While there is a sound understanding of the range of mechanisms by which biochar can contribute to the mitigation of soil N₂O emissions, a paucity of information remains on the efficacy and mechanisms associated with biochar-based fertilizer (BF). The present 12-month field trial aimed to: (1) investigate the responses of the seasonal variations in soil N₂O emissions and environmental factors, including soil temperature and moisture content, concentrations of NH₄⁺-N, NO₃⁻-N, water-soluble organic N (WSON), microbial biomass N (MBN), water-soluble organic C (WSOC) and microbial biomass C (MBC), and urease and protease activities, to application of BF, chemical fertilizer (CF) and a mixture of BF and CF (BCF) within a Moso bamboo plantation, and (2) reveal contributions of variation in soil properties to change in soil N₂O emissions. The fertilized treatments matched doses of N, P and K among BF, CF and BCF, with an unfertilized treatment as a control. Compared to the control, BF treatment decreased soil N₂O emissions (P < 0.05), whereas treatments of CF and BCF enhanced soil N₂O emissions (P < 0.05). Soil N₂O emissions were predominantly related to the soil temperature (P < 0.01), and correlated with soil WSON concentration and soil urease and protease activities in all fertilized treatments (P < 0.05). In addition, BF treatment markedly (P < 0.05) reduced soil WSON concentration, as well as soil urease and protease activities, whereas the CF and BCF treatments enhanced them (P < 0.05). Results of structural equation modelling indicated that the mechanisms by which BF decreased soil N₂O emissions within the subtropical Moso bamboo plantation was via lowering WSON concentration and N-cycling enzyme activity in soils. In conclusion, results of the present work indicated that BF application could provide an important management strategy for the mitigation of N₂O emissions from subtropical plantation soils.

尽管对生物炭可有助于缓解土壤N ₂ O排放的机制范围有一个很好的了解，但仍缺乏有关与生物炭基肥料（BF）相关的功效和机制的信息。本12个月的田间试验的目的是：（1）调查土壤中的季节性变化的响应Ñ ₂ O排放和环境因素，包括土壤温度和水分含量，NH的浓度₄ ⁺ -N，NO ₃ ^--N，水溶性有机氮（WSON），微生物生物量氮（MBN），水溶性有机碳（WSOC）和微生物生物量C（MBC）以及脲酶和蛋白酶活性，用于高炉，化学肥料（CF）的应用）以及在毛竹林中的BF和CF（BCF）混合物，以及（2）揭示了土壤性质变化对土壤N ₂ O排放量变化的贡献。施肥的处理使BF，CF和BCF中的N，P和K的剂量匹配，并以未施肥的处理作为对照。与对照相比，高炉处理减少了土壤N ₂ O排放（P  <0.05），而CF和BCF处理增加了土壤N ₂ O排放（P  <0.05）。土壤N ₂ 在所有施肥处理中，O排放主要与土壤温度相关（P <0.01），并与土壤WSON浓度以及土壤脲酶和蛋白酶活性相关（P  <0.05）。此外，高炉处理显着（P  <0.05）降低了土壤WSON浓度以及土壤脲酶和蛋白酶活性，而CF和BCF处理则提高了土壤WSON浓度（P  <0.05）。结构方程建模结果表明，BF降低土壤N ₂的机理亚热带Moso竹林中的O排放是通过降低土壤中的WSON浓度和N循环酶活性来实现的。总之，目前的工作结果表明，高炉的应用可以为减轻亚热带人工林土壤中的N ₂ O排放提供重要的管理策略。