Changes in the soil inorganic carbon dynamics in the tilled layer of a semi-arid Mediterranean soil due to irrigation and a change in crop

Uncertainties in the calculation of pedogenic carbonates

verfasst von

Isabel S. De Soto, Pierre Barré, Kazem Zamanian, Henar Urmeneta, Rodrigo Antón, Alberto Enrique, Iñigo Virto

Abstract

Soil inorganic carbon (SIC) accounts for more than one-third of the total soil carbon pool, but the effect of agricultural management on carbonates dynamics in Mediterranean semi-arid calcareous soils has largely been ignored and remains unclear. However, SIC plays a key role in physical, chemical and, biological properties of soils, which in turn can affect plant growth and productivity. Based on a 7-year field experiment in a paired irrigated and non-irrigated trial, with two different crops (maize and wheat), we investigated the effects of the land use change (from non-irrigated wheat to irrigated maize) on the SIC dynamics in the topsoil (0–30 cm) of a carbonate-rich soil in Navarre, northern Spain. The results obtained using the accepted equation for determining carbonate type showed that during the 7-year study period, irrigation application and the crop change modified the carbonate typology (lithogenic and pedogenic) in a very short period, without affecting the total SIC content. The main drivers of pedogenic carbonate formation in this case appear to be the water volume and the type of organic matter entering the soil (from C3 plants or C4 plants). However, the equation seems to be strongly dependent on the type of soil organic carbon, which can introduce uncertainties when used to determine the proportion of pedogenic carbonates in soils experiencing a crop change from C3 to C4 plants.

Organisationseinheit(en)

Institut für Erdsystemwissenschaften

Externe Organisation(en)

Universidad Pública de Navarra (UPNA)
École normale supérieure (Paris)

Typ

Artikel

Journal

CATENA

Band

246

Anzahl der Seiten

11

ISSN

0341-8162

Publikationsdatum

11.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Erdoberflächenprozesse

Ziele für nachhaltige Entwicklung

SDG 2 – Kein Hunger, SDG 15 – Lebensraum Land

Elektronische Version(en)

https://doi.org/10.1016/j.catena.2024.108362 (Zugang: Offen)