油松林氮矿化随土壤有机物质量的变化特征

发布时间：2018-06-17 07:34

本文选题：油松林 + 有机物质量　；参考：《南京林业大学学报(自然科学版)》2017年01期

【摘要】：【目的】明确不同类型有机物对土壤氮素转化的作用机理。【方法】以山西太岳山油松林为主要研究对象,通过向表层土壤添加等碳量的叶、木屑和生物炭等有机物碎屑,采用顶盖埋管原位培养法,测定了各处理样地不同时期的土壤无机氮含量。【结果】添加木屑使土壤微生物氮含量明显降低了45.57%(P0.05)。各处理的土壤有机氮矿化过程表现出很强的季节性变化。添加叶、生物炭和木屑处理下,土壤硝态氮含量变化以2015年5月最为明显,分别比对照提高了63.59%、102.62%和102.90%(P0.05);而添加外源有机物却降低了土壤中铵态氮的含量;在添加生物炭、叶和木屑处理下,土壤有机氮的净化量分别为1.29、0.40、-3.47 mg/kg,远高于对照样地的净化量(-20.74 mg/kg)。添加外源有机物在春季、秋季和冬季对土壤有机氮的硝化速率有明显的促进作用,却在夏季表现为抑制作用;而氨化速率仅在冬季全部呈现为正值。【结论】在年际尺度上,生物炭对土壤氮矿化的促进作用较强,短期内木屑对土壤氮矿化的促进作用较强。
[Abstract]:[objective] to clarify the action mechanism of different organic compounds on soil nitrogen transformation. [methods] taking Taiyueshan Pinus tabulaeformis forest in Shanxi Province as the main research object, organic debris such as leaves, wood chips and biochar were added to the surface soil. The content of inorganic nitrogen in soil at different stages of treatment was determined by in situ culture of covered tube. [results] addition of sawdust significantly reduced soil microbial nitrogen content by 45.57% P0.05%. The mineralization process of soil organic nitrogen in different treatments showed a strong seasonal variation. Under leaf, biochar and sawdust treatments, the change of nitrate nitrogen content in soil was the most obvious in May 2015, which increased by 103.59% and 102.90%, respectively, compared with the control, while the addition of exogenous organic matter decreased the content of ammonium nitrogen in soil. Under the treatments of leaves and sawdust, the amount of soil organic nitrogen purification was 1.29 ~ 0.40 ~ 3.47 mg / kg, which was much higher than that on the same land (-20.74 mg / kg ~ (-1) 路kg ~ (-1) ~ (-1). The addition of exogenous organic matter promoted the nitrification rate of soil organic nitrogen obviously in spring, autumn and winter, but inhibited the nitrification rate in summer, while the ammoniation rate was positive only in winter. [conclusion] on an interannual scale, Biochar can promote nitrogen mineralization in soil, and sawdust can promote nitrogen mineralization in soil in short term.
【作者单位】：北京林业大学林学院北京林业大学林业应对气候变化研究所;山西省太岳山国有林管理局灵空山林场;
【基金】：中央高校基本科研业务费专项资金项目(YX2014-10)
【分类号】：S714

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