Carbon Dioxide and Nitrous Oxide Emissions from Naturally Occurring Sulfate-Based Saline Soils at Different Moisture Contents

摘要: Abstract Soil salinization may negatively affect microbial processes related to carbon dioxide (CO 2 ) and nitrous oxide (N O) emissions. A short-term laboratory incubation experiment was conducted investigate the effects of soil electrical conductivity (EC) moisture content on CO N O emissions from sulfate-based natural saline soils. Three separate 100-m long transects were established along salinity gradient a salt-affected agricultural field at Mooreton, North Dakota, USA. Surface soils collected four equally spaced sampling positions within each transect, depths 0–15 15–30 cm. In laboratory, artificial cores formed combining both in incubated 60% 90% water-filled pore space (WFPS) 25 °C. The measured depth-weighted EC saturated paste extract (ECe) across ranged 0.43 4.65 dS m −1 . Potential nitrogen (N) mineralization rate decreased with increasing e , but relative decline ECe smaller WFPS than WFPS. At WFPS, 133 μg O-N kg 72 = contrast, increased 262 0.81 849 suggesting that linked content. Therefore, spatial variability pattern rainfall over season need be considered when up-scaling landscape scales.