| 大围山典型森林土壤有机氮垂直分布特征 |
| 摘要点击 2517 全文点击 1597 投稿时间：2014-11-06 修订日期：2015-05-12 |
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| 中文关键词 森林土壤 有机氮 酸解性有机氮 可溶性有机氮 垂直分布 |
| 英文关键词 forest soil organic nitrogen acid hydrolysable nitrogen soluble organic nitrogen vertical distribution |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| To clarify altitudinal gradient of subtropical forest soil total nitrogen and organic nitrogen, soil samples were collected per 10 cm on soil profile (0-100 cm) in Dawei Mountain, researched the variation of soil organic nitrogen and correlation with soil physical and chemical properties.The results showed that: ①Total nitrogen, acid hydrolysable organic nitrogen and soluble organic nitrogen decreased with the increase of depth, content of each component in mountain granite yellow-brown soils was much higher affected by altitude;②The average percentage of soil organic nitrogen to total nitrogen was 97.39%±1.17%, and soil acid hydrolysable organic nitrogen was 64.38%±10.68%, each component decreased with the increase of soil depth;③Soil soluble organic nitrogen content was 9.92-23.45 mg·kg-1, free amino acids (1.62-12.02 mg·kg-1) accounted for about 27.36%±9.95% of soluble organic nitrogen;④Soil acid hydrolysable organic nitrogen and soluble organic nitrogen were significantly positively correlated with total nitrogen, total soluble nitrogen and inorganic nitrogen(P<0.05), were highly significantly correlated with soil bulk density, organic carbon, and total phosphorus (P<0.01).Organic nitrogen was the main body of soil nitrogen in typical subtropical forest, each component showed a downward trend increase with soil depth affected by altitude and soil physical and chemical properties.There was a close conversion relationship between soil organic nitrogen and other nitrogen forms, the characteristics of soil organic nitrogen will have profound impact on nitrogen cycling of forest ecological system. |
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