Shift in C and N humification during legume litter decomposition in an acid tropical Ferralsol
Jorge Sierra A C and Natacha Motisi B
+ Author Affiliations
- Author Affiliations
A INRA, UR1321 ASTRO Agrosystèmes Tropicaux, Petit-Bourg, F-97170, Guadeloupe, France.
B CIRAD, UPR URSIA Systèmes et Ingénierie Agronomique, Montpellier, F-34398, France; and Délégation du Cirad, Yaoundé, Cameroon.
C Corresponding author. Email: jorge.sierra@antilles.inra.fr
Soil Research 50(5) 380-389 https://doi.org/10.1071/SR12101
Submitted: 17 April 2012 Accepted: 18 June 2012 Published: 6 July 2012
Abstract
Several long-term studies on tropical soils have shown that legume residue incorporation increases soil nitrogen (N) sequestration more than that of carbon (C), resulting in a fall in the C/N ratio. This study was designed to assess the short-term effect of legume litter addition on N supply and the long-term effect on soil organic matter (SOM) formation and soil C/N decrease. The long-term effect was evaluated in a 2-year mesocosm experiment with high and frequent organic inputs from two types of legume litter with different C/N ratios, using stable isotope techniques. The short-term effect of litter was analysed using four different litters in 3-month laboratory incubations. A model of litter decomposition was used to describe C and N kinetics in the laboratory experiment and to verify whether the long-term effect of litter may be predicted from short-term incubations. The results of the mesocosm experiment confirmed that legume inputs increased soil organic N (mean +21%) more than organic C (mean +15%) (P = 0.05). Although no differences between litters were observed for C dynamics, N sequestration (14% and 28%) and the final soil C/N (12.0 and 10.8) varied with litter C/N (34.4 and 16.1, respectively). The laboratory experiment and model outputs confirmed these findings and indicated that the higher N sequestration was due to a change in the parameters describing humification of C and N coming from litter. This change depended on litter quality and was greater for litters with low C/N—C humification 0.66 g C g–1 C and N humification 0.76 g N g–1 N for litter C/N 16.1. Carbon and N sequestration were greater in the laboratory experiment, due to a higher mineralisation of the new SOM derived from litter in the mesocosm experiment—32% and 15% for the mesocosm and the laboratory experiments, respectively. Our results indicated that the decrease in soil C/N and the rapid mineralisation of new SOM should be considered in models of litter decomposition to respond correctly to the long- and the short-term effects of legume litter inputs in tropical soils.
Additional keywords: Canavalia ensiformis, C/N ratio, decomposition model, Gliricidia sepium, soil organic matter.
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