Saline–Sodic Soils: Potential Sources of Nitrous Oxide and Carbon Dioxide Emissions?

摘要: Increasing salt–affected agricultural land due to low precipitation, high surface evaporation, irrigation with saline water, and poor cultural practices has triggered the interest understand influence of salt on nitrous oxide (N2O) carbon dioxide (CO2) emissions from soil. Three soils varying electrical conductivity saturated paste extract (ECe) (0.44–7.20 dS m−1) sodium adsorption ratio (SARe) (1.0–27.7), two saline–sodic (S2 S3) a non–saline, non–sodic soil (S1), were incubated at moisture levels 40%, 60%, 80% water–filled pore space (WFPS) for 30 d, or without nitrogen (N) fertilizer addition (urea 525 µg g−1 soil). Evolving CO2 N2O estimated by analyzing collected gas samples during incubation period. Across all N levels, cumulative increased significantly 39.8% 42.4% in S2 S3, respectively, compared S1. The emission three did not differ as result complex interactions salinity sodicity. Moisture had no significant effect emissions, but an increase moisture. Addition emissions. These showed that can be contributor environment soils. application fertilizer, irrigation, precipitation may potentially greenhouse (N2O CO2) releases