Converting rice husk to biochar reduces bamboo soil N2 O emissions under different forms and rates of nitrogen additions
Zhou, Rong; El-Naggar, Ali; Li, Yongfu; Cai, Yanjiang; Chang, Scott X.;
Abstract
The effects of biochar application combined with different forms and rates of inorganic nitrogen (N) addition on nitrous oxide (N2O) emissions from forest soils have not been well documented. A microcosm experiment was conducted to study the effects of rice husk and its biochar in combination with the addition of N fertilizers in different forms (ammonium [NH4+] and nitrate [NO3−]) and rates (equivalent to 150 and 300 kg N ha−1 yr−1) on N2O emissions from Lei bamboo (Phyllostachys praecox) soils. The application of rice husk significantly increased cumulative N2O emissions under the addition of both NO3−-N and NH4+-N. Biochar significantly reduced cumulative N2O emissions by 15.2 and 5.8 μg N kg−1 when co-applied with the low and high rates of NO3−–N, respectively, compared with the respective NO3−-N addition rate without biochar. There was no significant difference in soil N2O emissions between the two NH4+-N addition rates, and cumulative N2O emission decreased with increasing soil NH4+-N concentration, mainly due to the toxic effect caused by the excessive NH4+-N on soil N2O production from the nitrification process. Cumulative N2O emissions recorded 18.74 and 14.04 μg N kg−1 under low and high rates of NO3−-N addition, respectively, which were higher than those produced by NH4+-N addition. Our study demonstrated that the conversion of rice husk to biochar could reduce N2O emissions under the addition of different N forms and rates. Moreover, rice husk or its biochar in combination with NH4+-N fertilizer produced less N2O in Lei bamboo soil, compared with NO3−-N fertilizer.
Other data
Title | Converting rice husk to biochar reduces bamboo soil N<inf>2</inf>O emissions under different forms and rates of nitrogen additions | Authors | Zhou, Rong; El-Naggar, Ali ; Li, Yongfu; Cai, Yanjiang; Chang, Scott X. | Keywords | Exogenous carbon;Greenhouse gas;Lei bamboo forest;Nitrogen form;Nitrogen rate | Issue Date | 1-Jun-2021 | Journal | Environmental Science and Pollution Research | Volume | 28 | Start page | 28777 | End page | 28788 | ISSN | 09441344 | DOI | 10.1007/s11356-021-12744-w | PubMed ID | 33550547 | Scopus ID | 2-s2.0-85100683439 |
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