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硝态氮源及碳源有效性对土壤N_2O和CO_2排放的影响
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硝态氮源及碳源有效性对土壤N_2O和CO_2排放的影响
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Journal Article
硝态氮源及碳源有效性对土壤N_2O和CO_2排放的影响
2016
Overview
以华北平原农田土壤为对象,通过室内静态培养系统研究NO_3~--N与不同碳源组合对土壤N_2O和CO_2排放的影响。结果表明,NO_3~--N作为氮源和不同碳源施入土壤,除NO_3~-＋纤维素,其余土壤N_2O排放通量均高于对照组和只添加氮源土壤;NO_3~--N和不同碳源组合的CO_2累积排放量均高于对照和只添加氮源土壤。NO_3~-＋果胶的N_2O排放量在第1 d达到最大值1 383.42μg N·kg~（-1）·d~（-1）;NO_3~-＋葡萄糖的CO_2排放量在第1 d达到最大值370.13 mg C·kg~（-1）·d~（-1）,CO_2累积排放量顺序为：葡萄糖〉果胶〉秸秆〉纤维素〉淀粉〉木质素。土壤NO_3~--N含量与N_2O排放呈极显著正相关。总之,添加纤维素可以抑制N_2O的排放,促进CO_2排放,并增加土壤中NO_3~--N含量,添加其余碳源均会促进土壤N_2O和CO_2排放。
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