Temperature Sensitivity of Nitrogen Dynamics of Agricultural Soils of the United States

• 作者: Alexsandro Felipe de Jesus Amitava Chatterjee Bhupinder S. Farmaha Daniel S. Long Diksha Goyal Lakesh Sharma Larry J. Cihacek Sailesh Sigdel Sindhu Jagadamma
• 来源期刊: 土壤科学期刊(英文)
• 学科: 农学
• 关键词: Arrhenius Equation Soil Organic Carbon Inorganic Nitrogen Gaseous Losses of Nitrogen
• 年，卷（期）: 2020,（7）
• 页码范围: 298-305
• 页数: 8页
• 分类号: S15

摘要

Soil temperature controls gaseous nitrogen losses through nitrous oxide (N₂O) and ammonia (NH₃) fluxes. Eight surface soils from agricultural fields across the United States were incubated at 10<span style="white-space:nowrap;">°</span>C, 20<span style="white-space:nowrap;">°</span>C, and 30<span style="white-space:nowrap;">°</span>C, and N₂O and NH₃ flux were measured twice a week for 91 and 47 d, respectively. Changes in cumulative N₂O and NH₃ flux and net N mineralization at three temperatures were fitted to calculate Q₁₀ using the Arrhenius equation. For the majority of soils, Q₁₀ values for the N₂O loss ranged between 0.23 and 2.14, except for Blackville, North Carolina (11.4) and Jackson, Tennessee (10.1). For NH₃ flux, Q₁₀ values ranged from 0.63 (Frenchville, Maine) to 1.24 (North Bend, Nebraska). Net soil N mineralization-Q₁₀ ranged from 0.96 to 1.00. Distribution of soil organic carbon and total soil N can explain the variability of Q₁₀ for N₂O loss. Understanding the Q₁₀ variability of soil N dynamics will help us to predict the N loss.