Short-Term Inventory of GHG Fluxes in Semi-Natural and Anthropogenized Grassland
Ligita Balezentiene, Rolandas Bleizgys
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Lithuanian University of Agriculture, Studentu 11, LT-53361 Akademija, Kauno R., Lithuania
Pol. J. Environ. Stud. 2011;20(2):255-262
Climate change accelerates global warming and has thus become an increasing concern with need for prompt solutions. This process occurs due to increased atmospheric green house gas (GHG) emissions. The agro sector (crop and livestock agriculture) contributes 10 to 12% per year of the total global anthropogenic emission and tends to increase. Most agricultural GHG emissions are generated by intensively fertilized soils, enteric fermentation, and manure management. Remarkable GHG fluxes occurred from grasslands which occupy 69% of global agricultural land. The aim of this investigation was to evaluate and estimate GHG emissions in natural and abandoned grassland improved by managed fertilizing. Experimental data sets cover grassland (clay loam topsoil over silt loam, Calc(ar)i-Endohypogleyic Luvisol) abandoned more than 20 years, which has subsequently been fertilized with different rates of N and multiple NPK. Direct CO2, N2O, and CH4 emissions were measured in differently studied treatments (semi-natural sward: Control (0), N60, N120, N180, N240, N180P120, N180K150, N60P40K50, and N180P120K150; cultural pasture: N180P120K150) during vegetation period (2009). Decreasing tendency of emission fluxes was determined during vegetation period and employing lower fertilizer rates. Therefore, appropriate fertilizing rate (N60P40K50) of extensive grassland should be considered for its mitigating impact on climate change.
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