High soil moisture rather than drying-rewetting cycles reduces the effectiveness of nitrification inhibitors in mitigating N2O emissions

IF 5.1 1区农林科学 Q1 SOIL SCIENCE Biology and Fertility of Soils Pub Date : 2024-03-15 DOI:10.1007/s00374-024-01811-2

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Abstract

Climate change has been intensifying soil drying and rewetting cycles, which can alter the soil microbiome structure and activity. Here we hypothesized that a soil drying-rewetting cycle enhances biodegradation and, hence, decreases the effectiveness of nitrification inhibitors (NIs). The effectiveness of DMPP (3,4-Dimethylpyrazole phosphate) and MP + TZ (3-Methylpyrazol and Triazol) was evaluated in 60-day incubation studies under a drying and rewetting cycle relative to constant low and high soil moisture conditions (40% and 80% water-holding capacity, WHC, respectively) in two different textured soils. The measurements included (i) daily and cumulative N₂O-N emissions, (ii) soil NH₄⁺-N and NO₃⁻-N concentrations, and (iii) the composition of bacterial soil communities. Application of DMPP and MP + TZ reduced the overall N₂O-N emissions under drying-rewetting (-45%), as well as under 40% WHC (-39%) and 80% WHC (-25%). DMPP retarded nitrification and decreased N₂O-N release from the sandy and silt loam soils, while MP + TZ mitigated N₂O-N production only from the silt loam soil. Unexpectedly, between days 30 and 60, N₂O-N emissions from NI-treated soils increased by up to fivefold relative to the No-NI treatment in the silt loam soil at 80% WHC. Likewise, the relative abundance of the studied nitrifying bacteria indicated that the NIs had only short-term effectiveness in the silt loam soil. These results suggested that DMPP and MP + TZ might trigger high N₂O-N release from fine-textured soil with constant high moisture after this short-term inhibitory effect. In conclusion, DMPP and MP + TZ effectively reduce N₂O-N emissions under soil drying and rewetting.

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土壤湿度高而不是干燥-润湿循环会降低硝化抑制剂在减少一氧化二氮排放方面的效果

摘要气候变化加剧了土壤干燥和复湿周期，这会改变土壤微生物群的结构和活性。在此，我们假设土壤干燥-复湿周期会增强生物降解，从而降低硝化抑制剂（NIs）的有效性。在两种不同质地的土壤中，相对于恒定的低湿度和高湿度土壤条件（分别为 40% 和 80% 的持水量，WHC），在干燥和复湿循环下进行了为期 60 天的培养研究，评估了 DMPP（3,4-二甲基吡唑磷酸盐）和 MP + TZ（3-甲基吡唑和三唑醇）的有效性。测量内容包括：(i) N2O-N 的日排放量和累计排放量；(ii) 土壤中 NH4+-N 和 NO3-N 的浓度；(iii) 土壤细菌群落的组成。施用 DMPP 和 MP + TZ 可减少干燥-润湿条件下（-45%）、40% WHC 条件下（-39%）和 80% WHC 条件下（-25%）的总体 N2O-N 排放量。DMPP 可延缓硝化作用，减少沙土和淤泥质壤土中的 N2O-N 释放量，而 MP + TZ 只减轻了淤泥质壤土中的 N2O-N 产生量。意想不到的是，在 80% WHC 条件下，NI 处理土壤的 N2O-N 排放量在第 30 到 60 天之间比无 NI 处理的淤泥质壤土增加了五倍。同样，所研究的硝化细菌的相对丰度表明，NIs 在淤泥质壤土中只有短期效果。这些结果表明，DMPP 和 MP + TZ 在产生短期抑制作用后，可能会促使持续高湿的细粒土壤释放大量 N2O-N。总之，DMPP 和 MP + TZ 能有效减少土壤干燥和复湿条件下的 N2O-N 排放。

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来源期刊

Biology and Fertility of Soils 农林科学-土壤科学

CiteScore

11.80

自引率

10.80%

发文量

审稿时长

2.2 months

期刊介绍： Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.