Impacts of land use and topography on soil organic carbon in a Mediterranean landscape (north-western Tunisia)

Jendoubi, Donia; Liniger, Hanspeter; Ifejika Speranza, Chinwe (2019). Impacts of land use and topography on soil organic carbon in a Mediterranean landscape (north-western Tunisia). SOIL, 5(2), pp. 239-251. Copernicus 10.5194/soil-5-239-2019

[img]
Preview
Text (Impacts of land use and topography on soil organic carbon in a Mediterranean landscape (north-western Tunisia))
Jendoubi_2019_soil.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (2MB) | Preview

This study evaluates the impact of land use and topographic features (slope and aspect) on soil or-ganic carbon (SOC) within the Wadi Beja watershed in north-western Tunisia. A soil spectral library was set upto assess the variation in the SOC for 1440 soil samples from four land use types (field crops, permanent crops,forest, and grazing land), three slope categories (flat, moderate, and steep) and two aspects (north- and south-facing). For field crops, only one factor – slope – significantly affected SOC, with SOC content in north-facingareas appearing to be higher in flat areas (0.75 %) than in hilly areas (0.51 %). However, in south-facing areas,SOC content was also higher in flat areas (0.74 %) than in hilly areas (0.50 %). For permanent crops, whichwere inter-planted with field crops, the slope significantly affected SOC content, which improved to 0.97 % inflat north-facing and 0.96 % in flat south-facing areas, scoring higher than hilly south- and north-facing areas(0.79 %). In the grazing land use system, both of the investigated factors – aspect and slope – significantly af-fected the SOC content, which was significantly higher in flat areas (north-facing: 0.84 %, south-facing: 0.77 %)than in hilly areas (north-facing: 0.61 %, south-facing: 0.56 %). For the forest, none of the factors had a significanteffect on SOC content, which was higher in flat areas (north-facing: 1.15 %, south-facing: 1.14 %) than in steepareas (1.09 % in north-facing areas and 1.07 % in south-facing areas). This study highlights the ability of visibleand near-infrared (VNIR) spectroscopy to quantify C in diverse soils collected over a large diverse geographicarea in order to indicate that calibrations are feasible, and therefore, assessing the variation of SOC content underland use and topographic features (slope and aspect) will result in better sustainable land management planning.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Geographies of Sustainability > Unit Land Systems and Sustainable Land Management (LS-SLM)
08 Faculty of Science > Institute of Geography > Geographies of Sustainability
08 Faculty of Science > Institute of Geography
10 Strategic Research Centers > Centre for Development and Environment (CDE)

Graduate School:

International Graduate School North-South (IGS North-South)

UniBE Contributor:

Jendoubi, Donia; Liniger, Hanspeter and Ifejika Speranza, Chinwe

ISSN:

2199-398X

Publisher:

Copernicus

Projects:

[427] World Overview of Conservation Approaches and Technologies Official URL
[803] Cluster: Land Resources

Language:

English

Submitter:

Stephan Schmidt

Date Deposited:

06 Mar 2020 13:52

Last Modified:

08 Mar 2020 02:50

Publisher DOI:

10.5194/soil-5-239-2019

BORIS DOI:

10.7892/boris.140668

URI:

https://boris.unibe.ch/id/eprint/140668

Actions (login required)

Edit item Edit item
Provide Feedback