Abstract
Increasing soil carbon storage and biomass utilization is an effective process for mitigating global warming. Coal bio-briquettes (CBB) are made using two low-ranked coals with high sulfur content, corn stalks, and calcium hydroxide, and the combustion ash can ameliorate the physicochemical properties in salt-affected soil. CBB ash contains mainly calcium compounds, such as calcium sulfate, calcium hydroxide, and calcium carbonate, and coal fly ash and biomass ash. In this paper, changes in soil carbon and nitrogen content through salt-affected soil amelioration during 5 months using two CBB ashes and pig manure were examined in Northeast China. Application rates of CBB ash were 0 tha−1 (control), 11.6 tha−1, 23.2 tha−1, 46.4 tha−1, and 69.6 tha−1. Consequently, total carbon content in topsoil (0–0.15 m) after harvest of maize in all test fields indicated a range between 27.7 tCha−1 and 50.2 tCha−1, and showed increased levels compared to untreated salt-affected soil. In a 3.0% (69.6 tha−1) application plot of only CBB ash with higher carbon and higher exchangeable Ca2+, the carbon content increased by 51.5% compared to control plot, and changes in carbon sequestration compared to untreated soil was roughly twice that of the control plot. CBB ash contributed to carbon application and pig manure supply as a form of N fertilization in the case of all test plots. Changes in carbon content due to soil amelioration have a significant relationship with changes in corn production and soil chemical properties, such as pH, Na+, Cl−, sodium adsorption ratio (SAR), and exchangeable sodium percentage (ESP). Therefore, CBB production from low-ranked coal and waste biomass, and the use of CBB ash in agriculture is advocated as an effective means for sequestering carbon.
Highlights
Over the past 60 years (1951–2012), an increase in atmospheric greenhouse gases (GHGs), such as carbon dioxide (CO2 ), has seen the global mean surface temperature rise by 0.72 ◦ C [1]
Large amounts of insoluble inorganic carbon exist in the subsoil of sodic soil and on limestone soils has the potential to play an important role in carbon cycling [4]
F4, there were differences between other groups in the case of. These results differences between other groups in the case of 2.0% and 3.0% (Figure 1). These results indicated an indicated an increase in carbon content ashasBawas as a soil amendment
Summary
Over the past 60 years (1951–2012), an increase in atmospheric greenhouse gases (GHGs), such as carbon dioxide (CO2 ), has seen the global mean surface temperature rise by 0.72 ◦ C [1]. Leftover ash following the combustion of CBB indicated salt-affected soil amelioration in production, and improvement in overall soil chemical and physical properties in Northeast China [21,22,23]. Both biochar production from bio-waste and effecting soil amendment to agricultural soils have shown significant potential in terms of mitigating the impact of climate change, while improving crop production [24]. Considering the salt-affected soil amelioration effect with CBB ash, this study could supply a new knowledge concerning biomass and low-ranked coal utilization and the carbon sequestration. The goal was to provide soil carbon sequestration due to salt-affected soil amelioration with CBB ashes
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