Organic matter decomposition and carbon content in soil fractions as affected by a gradient of labile carbon input to a temperate forest soil

Autor:	Kateřina Jandová, Jaroslav Kukla, Veronika Jílková, Josef Starý, Tomáš Cajthaml, Miloslav Devetter, Anna Vacířová
Rok vydání:	2020
Předmět:	chemistry.chemical_classification 0303 health sciences Soil organic matter Bulk soil Soil Science Temperate forest 04 agricultural and veterinary sciences complex mixtures Microbiology humanities 03 medical and health sciences chemistry Environmental chemistry Soil water 040103 agronomy & agriculture Temperate climate 0401 agriculture forestry and fisheries Soil horizon Organic matter Agronomy and Crop Science Subsoil 030304 developmental biology
Zdroj:	Biology and Fertility of Soils. 56:411-421
ISSN:	1432-0789 0178-2762
DOI:	10.1007/s00374-020-01433-4
Popis:	Labile carbon (C) input to soils is expected to affect soil organic matter (SOM) decomposition and soil organic C (SOC) stocks in temperate coniferous forests. We hypothesized that the SOM decomposition rate, C content in soil fractions, and microbial and faunal abundance and activity were increased along the gradient in labile C input around wood ant nests. Three distances from the nest that differed in annual labile C input to soil were selected: 4 m with 6379 mg C m−2, 30 m with 9060 mg C m−2, and 70 m with 9215 mg C m−2. Soil from the organic horizon (Oe+Oa), surface mineral horizon (A), and subsoil mineral horizon (B) was analyzed for C content in soil fractions and for activity and abundance of soil microorganisms and fauna. In addition, a 1-year litter-bag and soil-bag decomposition experiment was conducted. Although the rate of soil decomposition did not differ along the labile C input gradient, the rate of litter decomposition in the B horizon increased as labile C input increased with distance from the nest. Correspondingly, the C content in bulk soil and in the labile and less-protected soil fractions in the B horizon decreased as labile C input increased. We infer that, because the O and A horizons are less C-limited than the B horizon, the changes in the labile C input along the gradient affected the B horizon more than the surface O and A horizons. However, soil microbial and faunal activity and abundances were not consistently affected by the gradient. Apparently, C stocks in soil fractions are more important for microbial and faunal communities than labile C inputs. Although the results indicate that SOC content changes very slowly in the coniferous forest soil of the current study, increases in the input of natural labile C leads to decreases in the SOC stock in the B horizon. By increasing the labile C input to temperate forest soils, future increases in atmospheric CO2 concentration may therefore lead to a significant loss of SOC in deep soil layers.
Databáze:	OpenAIRE
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