Carbon and nitrogen transfer in leaf litter mixtures |
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| Institution: | 1. Swedish University of Agricultural Sciences, Department of Ecology, P.O. Box 7044, SE-750 07 Uppsala, Sweden;2. School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden;1. Dipartimento di Ingegneria dell’informazione, Ingegneria elettrica e Matematica Applicata (DIEM), Via Giovanni Paolo II 132, I-84084 Fisciano (SA), Italy;2. Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Napoli, Gruppo Collegato di Salerno, Italy;3. Dipartimento di Ingegneria Industriale (DIIN), Università degli Studi di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano (SA), Italy;4. Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Unitá di Salerno, Italy;5. Dipartimento di Studi e Ricerche Aziendali (Managment & Information Technology) (DISTRA), Via Giovanni Paolo II 132, I-84084 Fisciano (SA), Italy;1. Australian Institute of Marine Science, Townsville, Australia;2. School of Biological Science, University of Western Australia, Australia;3. Oceans Institute, University of Western Australia, Australia;1. Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal;2. Department of Biology, Mt. Allison University, Sackville, New Brunswick, E4L1G7, Canada;1. School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, PR China;2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, PR China;3. Department of Biological and Health Sciences, Texas A&M University-Kingsville, Kingsville, TX 78363, USA;1. USP, ESALQ, Forest Science Department, 13418-900 Piracicaba, Brazil;2. Eco&Sols, INRA, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, Montpellier, France;3. CIRAD, UMR Eco&Sols, F-34398 Montpellier, France;4. UNESP, School of Agriculture, São Paulo State University ‘Julio de Mesquita Filho,’ Botucatu 18610-300, Brazil;5. Department of Forest Science and Wood, UFES, 29550-000 Jeronimo Monteiro, Brazil;6. IPEF, Instituto de Pesquisas e Estudos Florestais, 13415-000 Piracicaba, Brazil |
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| Abstract: | The decomposition rate of litter mixtures can differ from that expected on the basis of the decomposition rate of the individual components. This difference may be linked to nitrogen (N) transfer from high-N to low-N components. Transfer of N is probably also associated with transfer of C, but the extent and direction of this C transfer are unknown. This study examined transfer and loss in laboratory microcosms of C and N from two mixed litter species (Scots pine, Pinus sylvestris L. and maize, Zea mays L.), which have natural isotopic differences in 13C. Half the material was 15N-labelled and the plants were fertilised or unfertilised. Substantial bidirectional transfer of C and N occurred between the litters, with net transfer of C from pine to maize litter and net transfer of N from high-N to low-N litter. Mixtures of fertilised and unfertilised plant litter showed higher than expected C losses and net transfer of N. Mixtures with litters from the same fertilisation treatment had small or insignificant net transfer of N and their C losses did not differ from values estimated using the decomposition rates of the pure litters. |
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