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Impact of different chloride salts and their concentrations on nitrification and trace gas emissions from a sandy soil under a controlled environment
Soil Use and Management ( IF 5.0 ) Pub Date : 2021-03-03 , DOI: 10.1111/sum.12713
Yafei Guo 1 , Stefan Becker‐Fazekas 1 , K.H. Mühling 1
Affiliation  

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 NH 4 + and 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 NH 4 + -N concentration and increase of the NO 3 - -N concentration. PIADIN reduced the emissions of CO2-C by 113% and N2O-N by 97% and maintained a high soil NH 4 + -N concentration and low 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 NH 4 + -N concentration and the increase of NO 3 - -N concentration. While PIADIN had no fertilizing value, it was a more effective nitrification inhibitor than Cl salts.

中文翻译:

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 NH 4 + 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 NH 4 + -N 浓度和增加 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 NH 4 + -N浓度低 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 NH 4 + -N 浓度和增加 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。
更新日期:2021-03-03
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