Temperature sensitivity and decomposition rate of 101 leaf litter types from Mediterranean ecosystems.

Autor: Bonanomi G; Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, NA, Italy; Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy; BAT Center-Interuniversity Center for Studies on Bioinspired Agro-Environmental Technology, University of Naples Federico II, Naples, Italy., Motti R; Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, NA, Italy., De Marco A; Department of Pharmacy, University of Naples Federico II, Via Montesano 49, 80131 Naples, Italy; BAT Center-Interuniversity Center for Studies on Bioinspired Agro-Environmental Technology, University of Naples Federico II, Naples, Italy., Idbella M; Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, NA, Italy; Laboratory of Biosciences, Faculty of Sciences and Techniques, Hassan II University, Casablanca, Morocco. Electronic address: mohamed.idbella@unina.it.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Oct 10; Vol. 894, pp. 165026. Date of Electronic Publication: 2023 Jun 19.
DOI: 10.1016/j.scitotenv.2023.165026
Abstrakt: Litter decomposition is a fundamental process, and the number of published studies has steadily increased in recent decades. However, few experiments have systematically compared a large number of litter types and evaluated their temperature sensitivity. We conducted a two-year experiment on the decomposition of litter bags containing 101 leaf litter sampled in Mediterranean ecosystems and incubated under laboratory conditions at 4 °C, 14 °C, and 24 °C. Litter was chemically characterized and analysed for carbon (C), nitrogen (N), cellulose and lignin concentration, C/N, and lignin/N ratios, which serve as predictors of decomposition rate. The sensitivity of litter decay rate to temperature was evaluated using Q 10 . Leaf litter chemistry varied widely in nitrogen content (range 0.52-6.80 %), lignin content (range 1.53-49.31 %), C/N ratio (range 5.21-77.78), and lignin/N ratio (range 0.34-34.90). Litter decomposition rate was negatively related to initial lignin concentration, lignin/N ratio, and C/N ratio, but only in the early stage. In the late stages of decomposition, litter decay rate was negatively correlated with initial N concentration but positively correlated with C/N and lignin/N ratios. Temperature sensitivity was negatively correlated with N concentration and positively correlated with lignin and lignin/N ratio. It is noteworthy that, contrary to expectations, temperature sensitivity exhibited a hump-shaped relationship with decay rate. N, C/N, and lignin/N ratios should be used with caution because their predictive power is reversed with respect to decomposition rate during the decomposition process. In addition, the new finding that temperature sensitivity has a hump-shaped relationship with decomposition rate deserves further confirmation and could be considered in ecosystem-level organic C modeling.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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