Premium
A Theoretical Model for GHG Emissions Due to Biochar Application in Tropical Agricultural Soils
Author(s) -
Novais Sarah Vieira,
Oliveira Zenero Mariana Delgado,
Frade Elizio,
Lima Renato,
Pelegrino Cerri Carlos Eduardo
Publication year - 2018
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2017.11.0665
Subject(s) - biochar , greenhouse gas , pyrolysis , soil water , soil texture , environmental science , environmental chemistry , straw , chemistry , agronomy , soil science , ecology , inorganic chemistry , organic chemistry , biology
Core Ideas Biochar mitigates greenhouse gas (GHG) emissions when applied to soils. The reduction in biochar pH leads to higher GHG mitigation. Enhancing biochar pyrolysis temperature also leads to higher GHG mitigation. CO 2 emission is explained negatively by the variables soil texture and biochar pH. CO 2 emission is explained positively by pyrolysis temperature and biochar dose.Biochar, a pyrolysis product, has the potential to reduce greenhouse gas (GHG) emissions while increasing the soil water holding capacity. The purpose of this paper is to model biochars GHG emission based on its applied dose, its pH value, pyrolysis temperature and soil texture. Poultry manure and sugarcane straw biochar produced at two temperatures (350 and 650°C), were applied in three doses (12.5, 25, and 50 Mg ha −1 ), to sandy and clayey soils at two soil pH values (original 7.5 and adjusted to 5.5). The concentrations of CO 2 , CH 4 and N 2 O were determined using gas chromatography. Increasing the biochar pyrolysis temperature and reducing the soil pH to 5.5 reduced the CO 2 , CH 4 , and N 2 O emissions from the soil. The mitigating effect of biochars was more evident in the sandy soil, since the clayey soil was highly buffed. The CO 2 emission, explained negatively by the variables soil texture and biochar pH and positively by the variables pyrolysis temperature and biochar dose, had the final equation: CO 2 = 82.28 – 0.05Cclay – 0.08pH + 6.98Tpyrolysis + 0.64Dbiochar ( R 2 = 0.65).