Decomposition of senescent leaves of signalgrass ( Urochloa decumbens Stapf. R. Webster) and arboreal legumes in silvopa
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Decomposition of senescent leaves of signalgrass (Urochloa decumbens Stapf. R. Webster) and arboreal legumes in silvopastoral systems Ana Marı´a Herrera . Alexandre Carneiro Lea˜o de Mello . Vale´ria Xavier de Oliveira Apolina´rio . Jose´ Carlos Batista Dubeux Ju´nior . Valdson Jose´ da Silva . Me´rcia Virginia Ferreira dos Santos . Ma´rcio Vieira da Cunha
Received: 21 July 2020 / Accepted: 18 September 2020 Ó Springer Nature B.V. 2020
Abstract The presence of arboreal legumes in silvopastoral systems (SPS) may affect litter production and quality, and the characteristics and distribution of soil organic matter (OM). Senescent leaves from two tree legumes [Gliricidia sepium (Jacq.) Kunth ex. Walp. (Gliricidia) and Mimosa caesalpiniifolia Benth. (Sabia)] in SPS with Urochloa decumbens Stapf. R. Webster (signalgrass), and from signalgrass pasture in monoculture (Signalgrass), were collected when still attached to the plant and incubated on the ground during 0, 4, 8, 16, 32, 64, 128, and
Alexandre Carneiro Lea˜o de Mello and Me´rcia Virginia Ferreira dos Santos: CNPq Fellow. A. M. Herrera Agricultural Research Department, Universidad Nacional Experimental del Ta´chira, Universidad Avenue, San Cristo´bal 5001, Ta´chira, Venezuela A. C. L. de Mello (&) V. J. da Silva M. V. F. dos Santos M. V. da Cunha Animal Science Department, Universidade Federal Rural de Pernambuco. Dois Irma˜os, Recife, PE 52171-900, Brazil e-mail: [email protected] V. X. O. Apolina´rio Associate Professor I, Universidade Estadual Do Maranha˜o, Sa˜o Luı´s, MA, Brazil
256 days. Response variables included the disappearance of dry matter (DM), OM, C, N, lignin, acid detergent insoluble nitrogen, and C:N and lignin:N ratio. Single negative exponential models were adjusted to estimate the relative decomposition rate (k). The decomposition rate (k) of DM, OM, and C was greater for Gliricidia and Signalgrass (P \ 0.05) compared to Sabia, incorporating 801 g kg DMtotal-1, 850 g kg OMtotal-1, and between 840 and 860 g kg Ctotal-1. Gliricidia showed greater N release rate compared to Sabia and Signalgrass, with an estimated disappearance of 23, 4, and 6 mg N g DM–1 for Gliricidia, Sabia, and Signalgrass, respectively. Tree legumes showed lesser k for C:N ratio and greater for lignin concentration (P \ 0.05). Gliricidia had greater release of nutrients to the soil, while Sabia had slower decomposition rates, but with the potential to form a more stable OM because of more recalcitrant compounds left behind. The k of Signalgrass was limited by the lesser N concentration and high C:N ratio in the litter, contributing to immobilization of N during litter decomposition. Keywords Gliricidia sepium (Jacq.) Kunth ex. Walp. Mimosa caesalpiniifolia Benth. Litter decomposition rate Remanescent C
J. C. B. Dubeux Ju´nior North Florida Research & Education Center, University of Florida, Marianna, FL, USA
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Agroforest Syst
Introduction Silvopastoral systems (SPS) are a type of agroforestry system
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