The effects of soil amendments on soil respiration (SR) rate have not yet been fully evaluated. In the Upper Blue Nile Basin, Ethiopia, we investigated seasonal variations in SR rates between and within soil amendments. We set up 24 plots with 8 treatments—polyacrylamide (PAM), gypsum (G), biochar (B), lime (L), control (C), PAM + L, PAM + G, and PAM + B—in 3 replicates. Soil temperature, moisture, and SR data were collected monthly. Data were evaluated by paired t-test and nonparametric repeated-measures ANOVA. The SR rates were significantly lower (P < 0.05) in PAM + B (3.43 ± 0.55 µmol m⁻² s⁻¹) than in B (4.23 ± 0.61 CO₂ µmol m⁻² s⁻¹) and PAM + L (4.14 ± 0.57 µmol m⁻² s⁻¹). The SR rate differed significantly in all plots between the wet and dry seasons. The relationships between SR rate and soil properties were not significant, although there was a non-significant positive association with soil organic carbon, total nitrogen, soil pH, and clay content. There was a significant (P < 0.01) association between soil moisture and SR in all treatments. PAM + B offers a practical means of enhancing carbon storage efficiency. Comprehensive studies should be conducted in a variety of agroecological settings to determine optimal techniques to reduce SR emissions.

土壤改良剂对土壤呼吸（SR）速率的影响尚未得到充分评估。在埃塞俄比亚青尼罗河上游盆地，我们调查了土壤改良剂之间和土壤改良剂内部 SR 率的季节性变化。我们设置了 24 个小区，进行 8 种处理——聚丙烯酰胺 (PAM)、石膏 (G)、生物炭 (B)、石灰 (L)、对照 (C)、PAM + L、PAM + G 和 PAM + B——共 3 个重复。每月收集土壤温度、湿度和 SR 数据。数据通过配对t检验和非参数重复测量方差分析进行评估。  PAM + B (3.43 ± 0.55 µmol m ⁻²  s ⁻¹ ) 中的SR 率显着低于 ( P < 0.05) B (4.23 ± 0.61 CO ₂ µmol m ⁻²  s ⁻¹ ) 和 PAM + L (4.14 ± 0.57 µmol m ^-2  s ^-1 )。所有样地在雨季和旱季期间的 SR 率均存在显着差异。 SR率与土壤性质之间的关系不显着，尽管与土壤有机碳、全氮、土壤pH和粘土含量存在不显着的正相关。 所有处理中土壤湿度和 SR 之间均存在显着相关性（P < 0.01）。 PAM + B 提供了提高碳储存效率的实用方法。应在各种农业生态环境中进行综合研究，以确定减少 SR 排放的最佳技术。