油松林氮矿化随土壤有机物质量的变化特征

于一; 郭华峰; 周志勇

doi:10.3969/j.issn.1000-2006.2017.01.011

油松林氮矿化随土壤有机物质量的变化特征

于一,郭华峰,周志勇

南京林业大学学报（自然科学版） ›› 2017, Vol. 41 ›› Issue (01) : 69-74.

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南京林业大学学报（自然科学版） ›› 2017, Vol. 41 ›› Issue (01) : 69-74. DOI: 10.3969/j.issn.1000-2006.2017.01.011

研究论文

油松林氮矿化随土壤有机物质量的变化特征

于一¹,郭华峰²,周志勇^1*

作者信息 +

The characteristics of soil nitrogen mineralization with different amounts of organic input in Pinus tabuliformis forest

YU Yi¹, GUO Huafeng², ZHOU Zhiyong^1*

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文章历史 +

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%(P＜0.05)。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%(P＜0.05); 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】Understand the mechanism of action of the different organic matter to soil nitrogen transform. 【Method】This study was carried out in Taiyue mountain of Shanxi Province. The inorganic nitrogen content of Pinus tabuliformis soil was monitored via the method of original site tube incubation after leaf detritus, stem wood detritus and biochar with equal weight applying into top soils. 【Result】The soil microbial biomass nitrogen content was significantly reduced by the wood debris applied, and that the soil nitrogen mineralization process showed distinctly seasonal variation. In May 2015, soil nitrate nitrogen content was markedly increased with 63.59%, 102.62% and 102.90% respectively compaire with CK by applied leaf debris, biochar and wood debris into the soil. However, the ammonium nitrogen content was reduced by the organic matter addition. Consequently, the net nitrogen mineralization was enhanced by 1.29, 0.40 and -3.47 mg/kg in the plots with biochar, leaf debris and wood debris addition, higher than that(-20.74 mg/kg)in the control plot. The nitrification rate was accelerated by organic matter addition in spring, autumn and winter, but was inhibited in summer. The ammonification rate was larger than zero only in winter for all treatments of organic matter addition. 【Conclusion】Soil nitrogen mineralization was accelerated by applying biochar over the annual scale and by applying wood debris over seasonal scale.

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于一,郭华峰,周志勇. 油松林氮矿化随土壤有机物质量的变化特征[J]. 南京林业大学学报（自然科学版）. 2017, 41(01): 69-74 https://doi.org/10.3969/j.issn.1000-2006.2017.01.011

YU Yi, GUO Huafeng, ZHOU Zhiyong. The characteristics of soil nitrogen mineralization with different amounts of organic input in Pinus tabuliformis forest[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(01): 69-74 https://doi.org/10.3969/j.issn.1000-2006.2017.01.011

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