Abstract
Application of biochar has been highly credited for its potential to sequester carbon and GHG mitigation from tropical agro-ecosystems. However, experiments show inconsistent results depending on soil and biochar type, cultivation system, climatic condition and the type of evolved GHGs. This study emphasized on the effect of biochar on carbon emission trends from a sequential dry and wet cultivation system of Bangladesh. An incubation study was conducted with two contrasting soils and eight different treatments viz. control, only fertilizer, three different biochars (10 t·ha-1) with and without recommended fertilizer dose. Results revealed the fact that, emission of carbon was substantially higher from Sara soil than Kalma soil. Biochar treatments did not have any easing effect on CO2 emission at field condition; rather, increased in most of the cases. However, emission was significantly (P 2. Biochar application was ineffective to control CH4 and CO release to atmosphere and submergence further intensified their emission significantly. The overall results indicate that applied biochars have negligible effect on carbon emission except for reducing CO2 from submerged soils.
Highlights
The global climate is changing rapidly due to simultaneous emission of anthropogenic greenhouse gases (GHG) into the atmosphere since the pre-industrial era [1]
At field condition, the emission of CO2 was considerably higher in biochar treated soils than the control and the sole-fertilized-one
At 30th day of incubation, the emission of CO2 dramatically increased for all the treatments; ranged from nearly doubled to as much as six times than the first recording date
Summary
The global climate is changing rapidly due to simultaneous emission of anthropogenic greenhouse gases (GHG) into the atmosphere since the pre-industrial era [1]. During the past few decades, total concentrations of CO2, CH4 and N2O in the atmosphere increased at rates of 0.5%, 0.8% and 0.3%, respectively [2]. Surface temperature has increased about 0.78 ̊C ± 0.06 ̊C since the last 19th century [3]. Agricultural activities are one of the major reasons of elevated GHG concentrations in the atmosphere. Total GHG emission from agriculture is estimated to be 1.4 - 1.6 Gt (Gigaton) CO2-C equivalent (CO2-Ce) year−1 which is approximately 12% - 14% of total human-induced warming effect [4]. It is high time to take serious steps to reduce the agricultural emission of GHGs to mitigate climate change
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