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RISS 인기검색어
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- 저자 : Malghani, Saadatullah (검색결과 1 건)
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Malghani, Saadatullah,Kim, Jinhyun,Lee, Seung-Hoon,Yoo, Ga-young,Kang, Hojeong Elsevier 2018 Applied soil ecology Vol.127 No.-
<P><B>Abstract</B></P> <P>Denitrification is the key microbial process that leads to gaseous loss of soil nitrogen in agricultural lands. Most alarmingly, the dominant gas species could be N<SUB>2</SUB>O, which is a much stronger greenhouse gas than CO<SUB>2</SUB>. In addition to the primary role as tool for soil carbon sequestration, biochar has the potential to suppress N<SUB>2</SUB>O emissions. However, the mechanism for the suppression of N<SUB>2</SUB>O emissions by biochar remains elusive. To address this, we performed a short-term incubation experiment targeting the impact of two contrasting biochars on gaseous loss of soil N under denitrification-favoring conditions including high load of NO<SUB>3</SUB> <SUP>−</SUP> (100 µg N/g soil), anoxia and high moisture content (70% WFPS). The acetylene inhibition technique was adopted to differentiate N losses as N<SUB>2</SUB> and N<SUB>2</SUB>O. Two biochars produced from rice chaff (600 °C, pH > 10, C:N 70) or rice husk (300 °C, pH < 5, C:N 54) were applied at two rates (5 and 10% w/w). Results exhibited an increase in gaseous loss of N in all biochar treatments compared with an unamended control. The presence of a positive correlation between total denitrification and CO<SUB>2</SUB> emission rates suggested that biochar derived labile carbon played a pivotal role in triggering the loss of N in gaseous forms. Similarly, the abundances of denitrifying genes <I>nosZ</I> and <I>nirS</I> were considerably higher in biochar treatments, indicating denitrifier’s heterotrophic nature. The biochar pyrolysis conditions and application rates played a decisive role in controlling N<SUB>2</SUB>O emissions. Rice chaff biochar, primarily characterized by its alkaline pH, significantly suppressed N<SUB>2</SUB>O emissions. Taken together, biochar amendment to agricultural soil can trigger N losses via denitrification and only the alkaline biochar suppressed N<SUB>2</SUB>O emissions, probably because of the enhanced activity of N<SUB>2</SUB>O reductase.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We recorded an increase in gaseous loss of N after application of rice base biochars. </LI> <LI> The abundance of denitrifying genes <I>nosZ</I> and <I>nirS</I> were higher in biochar treatments. </LI> <LI> Biochar addition to soil triggered rates of denitrification process. </LI> <LI> Soils treated with alkaline biochar had the lowest N<SUB>2</SUB>O emissions. </LI> </UL> </P>
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