Yang Yu-Han, Yi Jian-Ting, Zhang Cheng, Chen Hong, Mu Zhi-Jian
College of Resources and Environment, Southwest University, Chongqing 400715, China.
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, China.
Huan Jing Ke Xue. 2017 Apr 8;38(4):1647-1653. doi: 10.13227/j.hjkx.201606060.
Effect of application of sewage sludge compost on the emission of greenhouse gas from soil was investigated by analyzing the dynamic characteristics and emission factor of CO, CH and NO in soil after spiking two different composts (A:compost with biochar, B:compost without biochar) with varying fertilizing amount into soil. The results indicated that emissions of CO and CH mainly occurred in the plant growth period with low fertilizer amount of biomass charcoal compost reducing CO emissions, and high application content increasing CO emissions. CH emission fluxes showed negative values, indicating that soil could adsorb CH, and the adsorbing amount for control was significantly higher than those for other treatments (<0.01). The absorbing amount in treatment A increased with the fertilizing amount (<0.05). NO emissions mainly occurred at the germination and seedling stages, and emission fluxes increased with the fertilizing amount (<0.01). NO was considered as the main generated greenhouse gas during agricultural process with sludge compost, and its emission factor from sludge compost soil was 1.02%-1.90% (A compost) and 1.28%-2.93% (B compost), respectively. Biochar could significantly reduce the carbon emission, as the total greenhouse gas released from soil with biochar compost was 19.49% to 35.56% less than that in soil without biochar, which was more obvious for NO emission reduction (compared with CH mitigation).
通过分析在土壤中添加两种不同堆肥（A：含生物炭的堆肥，B：不含生物炭的堆肥）并改变施肥量后土壤中CO、CH和NO的动态特征及排放因子，研究了施用污泥堆肥对土壤温室气体排放的影响。结果表明，CO和CH排放主要发生在植物生长阶段，生物质炭堆肥施肥量低时可减少CO排放，施肥量高时则增加CO排放。CH排放通量呈负值，表明土壤可吸附CH，对照处理的吸附量显著高于其他处理（<0.01）。处理A的吸附量随施肥量增加而增加（<0.05）。NO排放主要发生在发芽和幼苗阶段，排放通量随施肥量增加而增加（<0.01）。NO被认为是污泥堆肥农业过程中产生的主要温室气体，其在污泥堆肥土壤中的排放因子分别为1.02%-1.90%（A堆肥）和1.28%-2.93%（B堆肥）。生物炭可显著减少碳排放，因为含生物炭堆肥土壤释放的总温室气体比不含生物炭的土壤少19.49%至35.56%，这在减少NO排放方面更为明显（与减少CH排放相比）。
