Nitrous oxide emission from agricultural soils: Application of animal manure or biochar? A global meta-analysis

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:285

Article

Shakoor, Awais¹  Shahzad, Sher Muhammad²  Chatterjee, Nilovna³  Arif, Muhammad Saleem⁴  Farooq, Taimoor Hassan⁵  Altaf, Muhammad Mohsin⁶  Tufail, Muhammad Aammar^7,8  Dar, Afzal Ahmed⁹  Mehmood, Tariq¹⁰ 

[1] Univ Lleida, Dept Environm & Soil Sci, Avinguda Alcalde Rovira Roure 191, Lleida 25198, Spain

[2] Univ Sargodha, Coll Agr, Dept Soil & Environm Sci, Sargodha 40100, Punjab, Pakistan

[3] CIBO Technol, Cambridge, MA USA

[4] Govt Coll Univ Faisalabad, Dept Environm Sci & Engn, Faisalabad 38000, Pakistan

[5] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China

[6] Hainan Univ, Coll Ecol & Environm, State Key Lab Marine Resource Utilizat South Chin, Haikou 570228, Hainan, Peoples R China

[7] Fdn Edmund Mach, Res & Innovat Ctr, I-38010 San Michele All Adige, Italy

[8] Univ Trento, Dept Civil Environm & Mech Engn, I-38123 Trento, Italy

[9] Shaanxi Univ Sci & Technol, Sch Environm Sci & Engn, Xian, Peoples R China

[10] Hohai Univ, Coll Environm, Nanjing 210098, Peoples R China

关键词: Nitrous oxide;    Animal manure;    Biochar;    Meta-analysis;    Mitigation;    Emission factor;   

DOI  :  10.1016/j.jenvman.2021.112170

来源: Elsevier

【 摘 要 】

Organic amendments (animal manure and biochar) to agricultural soils may enhance soil organic carbon (SOC) contents, improve soil fertility and crop productivity but also contribute to global warming through nitrous oxide (N2O) emission. However, the effects of organic amendments on N2O emissions from agricultural soils seem variable among numerous research studies and remains uncertain. Here, eighty-five publications (peer-reviewed) were selected to perform a meta-analysis study. The results of this meta-analysis study show that the application of animal manure enhanced N2O emissions by 17.7%, whereas, biochar amendment significantly mitigated N2O emissions by 19.7%. Moreover, coarse textured soils increased [(lnRR) over bar = 182.6%, 95% confidence interval (CI) = 151.4%, 217.7%] N2O emission after animal manure, in contrast, N2O emission mitigated by 7.0% from coarse textured soils after biochar amendment. In addition, this study found that 121-320 kg N ha(-1) and <= 30 T ha(-1) application rates of animal manure and biochar mitigated N2O emissions by 72.3% and 22.5%, respectively. Soil pH also played a vital role in regulating the N2O emissions after organic amendments. Furthermore, > 10 soil C: N ratios increased N2O emissions by 121.4% and 27.6% after animal and biochar amendments, respectively. Overall, animal manure C: N ratios significantly enhanced N2O emissions, while, biochar C: N ratio had not shown any effect on N2O emissions. Overall, average N2O emission factors (EFs) for animal manure and biochar amendments were 0.46% and -0.08%, respectively. Thus, the results of this meta-analysis study provide scientific evidence about how organic amendments such as animal manure and biochar regulating the N2O emission from agricultural soils.

【 授权许可】

Free