期刊
PEDOBIOLOGIA
卷 56, 期 3, 页码 147-152出版社
ELSEVIER GMBH
DOI: 10.1016/j.pedobi.2013.03.004
关键词
Stable isotopes; Litter decomposition; Labile N; Mycelial connection; Detrital food webs; Isotopic baseline
资金
- Russian Foundation for Basic Research [11-04-00948]
- Wildlife Program of the Russian Academy of Sciences
Leaf litter is the main source of nutrient and energy input into the soil. Therefore, detailed knowledge on the short-term variations in the isotopic composition of plant litter is needed for correctly estimating the isotopic baseline in stable isotope-based studies on detrital foodwebs. In a laboratory experiment, standardized fragments of freshly fallen leaves of Quercus robur, Ulmus glabra, and Populus tremula were incubated on the surface of natural or N-15-labeled soil during 260 days. At the end of the experiment, the remaining mass represented 62, 53 and 50% of the initial mass for oak, elm and aspen litter, respectively. There was a small decrease in the mean delta C-13 values during the initial stages of decomposition, although it was inconsistent among the three litter species tested and did not exceed 1.0%. during the decomposition period. Calculations based on the total N content, as well as the isotope mixing model suggested that up to 50% of the total litter N was incorporated from the underlying soil. The rates of N transfer from the soil to litter were not affected by the disruption of mycelial connections between the soil and litter. As indicated by delta N-15 values of filter paper placed on the soil surface, labile soil N was depleted by 6-8%. in N-15 relative to bulk soil organic matter. However, in the given experimental settings the input of N-15-depleted labile N from mineral soil was likely counterbalanced by an increase in the N-15-enriched microbial biomass and bulk litter delta N-15 values changed little. (C) 2013 Elsevier GmbH. All rights reserved.
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