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Effects of biochar application on nitrogen transformation and N2O emission in a coastal saline-alkali soil

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Author:: No author available

Journal Title:: Chinese Journal of Applied Ecology

Issue:: 11

DOI:: 10.13287/j.1001-9332.202311.014

Key Word:: 滨海盐碱土;硝化作用;矿化作用;N2O;生物炭;coastal saline-alkali soil;nitrification;mineralization;N2O;biochar

Abstract：生物炭在土壤培肥改良中的应用有助于农业可持续发展和碳中和目标的实现.为更好地了解生物炭对滨海盐碱土氮素转化和N2O排放的影响及其潜在机制,本研究按等氮原则,以仅添加硫酸铵(N 150 mg·kg-1,下同)为对照,设置5个处理,即硫酸铵+0.4％生物炭处理(W/W,下同)、硫酸铵+0.6％生物炭处理、硫酸铵+0.8％生物炭处理、硫酸铵+1.6％生物炭处理、硫酸铵+0.2％生物炭+0.2％有机肥处理,进行室内培养试验(60d).结果表明:生物炭对土壤氮素转化的影响主要在培养前期,与对照相比,添加生物炭显著增加了滨海盐碱土的硝态氮和铵态氮含量;生物炭显著提高了土壤净硝化速率,且净硝化速率随生物炭添加量的增加而减小;各处理土壤N2O排放的动态变化趋势基本一致,且主要集中在培养前30 d;与对照相比,生物炭添加显著降低了 N2O累积排放量,且降幅随添加量的增加而增大.可见,不同添加量生物炭与氮肥配施对土壤氮转化速率和N2O排放的影响不同,其中,0.8％生物炭处理不仅能显著提高土壤无机氮含量,而且能有效降低土壤N2O排放,可作为生物炭改良与培肥滨海盐碱土的最佳剂量.

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