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首页> 外文期刊>Journal of plant nutrition and soil science >Relationship between greenhouse gas emissions and changes in soil gas diffusivity in a field experiment with biochar and lime
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Relationship between greenhouse gas emissions and changes in soil gas diffusivity in a field experiment with biochar and lime

机译：生物炭与石灰在田间试验中温室气体排放与土壤气体扩散性变化的关系

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Reducing greenhouse gas emissions from arable soil while maintaining productivity is a major challenge for agriculture. Biochar is known to reduce N2O emissions from soil, but the underlying mechanisms are unclear. This study examined the impact of green waste biochar (20 Mg ha(-1)) and lime (CaCO3; 2 Mg ha(-1)) application on soil gas transport properties and related changes in these to soil N2O and CO2 emissions measured using automated chambers in a field experiment cropped with maize. In situ soil water content monitoring was combined with laboratory measurements of relative soil gas diffusion coefficient (D-p/D-0) at different matric potentials, to determine changes in D-p/D-0 over time. Cumulative N2O emissions were similar in the control and lime treatment, but much lower in the biochar treatment. Cumulative CO2 emissions decreased in the order: lime treatment > biochar treatment > control soil. When N2O emissions were not driven by excess N supply shortly after fertilisation, they were associated with D-p/D-0 changes, whereby decreases in D-p/D-0 corresponded to N2O emissions peaks. No distinct pattern was observed between CO2 emissions and D-p/D-0. Cumulative N2O emissions were positively related to number of days with D-p/D-0 < 0.02, a critical limit for soil aeration. These results indicate that improved soil gas diffusivity, and hence improved soil aeration, may explain the effect of biochar in reducing N2O emissions. They also suggest that knowledge of D-p/D-0 changes may be key to explaining N2O emissions.
机译：减少耕地土壤的温室气体排放，同时保持生产力是农业的主要挑战。已知生物炭降低土壤的N2O排放，但潜在的机制尚不清楚。本研究检测了绿色废物生物炭（20mg HA（-1））和石灰（CaCO3; 2 mg HA（-1））对土壤气体运输性能的影响以及使用的含量和二氧化碳排放的相关变化用玉米裁剪现场实验中的自动腔室。原位土壤水分含量监测与不同的Matric电位的相对土壤气体扩散系数（D-P / D-0）的实验室测量相结合，以确定D-P / D-0的变化随时间。累积的N2O排放在对照和石灰处理中具有相似，但生物炭处理中的低得多。累积二氧化碳排放量减少：石灰处理>生物炭处理>对照土壤。当受精后不久的N 2 O电量没有通过过量的N电量驱动时，它们与D-P / D-0的变化相关，由此D-P / D-0的降低对应于N2O排放峰。在二氧化碳排放和D-P / D-0之间观察到没有明显的图案。累积N2O排放与D-P / D-0 <0.02的天数呈正相关，土壤通气的临界限制。这些结果表明，改善的土壤气体扩散率，因此改善了土壤通气，可以解释生物炭在减少N2O排放中的影响。他们还表明，D-P / D-0变化的知识可能是解释N2O排放的关键。

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