Biochar application and summer temperatures reduce N2 O and enhance CH4 emissions in a Mediterranean agroecosystem: Role of biologically-induced anoxic microsites

The Science of the Total Environment
A RibasX Domene

Abstract

Biochar applications have been proposed for mitigating some soil greenhouse gas (GHG) emissions. However, results can range from mitigation to no effects. To explain these differences, mechanisms have been proposed but their reliability depends on biochar type, soil and climatic conditions. Furthermore, it is found that the mitigation capacity is dependent on how the biochar is aging under field conditions. The effects on N2O, CH4 and CO2 emission rates of a gasification pine biochar (applied as 0, 5, and 30 t ha-1) were studied between 8 and 21 months of the application in an alkaline soil cropped to barley under Mediterranean climate. Together with GHG, soil chemical and biological properties were assessed, namely, changes in labile organic matter content and nutrient status, and pH, as well as microbial abundance, activity, and functional composition. During the 2 years of the application, significant changes were observed at the highest rate of biochar application such as higher contents of water, K+, Mg2+, SO42-, higher basal respiration, and with non-significant changes in microbial community, though with some temporal effects. Regarding GHG, N2O decreases coupled with CH4 increases in the summer sampling were measured, a...Continue Reading

Citations

Jul 16, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sheng ChengBo Yan
Oct 5, 2020·The Science of the Total Environment·Alba LlovetAngela Ribas
Feb 11, 2021·Environmental Science and Pollution Research International·Xingren LiuWeidong Kong
Jul 17, 2021·Journal of Hazardous Materials·Ling XiangXiaofei Tan
Oct 30, 2021·The Science of the Total Environment·Adam KubaczyńskiMałgorzata Brzezińska

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