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000202909 1001_ $$0P:(DE-HGF)0$$aPanettieri, M.$$b0$$eCorresponding author
000202909 245__ $$aEvaluation of seasonal variability of soil biogeochemical properties in aggregate-size fractioned soil under different tillages
000202909 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2015
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000202909 520__ $$aAn augment of soil organic matter (SUM) in agricultural lands is mandatory to improve soil quality and fertility and to limit greenhouse gases emissions. A better protection of SUM from degradation is seconded to its inclusion in aggregates and to the formation of organo-mineral interactions with the clay fraction within the soil matrix. Under Mediterranean conditions, conservation agriculture (CA) has been widely related with macro-aggregates formation, SUM protection, and to an improvement of soil fertility and crop yields. The objective of this work was to evaluate the biogeochemical properties of five aggregate-size fractions obtained by dry sieving of a Calcic Fluvisol of an experimental farm managed under three different tillages. Soil aggregates distribution, total organic carbon (TUC), labile carbon pools, and enzymatic activities were measured in 2 different periods of the same agricultural campaign. CPMAS C-13 NMR analyses were also performed to elucidate the structure of preserved SOM. The results evidenced seasonal variability in aggregate distribution, labile carbon pools and dehydrogenase activity (DHA), whereas TOC, permanganate oxidizable carbon (POxC), and p-glucosidase activity demonstrated to be reliable soil quality indices for soil fractions. The NMR analyses showed a better SUM preservation under conservation tillages, due to higher plant litter inputs and/or higher amount of necromass derived compounds if compared with traditional tillage. Particularly interesting are the results of the circle divide 0.5-1 mm fraction, in which different trends were found for beta-Glu and several organic compound classes if compared with the other fractions. Possibly, in this fraction are concentrated most of the products from cellulose depolymerization stabilized by organo-mineral interactions. (C) 2015 Elsevier B.V. All rights reserved.
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000202909 7001_ $$0P:(DE-Juel1)129438$$aBerns, A. E.$$b1$$ufzj
000202909 7001_ $$0P:(DE-HGF)0$$aKnicker, H.$$b2
000202909 7001_ $$0P:(DE-HGF)0$$aMurillo, J. M.$$b3
000202909 7001_ $$0P:(DE-HGF)0$$aMadejón, E.$$b4
000202909 773__ $$0PERI:(DE-600)1498737-5$$a10.1016/j.still.2015.02.008$$gVol. 151, p. 39 - 49$$p39 - 49$$tSoil & tillage research$$v151$$x0167-1987$$y2015
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