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生物炭对红壤菜田土理化性质和N2O、CO2排放的影响

DOI: 10.11654/jaes.2013.09.027, PP. 1893-1900

Keywords: 生物炭,N2O,CO2,土壤理化性质

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Abstract:

农业废弃物转化成生物炭还田是近年来推行的固碳减排新技术。我国蔬菜土壤施肥量大、灌溉频繁、温室气体排放量高,然而生物炭对蔬菜土壤理化性质及温室气体排放的影响还少有研究。以南方红壤菜田土为供试土壤,通过盆栽实验,研究不同生物炭施用量(0、2%、5%、10%干土)对土壤理化性质和N2O、CO2排放的影响。结果表明,蕹菜地上部和地下部干重以NB0.1(10%干土)处理最大,其余处理间没有差异。蕹菜收获后,土壤pH值、CEC值和持水量(WHC)随生物炭用量增加而升高,与单施氮肥、不施生物炭处理(NB0)相比,蕹菜收获后,生物炭处理土壤NH+4-N含量和氨氧化潜势(NO-2-N)显著降低,NO-3-N含量显著增加,N2O排放显著降低,但CO2排放显著增加。土壤NH+4-N是影响N2O排放的最主要因素,土壤pH值对CO2排放的贡献最大。需进一步研究所涉及的C、N转化过程以及土壤理化性质变化在这些过程中的作用。

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