Impact of Biochar on Nitrogen Leaching and Nitrous Oxide Emission in Paddy Soils
GAO Junlian
WANG Yongsheng
ZHANG Aiping
ZHU Donghai
LIU Ruliang
Abstract：Nitrogen leaching and emission as greenhouse gases are an important environmental issue in agricultur-al production. This paper investigated how optimizing fertilization and amending soil with biochar could reduce nitrate leaching and N2O emission from a paddy field in Yellow River Irrigation Region inNinxia. Biochar was ap-plied to soil at three rates (4.5, 9 and 13.5 t/hm2 per years), and no biochar amendment was taken as the control. The results showed that biochar amendment reduced leaching of nitrate and ammonium by 18.23%~26.03%and 28.86%~52.05%respectively. The C1 treatment (4.5 t/hm2) did not significantly reduce N2O emissions, but C2 (9 t/hm2) and C3 (13.5 t/hm2) did and reduced accumulative N2O emission by 25.13%and 28.88%, respectively. Amending soil with biochar increased the uptake of nitrogen by plant roots, thereby reducing nitrate and ammoni-um in soil as well as soil density, which is the main reason behind the reduction in nitrogen leaching and emis-sions from soil. Our results revealed that amending the paddy soil with biochar at 9 t/hm2 can effectively increase nitrogen uptake and reducenitrogen loss as a result.
Keywords：biocharNingxia Yellow River irrigation regionnitrogen leachingnitrous oxide emission
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 87-94 )