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Phytotoxicity, not nitrogen immobilization, explains plant litter inhibitory effects: evidence from solid-state 13C NMR spectroscopy. | LitMetric

AI Article Synopsis

  • Litter decomposition is crucial for providing nutrients to ecosystems but can also hinder seedling growth and root development.
  • The study aimed to evaluate how different litter types impact seed germination and root proliferation, as well as the effects of harmful compounds and nutrient retention.
  • Findings indicated that all litter types initially inhibited seedling growth, with effects decreasing over time; the use of activated carbon can alleviate this inhibition, and chemical analysis showed predictable relationships between litter composition and its inhibitory effects.

Article Abstract

Litter decomposition provides nutrients that sustain ecosystem productivity, but litter may also hamper root proliferation. The objectives of this work were to assess the inhibitory effect of litter decomposition on seedling growth and root proliferation; to study the role of nutrient immobilization and phytotoxicity; and to characterize decomposing litter by (13)C NMR spectroscopy. A litter-bag experiment was carried out for 180 d with 16 litter types. Litter inhibitory effects were assessed by two bioassays: seed germination and root proliferation bioassays. Activated carbon (C) and nutrient solutions were used to evaluate the effects of phytotoxic factors and nutrient immobilization. An inhibitory effect was found for all species in the early phase of decomposition, followed by a decrease over time. The addition of activated C to litter removed this inhibition. No evidence of nutrient immobilization was found in the analysis of nitrogen dynamics. NMR revealed consistent chemical changes during decomposition, with a decrease in O-alkyl and an increase in alkyl and methoxyl C. Significant correlations were found among inhibitory effects, the litter decay rate and indices derived from NMR. The results show that it is possible to predict litter inhibitory effects across a range of litter types on the basis of their chemical composition.

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Source
http://dx.doi.org/10.1111/j.1469-8137.2011.03765.xDOI Listing

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