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为了解亚热带典型森林土壤氮素和有机氮素特征,采集大围山森林公园典型森林土壤剖面(0~100 cm),按每10 cm一层采集土壤样品,研究土壤氮素和有机氮变化规律及其与土壤理化性质的关系.结果表明:1土壤全氮、酸解性有机氮、可溶性有机氮含量均随剖面深度增加而呈下降趋势,受海拔高度影响,高海拔山地花岗岩黄棕壤土壤全氮和有机氮组分含量较高;2土壤有机氮占全氮比平均97.39%±1.17%,酸解性有机氮占全氮比平均64.38%±10.68%,酸解性有机氮各组分均随剖面深度增加而降低;3土壤可溶性有机氮含量范围为9.92~23.45 mg·kg-1,游离氨基酸氮(1.62~12.02 mg·kg-1)占可溶性有机氮比为27.36%±9.95%;4酸解性有机氮、可溶性有机氮与土壤全氮、可溶性总氮、无机氮均达到显著的正相关关系(P<0.05),与土壤容重、有机碳和全磷具有极显著的相关关系(P<0.01).亚热带典型森林土壤中有机氮是土壤全氮的主体,受海拔高度和土壤理化性质的影响,各组分随土壤剖面深度的增加呈下降趋势,有机氮组分与各氮素形态间的转化关系密切,土壤有机氮特征将深刻影响森林生态系统氮的循环过程.
In order to understand the characteristics of soil nitrogen and organic nitrogen in typical subtropical forest, the soil profile of typical forest in Dawei Mountain Forest Park was collected (0-100 cm). Soil samples were collected every 10 cm to study the variation of soil nitrogen and organic nitrogen The results showed that: (1) The contents of soil total nitrogen, acidolating organic nitrogen and soluble organic nitrogen all decreased with the depth of the section increasing. Affected by the altitude, the content of soil total nitrogen, Total nitrogen and organic nitrogen components were higher; 2 Organic nitrogen in soil accounted for 97.39% ± 1.17% of the total nitrogen; Organic nitrogen in total acid was 64.38% ± 10.68% The content of soluble organic nitrogen in soil ranged from 9.92 to 23.45 mg · kg-1, and the content of free amino acid nitrogen (1.62-12.02 mg · kg-1) was 27.36% ± 9.95%. There was a significant positive correlation between acidoluble organic nitrogen and soluble organic nitrogen and soil total nitrogen, soluble total nitrogen and inorganic nitrogen (P <0.05), and extremely significant correlation with soil bulk density, organic carbon and total phosphorus ( P <0.01). Organic nitrogen in typical subtropical forest soil is The main body of soil total nitrogen, influenced by altitude and soil physical and chemical properties, each component decreased with the increase of soil profile depth, organic nitrogen composition and the transformation of each nitrogen form closely, soil organic nitrogen characteristics will be profound Affect the nitrogen cycle of forest ecosystem.