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OALib Journal期刊
ISSN: 2333-9721
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持续碳源添加对油松和连香树林地土壤氮转化的影响
DOI: 10.3724/SP.J.1145.2013.00426, PP. 426-433
Keywords: 外加碳源,葡萄糖,土壤,氮净矿化,油松,连香树
Abstract:
采用室内培养方法研究了持续添加不同浓度葡萄糖溶液（0、75、150和225?gg-1，以土壤中c浓度计，下同）对不同养分状况的油松和连香树林地土壤氮转化过程的影响.结果显示，在培养的56d里，持续添加75?gg-1的葡萄糖溶液有效促进了油松林土壤氮净矿化，持续添加150?gg-1的葡萄糖溶液在培养后期促进了油松林土壤氮净矿化，而持续添加225?gg-1的葡萄糖溶液在整个培养期内显著抑制油松林土壤氮净矿化.3个浓度的碳源持续添加处理均降低了油松林土壤可溶性有机氮含量，仅在第56天时，高浓度碳添加处理油松林土壤可溶性有机氮与对照处理差异不显著.3个浓度的碳源持续添加处理对油松林土壤微生物量氮变化的影响有所不同.对于连香树林土壤，3个浓度的碳源持续添加处理均显著促进了氮的净矿化，在培养后期不同程度地增加了可溶性有机氮的含量.研究结果表明不同林地土壤氮转化对持续外加可溶性碳源的响应过程有所不同，养分状况较差的土壤的响应模式更为复杂.
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