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生物质炭对旱作春玉米农田N2O排放的效应

DOI: 10.11654/jaes.2014.10.026, PP. 2063-2070

Keywords: 生物质炭,氧化亚氮,旱作玉米,氮肥

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Abstract:

通过田间试验,采用密闭式静态暗箱-气相色谱法研究不同生物质炭添加量(0、10、20、30t·hm-2)对黄土旱塬旱作春玉米农田N2O排放的影响。结果表明:生物质炭添加降低了施氮农田春玉米生长季N2O排放通量峰值和排放总量,添加30、20、10t·hm-2生物质炭的三个处理N2O排放总量比不添加生物质炭的处理分别降低19.24%、9.89%、3.40%,其中添加30t·hm-2生物质炭处理降低显着(P<0.05),但添加20t·hm-2的生物质炭未对不施氮农田N2O排放通量和总量产生显着影响。无论添加生物质炭与否,生长季不施氮处理的N2O排放通量和总量均显着低于施氮处理。添加生物质炭不同程度提升了农田0cm和10cm土壤温度,减少了施氮处理0~20cm土壤NH4+-N和NO3--N含量,但对农田0~20cm土层土壤含水量影响不显着。相关分析表明,试验农田N2O的排放通量与0~20cm土层土壤NO3--N和NH4+-N含量、含水量均呈极显着正相关关系(P<0.001),与0cm与10cm土壤温度呈负相关关系。添加生物质炭后矿质氮含量的减少可能是旱作春玉米农田N2O排放减少的主要原因。

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