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采用室内培养试验,研究了不同生物黑炭施用量对两种茶园土壤(红壤和黄壤)CO2、N2O排放特征的影响。生物黑炭用量设5个水平:H0(0 g·kg-1)、H1(3.56 g·kg-1)、H2(7.11 g·kg-1)、H3(14.22 g·kg-1)、H4(28.44 g·kg-1)。结果表明:红壤茶园土壤CO2排放量显著高于黄壤,N2O排放总量则低于黄壤;与H0处理相比,施用低量的生物黑炭(H1)对两种茶园土壤CO2排放无显著影响;高量的生物黑炭处理(H3、H4)则显著增加土壤CO2排放量,增幅为20%~47%(P<0.05)。生物黑炭施用后(H2、H3、H4)明显降低两种茶园土壤N2O释放速率及反硝化损失率,土壤N2O排放总量降幅为37%~63%(P<0.05),反硝化损失量降幅22%~54%(P<0.05),且均随着生物黑炭施用量增加而增大。此外,从土壤p H值、无机氮含量和硝化率角度,探讨了生物黑炭影响茶园土壤CO2和N2O排放的因素。
Indoor cultivation experiments were conducted to study the effects of different bio-black carbon application rates on CO2 and N2O emission from two types of tea plantation soils (red and yellow soils). The amount of biochar was set at 5 levels: H0 (0 g · kg-1), H1 (3.56 g · kg-1), H2 (7.11 g · kg-1) (28.44 g · kg -1). The results showed that the soil CO2 emission of red soil tea plantation was significantly higher than that of yellow soil and the total N2O emission was lower than that of yellow soil. Compared with H0 treatment, the application of low amount of bio-black carbon (H1) High amounts of biological black carbon treatment (H3, H4) significantly increased soil CO2 emissions, an increase of 20% to 47% (P <0.05). After biochar application (H2, H3 and H4), the N2O release rate and denitrification loss rate of two types of tea plantation soils decreased obviously, the total N2O emission decreased by 37% -63% (P <0.05), and the decline of denitrification loss 22% -54% (P <0.05), both of which increased with the increase of biochar application rate. In addition, the factors influencing the emissions of CO2 and N2O from tea plantation soils were discussed from the aspects of p H value, inorganic nitrogen content and nitrification rate.