A laboratory study was conducted to study the effects of liming and different biochar amendments on N2O and CO2 emissions from acidic tea field soil. The first experiment was done with three different rates of N treatment; N 300 (300 kg N ha-1), N 600 (600 kg N ha-1) and N 900 (900 kg N ha-1) and four different rates of bamboo biochar amendment; 0%, 0.5%, 1% and 2% biochar. The second experiment was done with three different biochars at a rate of 2% (rice husk, sawdust, and bamboo) and a control and lime treatment (dolomite) and control at two moisture levels (50% and 90% water filled pore space (WFPS)). The results showed that dolomite and biochar amendment significantly increased soil pH. However, only biochar amendment showed a significant increase in total carbon (C), C/N (the ratio of total carbon and total nitrogen), and C/IN ratio (the ratio of total carbon and inorganic nitrogen) at the end of incubation. Reduction in soil NO3--N concentration was observed under different biochar amendments. Bamboo biochar with the rates of 0.5, 1 and 2% reduced cumulative N2O emission by 38%, 48% and 61%, respectively, compare to the control soil in experiment 1. Dolomite and biochar, either alone or combined significantly reduced cumulative N2O emission by 4.6% to 32.7% in experiment 2. Reduction in N2O production under biochar amendment was due to increases in soil pH and decreases in the magnitude of mineral-N in soil. Although, both dolomite and biochar increased cumulative CO2 emission, only biochar amendment had a significant effect. The present study suggests that application of dolomite and biochar to acidic tea field soil can mitigate N2O emissions.
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机译：进行了一项实验室研究，以研究石灰和不同生物炭添加剂对酸性茶田土壤N2O和CO2排放的影响。第一个实验是使用三种不同的N处理速率进行的； N 300（300千克N ha -1 ），N 600（600千克N ha -1 ）和N 900（900 kg N ha -1 ） sup>）和四种不同比率的竹生物炭改性剂； 0％，0.5％，1％和2％生物炭。第二个实验是使用三种不同的生物炭（比率分别为2％）（稻壳，锯末和竹子）以及对照和石灰处理（白云石）进行的，并且在两种湿度水平下（分别以50％和90％的水填充毛孔空间（ WFPS））。结果表明，白云石和生物炭改良剂显着提高了土壤的pH值。但是，只有生物炭改良剂在培养结束时显示总碳（C），C / N（总碳与总氮的比率）和C / IN比（总碳与无机氮的比率）显着增加。 。在不同生物炭修正下，土壤NO3 - -N浓度降低。与实验1的对照土壤相比，比率为0.5、1和2％的竹生物炭分别减少了累积N2O排放38％，48％和61％。白云石和生物炭单独或联合使用可显着减少累积N2O排放在实验2中减少了4.6％至32.7％。生物炭改良下的N2O产量减少是由于土壤pH值升高和土壤中矿质N含量降低所致。尽管白云石和生物炭均增加了累积的CO2排放量，但只有生物炭改良剂才具有显著作用。本研究表明，将白云石和生物炭应用于酸性茶田土壤可减轻N2O排放。
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