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| Effect of corn stalk and its biochar on N2O emissions from latosol soil |
| Received:September 07, 2015 |
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| KeyWord:biochar;corn stalk;initial nitrogen addition;nitrification;nitrous oxide |
| Author Name | Affiliation | E-mail | | PAN Feng-e | Agricultural College, Hainan University, Haikou 570228, China | | | HU Jun-peng | Agricultural College, Hainan University, Haikou 570228, China | | | SUO Long | Agricultural College, Hainan University, Haikou 570228, China | | | WANG Xiao-qi | Agricultural College, Hainan University, Haikou 570228, China | | | JI Ya-lan | Agricultural College, Hainan University, Haikou 570228, China | | | MENG Lei | Agricultural College, Hainan University, Haikou 570228, China | menglei94@sohu.com |
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| Abstract: |
| A 60-d incubation experiment was conducted to investigate the effects of corn stalk and its biochar additions on properties, nitrification and N2O emissions of latosol soil under 30℃ and 75% field water holding capacity. Three treatments including biochar addition, stalk addition and control(CK) were used. At the end of the experiment, both biochar and stalk additions significantly increased soil pH, organic C, and available K content, with greater effects observed in stalk addition. Compared with CK(1604±169μg N2O-N·kg-1), stalk and biochar additions significantly reduced cumulative N2O emissions by 58.0% and 65.6%, respectively. However, the mechanisms by which N2O emissions reduced were different for biochar-and stalk-treated soils. N2O reduction in stalk-treated soil was attributed to decrease in the nitrification of NH4+ pool caused by increased NH4+ immobilization, while N2O reduction in biochar-treated soil was probably due to decreased N2O production ratio from nitrification. Biochar enhanced the nitrification rate and produced large NO3- content, thus increasing the risk of nitrate leaching in tropical latosol soil. |
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