MCV6YDRV

2786

15 janvier 2021 23:33

15 janvier 2021 23:33

Although tillage is key in the control of soil CO2 emissions, data on its impact under Tunisian conditions are still lacking. A field study was carried out to evaluate the effects of various tillage systems on CO2 emission and on the structural changes of a sandy loam soil in the Sousse region in Central East Tunisia. There were four tillage treatments: no tillage (NT), shallow tillage (9 cm, ST), medium tillage (14 cm, MT), and deep tillage (25 cm, DT) established in a randomized block design. Treatments were replicated three times and the plots were 60 m2 (20 m × 3 m). The CO2 flux was measured after tillage using non-through-flow steady state chambers and bulk density (BD) was determined by the volumetric cylinder method. Under each tillage treatment, carbon dioxide emissions and soil BD were monitored for a period of 40 days. The greatest CO2 emissions occurred in the first 24 h after tillage and increased in the order NT (109 mg cm−2 h−1) < ST (113.97 mg cm−2 h−1) < MT (124.55 mg cm−2 h−1) < DT (136.08 mg cm−2 h−1). The BD decreased with increased tillage, e.g., NT (1.646 g cm−3) > DT (1.18 g cm−3). There was a significant negative correlation between CO2 emissions and BD (r = − 0.6; P < 0.01), showing that no tillage is an effective mitigation measure against carbon dioxide emission in the semiarid conditions.

None

• AB - Utile à l'AB
• FREDO biologie et travail du sol
• FREDO environnement
• GEO Tunisie
• GEO méditérannée
• greenhouse gas emission
• soil

Euro-Mediterranean Journal for Environmental Integration

6

16

2021-01-05

5 janvier 2021

10.1007/s41207-020-00229-0 Le DOI est une URL unique de référencement d'une publication. Il est donc plus fiable et permanent qu'une URL classique

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