文献类型： 外文期刊

作者： Lan, Zhongming ¹ ; Chen, Chengrong ¹ ; Rashti, Mehran Rezaei ¹ ; Yang, Hong ³ ; Zhang, Dongke ³ ;

作者机构： 1.Griffith Univ, Australian Rivers Inst, Sch Environm & Sci, Nathan, Qld, Australia

2.Fujian Acad Agr Sci, Soil & Fertilizer Inst, Fuzhou, Fujian, Peoples R China

3.Univ Western Australia, Sch Mech & Chem Engn M050, Ctr Energy M473, Crawley, WA, Australia

关键词： Biochar amendment; biomass pyrolysis; greenhouse gas mitigation; microbial gene abundance; mineral nitrogen dynamics; plant nitrogen uptake

期刊名称：GLOBAL CHANGE BIOLOGY BIOENERGY （ 影响因子：4.745； 五年影响因子：5.672 ）

ISSN： 1757-1693

年卷期： 2018 年 10 卷 12 期

页码：

收录情况： SCI

摘要： Biochar-bioenergy coproduction from biomass pyrolysis has the potential to contribute to climate change mitigation. Biochar produced at various pyrolysis temperatures (<600 degrees C) has been widely studied. However, the effect of biochars, produced at high pyrolysis temperature (>= 600 degrees C), on soil nitrogen (N) dynamics and nitrous oxide (N2O) emission is largely unknown. A pot trial was performed to examine the effect of high pyrolysis temperature (600, 700, 850 and 950 degrees C) woody biochars on soil N dynamics, microbial gene abundance and N2O emissions with (+N) and without N (-N) fertilization from an acid soil. Results showed that all biochar treatments significantly lowered the N2O emissions in both fertilized and unfertilized regimes. However, the suppressive effect on N2O emission among different high pyrolysis temperatures was not statistically different. Biochar amendment significantly decreased the concentration of soil NH4+, and lower levels of soil NO3- were observed at the later stage of experiment. Under -N, plant biomass and N uptake were significantly lowered in all biochar treatments. Under +N, biochar addition significantly increased plant biomass, while only the 700 degrees C biochar significantly increased N uptake. This suggests that single application of biochar could limit soil mineral N bioavailability and further decrease plant growth and N uptake in the plant-soil system. Biochar amendments tended to increase nitrous oxide reductase (nosZ) gene abundance, but this effect was only significant for biochar produced at 950 degrees C under +N. In conclusion, high pyrolysis temperature biochars can be effectively used to reduce N2O emission, while increases in nosZ gene abundance and decreases in NH4+ and NO3- concentrations in the acid soil are likely to be responsible for the reduction in N2O emission. Thus, woody biochars as a by-product produced at high pyrolysis temperature have the potential to mitigate soil N2O emission via modifying N transformation and further affect climate change.