Potassium chloride (KCl) and magnesium chloride (MgCl₂) can be used to reduce carbon dioxide (CO₂) and nitrous oxide (N₂O) emissions, but their efficacy can be strongly affected by their Cl⁻ concentration. This study aimed to compare the behaviour of different Cl⁻ salts and concentrations with that of a typical commercial nitrification inhibitor (3, 4-dimethylpyrazole phosphate, PIADIN). KCl, MgCl₂ and PIADIN were investigated under a laboratory incubation experiment for two months. KCl and MgCl₂ were applied at 0.5 and 1.0 g kg⁻¹, while PIADIN was applied at 25 mg kg⁻¹ soil. CO₂ and N₂O concentrations were analysed during the incubation period. The ${\text{NH}}_4^{+}$ and ${\text{NO}}_3^{-}$ dynamics in soil were also measured. The results showed 0.5 and 1.0 g kg⁻¹ KCl and 0.5 g kg⁻¹ MgCl₂ decreased CO₂-C emissions by 43%–46% and increased N₂O-N emissions by 15%–48%, whereas 1.0 g kg⁻¹ MgCl₂ decreased CO₂-C emissions by 72% and N₂O-N emissions by 19%. KCl and MgCl₂ retarded the decrease of the ${\text{NH}}_4^{+}$-N concentration and increase of the ${\text{NO}}_3^{-}$-N concentration. PIADIN reduced the emissions of CO₂-C by 113% and N₂O-N by 97% and maintained a high soil ${\text{NH}}_4^{+}$-N concentration and low ${\text{NO}}_3^{-}$-N concentration. MgCl₂ addition at 1.0 g kg⁻¹ was an effective treatment as the Mg both fertilized the soil and inhibited CO₂-C and N₂O-N emissions. Moreover, 1.0 g kg⁻¹ MgCl₂ could retard soil nitrification, the decrease of ${\text{NH}}_4^{+}$-N concentration and the increase of ${\text{NO}}_3^{-}$-N concentration. While PIADIN had no fertilizing value, it was a more effective nitrification inhibitor than Cl⁻ salts.

中文翻译：

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受控环境下不同氯化物盐及其浓度对沙质土壤硝化作用和微量气体排放的影响

氯化钾 (KCl) 和氯化镁 (MgCl ₂ ) 可用于减少二氧化碳 (CO ₂ ) 和一氧化二氮 (N ₂ O) 的排放，但它们的功效会受到其 Cl ^-浓度的强烈影响。本研究旨在比较不同 Cl ^-盐和浓度的行为与典型商业硝化抑制剂（3, 4-二甲基吡唑磷酸盐，PIADIN）的行为。KCl、MgCl ₂和 PIADIN 在实验室孵化实验下进行了两个月的研究。KCl 和 MgCl ₂以 0.5 和 1.0 g kg ^-1施用，而 PIADIN 以 25 mg kg ^-1土壤施用。二氧化碳₂和 N ₂ O 浓度在孵育期间进行分析。这${\text{NH}}_4^{+}$和${\text{不}}_3^{-}$还测量了土壤中的动态。结果表明，0.5 和 1.0 g kg ^-1 KCl 和 0.5 g kg ^-1 MgCl ₂使 CO ₂ -C 排放量减少了 43%–46%，N ₂ O-N 排放量增加了 15%–48%，而 1.0 g kg ^-1 MgCl ₂减少了 72% 的CO _{2 -C 排放和 19% 的 N 2} O-N 排放。KCl 和 MgCl ₂延缓了${\text{NH}}_4^{+}$-N 浓度和增加${\text{不}}_3^{-}$-N 浓度。PIADIN 减少了113%的 CO _{2 -C 和 97% 的 N 2} O-N 排放，并保持了高土壤${\text{NH}}_4^{+}$-N浓度低${\text{不}}_3^{-}$-N 浓度。添加 1.0 g kg ^-1的MgCl ₂是一种有效的处理方法，因为 Mg 既能施肥土壤又能抑制 CO ₂ -C 和 N ₂ O-N 排放。此外，1.0 g kg ^-1 MgCl ₂可以延缓土壤硝化作用，减少${\text{NH}}_4^{+}$-N 浓度和增加${\text{不}}_3^{-}$-N 浓度。虽然 PIADIN 没有施肥价值，但它是一种比 Cl ^-盐更有效的硝化抑制剂。