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Decomposition and nutrient release in leaves of Atlantic Rainforest tree species used in agroforestry systems |
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| Authors: | Edivânia M G Duarte Irene M Cardoso Thomas Stijnen Maria Alice F C Mendonça Marino S Coelho Reinaldo B Cantarutti Thomas W Kuyper Ecila M A Villani Eduardo S Mendonça |
| Institution: | 1. Soil Science Department, Federal University of Vi?osa, Avenida P. H. Rolfs, s/n, Vi?osa, Minas Gerais, 36570-000, Brazil 2. Federal Institute of Education, Science and Technology Campus Muriaé, Avenida Monteiro de Castro, 550-Bairro Barra, Muriaé, Minas Gerais, 36880-000, Brazil 3. Department of Soil Quality, Wageningen University, PO Box 47, 6700 AA, Wageningen, The Netherlands 4. Federal University of Rio, Grande Do Sul Av Paulo Gama, 110, Bairro Farroupilha, Porto Alegre, Rio Grande do Sul, 90040-060, Brazil 5. Federal University of Espírito Santo, Alto Universitário, s/no, PO Box 16, Guararema, Alegre, Espírito Santo, 29500-000, Brazil |
| Abstract: | Aiming to support the use of native species from the Atlantic Rainforest in local agroforestry systems, we analysed chemical and biochemical components related to leaf decomposition of Inga subnuda, Senna macranthera, Erythrina verna, Luehea grandiflora, Zeyheria tuberculosa, Aegiphila sellowiana, and Persea americana. These tree species are native (except for P. americana) and commonly used in agroforestry systems in the Atlantic Rainforest. For the three first species (Fabaceae), we also analysed the remaining dry matter and released nutrients from leaves, using litter bags, and biological nitrogen fixation, using Bidens pilosa and Brachiaria plantaginea as references of non-N2-fixing plants. Leaves from I. subnuda, L. grandiflora, and P. americana had a lower decomposition rate than the other species, exhibiting negative correlations with lignin/N and (lignin+polyphenol)/N ratios. The percentages of remaining dry matter after 1 year were 69 % (I. subnuda), 26 % (S. macranthera) and 16 % (E. verna). Higher nutrient release was found in decreasing order from residues of E. verna, S. macranthera, and I. subnuda. The percentages of nitrogen fixation were 22.6 % (E. verna), 20.6 % (I. subnuda) and 16.6 % (S. macranthera). Diversification of tree species in agroforestry systems allows for input of diversified organic material and can contribute to maintaining and improving soil functions resulting in improvements of soil quality. |
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