Soil organic matter fractions and carbon management index under integrated crop-livestock system

Abstract

The objective of this work was to evaluate the carbon content of the physical, chemical and oxidizable fractions of soil organic matter (SOM) and to calculate the carbon management index (CMI) in an area managed under an integrated crop-livestock system (ICLS) in the western region of Paraná - Brazil. The experiment was carried out at the experimental farm, belonging to the Universidade Estadual do Oeste do Paraná. Seventeen areas, which are managed in different ways, fifteen in ICLS and two areas of controls (Forest and Haymaking), using the design divided with two nested controls, with three replications were evaluated. Deformed and undisturbed soil samples were collected from all the areas to determine the total organic carbon (TOC), carbon stock, the physical, chemical and oxidizable fractions of SOM and the CMI in the layers of 0-0.05, 0.05-0.1 and 0.1-0.2 m. Little significant changes in the fractions were found for the management of the ICLS area in relation to the Forest and the area of Haymaking, although the Forest presented the best values for most of the studied fractions. It is recommended to adopt sustainable practices, such as ICLS, even though the average fractions tend to take time to match reference areas.

Chemical Properties and Physical Fractions of Organic Matter in Oxisols Under Integrated Agricultural Production Systems

“…High COP values indicate continuous deposition of crop residues; however, low MOC in RNAN indicates loss of carbon associated with mineral particles. Rossi et al (2012b) and Piano et al (2020) also obtained higher POCst and lower MOCst as a result of increased L and IL, ultimately increasing CSI, which is consistent with our results.…”

“…These results may be related to the deposition and accumulation of residues, of both animal and plant origin, combined with climatic factors, all of which can lead to decomposition through the activity of soil microbes. The resultant formation of free ions in soil alters the contents of various nutrients (Flores et al, 2008;Costa et al, 2015;Mattei et al, 2018;Piano et al, 2020).…”

Carbon Management Index and Soil Organic Carbon pools of Different land use in Uttarakhand, Western Himalaya

“…Native vegetation shows maximum TOC and tends to decrease depth wise. 14 Also, several factors significantly affects the carbon dynamics of any system. 15 This study documented higher TOC in mixed forest that further effectively enhances the soil carbon storage.…”

Humic substances and oxidable fractions of organic matter in different environments in Amazônia Maranhense

“…The intensi cation of land use and management carried out in a way that does not consider the suitability of the space has contributed to the intensi cation of the degradation process in many areas, due to the non-maintenance of sustainability. The variation in the accumulation of soil organic matter (SOM), as well as the forms in which the organic matter is found in the soil, can work as an indicator of quality, due to the sensitivity of the SOM content to changes in an area subjected to a certain management system (Rosset et al 2016, Moraes Rego et al 2020.…”

“…The evaluation of the dynamics and stability of SOM can be done through fractionation techniques, including chemical (Swift 1996) and oxidizable (Chan et al 2001), which are important and sensitive tools capable of detecting changes associated with different forms of use and/or management of the soil and plant species used (Piano et al 2020).…”