【作者】 胡荣桂； 林杉； 冯明磊；

【Author】 Hu Ronggui Lin Shan Feng Minglei (College of Resources and Environmental Science,Huazhong Agricultural University,Wuhan 430070,China)

【机构】 华中农业大学资源与环境学院；

【摘要】 以采自三峡库区的黄棕壤和紫色土为研究材料,在25℃以及水分含量为40%、80%、100%WFPS的条件下进行室内培养实验,研究了不同土壤N₂O的排放与土壤可溶性碳、氮含量的关系。结果表明,在相同控制条件下,土壤有机碳含量高的黄棕壤具有较高的N₂O排放量;在培养期间,N₂O排放呈现出先增加后减小的变化趋势,且与土壤中的可溶性有机碳和硝态氮含量变化趋势一致。黄棕壤N₂O排放与可溶性有机碳极显著正相关、与硝态氮显著正相关;而紫色土N₂O排放与硝态氮、微生物量碳极显著正相关,与可溶性有机碳显著正相关;微生物量碳、铵态氮与N₂O排放没有明显的相关关系。更多还原

【Abstract】 N₂O fluxes from soils collected from Three Gorges area were incubated at 25℃and 40%,80%, 100%of the water filled pore space（WFPS） for 31 days.The results shown that soil total organic carbon bear significant impaction on N₂O fluxes,for yellow brown soils with high content of soil organic carbon.Soil N₂O fluxes increased at the beginning and then decreased Similar to N₂O fluxes,soil dissolved organic carbon and soil nitrate reached their peak and decreased thereafter.Correlation analysis indicated that soil N₂O fluxes was positive correlated with soil dissolved organic carbon,soil nitrate nitrogen contents,respectively.While there was no significant correlation between N₂O fluxes and soil microbial biomass carbon,soil ammonium nitrogen.更多还原