Naslov
Tillage induced CO2 emissions in relation to soil parameters

Autori
Bilandžija, Darija ; Zgorelec, Željka ; Kisić, Ivica

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Soil and Crop Management: Adaptation and Mitigation of Climate Change / Vukadinović, Vesna ; Đurđević, Boris - Osijek : Grafika Osijek, 2013, 201-208

ISBN
978-953-7871-10-9

Skup
2nd CROSTRO International Scientific Conference "Soil and Crop Management: Adaptation and Mitigation of Climate Change"

Mjesto i datum
Osijek, Hrvatska, 26.09.2013. - 28.09.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
CO2 efflux; tillage; soil temperature; soil moisture; electrical conductivity

Sažetak
Carbon dioxide (CO2) emissions from soil play an important role in the global carbon cycle. Tillage management can increase atmospheric CO2 concentrations and contribute to global warming but it is uncertain to which extent tillage enhances the transfer of soil CO2 to the atmosphere. The objectives of our research were to assess, on six different tillage treatments that have been managed since 1994 as: black fallow - BF, ploughing up and down the slope to 30 cm - PUDS, no-tillage – planting direction up and down the slope – NT, ploughing across the slope to 30 cm – PAS, very deep ploughing across the slope to 50 cm - VDPAS and subsoiling across the slope to 50 cm – SSPAS, the effects of primary tillage (ploughing to 30 cm depth) and secondary tillage (disking and harrowing) on short-term soil CO2 efflux relative to no-tillage (NT) treatment and to determine correlation between soil CO2 efflux and soil parameters (soil temperature, soil moisture and electrical conductivity) on Stagnic Luvisols in Croatia. Soil CO2 concentrations were measured 0, 3 and 6 hours after primary tillage and 1 and 4 hours after secondary tillage by closed static chamber method in September 2012. CO2 effluxes immediately after primary tillage were higher on PAS, VDPAS and SSPAS while lower on BF and PUDS treatments compared to NT treatment. Already 3 and 6 hours after primary tillage, the soil CO2 effluxes were lower on all tilled treatments compared to NT treatment. After secondary tillage, CO2 effluxes were lower on all tilled treatments compared to NT treatment. The highest average soil CO2 efflux after primary tillage was determined at PAS treatment (62, 30 kg ha-1day-1), followed by respectively: SSPAS (61, 35 kg ha-1day-1), VDPAS (48, 98 kg ha-1day-1), PUDS (35, 19 kg ha-1day-1) and BF(16, 65 kg ha-1day-1) treatment while average soil CO2 efflux at NT treatment, amounted 68, 48 kg ha-1day-1. The highest average soil CO2 efflux after secondary tillage was determined at VDPAS treatment (26, 39 kg ha-1day-1), followed by respectively: SSPAS (24, 97 kg ha-1day-1), PAS (15, 69 kg ha-1day-1), PUDS (9, 99 kg ha-1day-1) and BF (8, 56 kg ha-1day-1) treatment while average soil CO2 efflux at NT treatment amounted 59, 21 kg ha-1day-1. CO2 effluxes were very weak negatively correlated with soil temperature (r=0, 12) and soil moisture (r=0, 16) while moderate negatively correlated with electrical conductivity (r=0, 40). Electrical conductivity was weak positively correlated with soil temperature (r=0, 28) and strong positively correlated with soil moisture (r=0, 52) while non correlation was determined between soil temperature and soil moisture (r=0, 01). Our study suggests that tillage had impact on soil CO2 efflux and accelerates the transfer of soil CO2 to the atmosphere but it declined sharply within hours after tillage operations

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA