016
Počet záznamů: 1