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Accueil du site → Doctorat → Espagne → 2015 → No laboreo en agrosistemas de secano en Aragón : efectos a largo plazo en el almacenamiento de carbono orgánico y en la estructura del suelo

Universidad de Zaragoza (2015)

No laboreo en agrosistemas de secano en Aragón : efectos a largo plazo en el almacenamiento de carbono orgánico y en la estructura del suelo

Blanco-Moure, Nuria

Titre : No laboreo en agrosistemas de secano en Aragón : efectos a largo plazo en el almacenamiento de carbono orgánico y en la estructura del suelo

Auteur : Blanco-Moure, Nuria

Université de soutenance : Universidad de Zaragoza

Grade : Doctoral Tesis 2015

Résumé
The main objective of this PhD Thesis has been to assess the capacity of NT-based cropping systems to accumulate and stabilize OC and improve the physical condition of the soil in different cereal production areas of Aragon. In a first step, a study of localization and characterization of commercial fields of NT showed the diversity of management practices used by farmers in their fields (different crop residue management, cropping system and rotation, manure application, etc.), reflecting the reality of the conservation agriculture in Aragon. In order to deepen the overall goal of the thesis, a second selection of six study sites was made where pairs of adjacent soils under NT and conventional tillage (CT) were compared. In all sites, a nearby undisturbed soil under native vegetation (NAT) was included. The results showed that the OC content in the first 20 cm of soil was, on average, 20% higher under NT than under CT. The highest contents were obtained in the NT fields of longer duration and/or managed with practices that enhance the return of more crop biomass to the soil. However, this gain was reduced or inverted in the deeper soil layers so that, taking into account the whole soil profile (0-40 cm), the potential of NT to store OC was similar or only slightly higher than that of CT.

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