中文关键词磷水稻-油菜轮作土壤氧化亚氮(N₂O)硝化作用硝化率 英文关键词phosphorusrice-rapeseed rotation soilN₂Onitrificationnitrification rate

作者	单位	E-mail
孙正	华中农业大学资源与环境学院, 武汉 430070	sunzheng@webmail.hzau.edu.cn
苏荣琳	华中农业大学资源与环境学院, 武汉 430070
徐鹏	华中农业大学资源与环境学院, 武汉 430070
吴宏涛	华中农业大学资源与环境学院, 武汉 430070
胡金丽	华中农业大学资源与环境学院, 武汉 430070
赵劲松	华中农业大学资源与环境学院, 武汉 430070
胡荣桂	华中农业大学资源与环境学院, 武汉 430070 华中农业大学环境生态中心, 武汉 430070	rghu@mail.hzau.edu.cn

中文摘要 我国南方红壤区域普遍属于缺磷土壤，种植作物需要施用较多的磷肥，但添加磷对水稻-油菜轮作土壤中N₂O的排放影响并不明确.以潜江、咸宁两处水稻-油菜轮作模式下的土壤为研究对象，添加不同浓度的磷（0、15和30mg·kg^-1）和不同浓度的氮（0和100mg·kg^-1）进行室内培养实验，探究添加磷对水稻-油菜轮作土壤N₂O排放的影响.结果表明，添加磷对土壤中N₂O的排放有较为显著的影响，但影响的方式有所不同：在土壤本身氮比较少的情况下，添加磷会促进土壤中微生物对氮的固定，降低N₂O的排放；在土壤中有充足的氮情况下，添加较少的磷会促进土壤中硝化微生物的活动，促进N₂O的排放，但添加较多的磷同样会促进土壤中微生物对氮的固定，相比于添加较少的磷处理会抑制N₂O的排放；在土壤本身磷的含量较为充足的情况下，无论土壤中的氮源是否充足，添加磷仅对土壤中N₂O的排放起抑制作用. 英文摘要 The red soils in southern China are generally classified as phosphorus-deficient, and therefore planting crops in these regions usually requires high applications of phosphate fertilizer. However, the effect of phosphorus addition on N₂O emissions in rice-rapeseed rotation soils is not clear. We carried out an incubation experiment with the rice-rapeseed rotation soil from Qianjiang and Xianning to explore the effect of different concentrations of phosphorus (0, 15, and 30 mg·kg^-1) and different concentrations of nitrogen (0 and 100 mg·kg^-1) on N₂O emission. Studies have shown that the addition of phosphorus has a significant effect on soil N₂O emissions, but the pathways of impact are varied:in the case of low nitrogen soil, the addition of phosphorus promotes the fixation of nitrogen in the soil by microorganisms and thus reduces N₂O emissions; in case of sufficient nitrogen content in soil, adding less phosphorus promotes the activity of nitrifies and thereby promotes the emission of N₂O, while adding more phosphorus also promotes fixation by microorganisms in the soil; when there is a high content of available phosphorus in the soil, whether the nitrogen is sufficient or not, the addition of phosphorus will inhibit the emission of N₂O.

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