【摘要】 【目的】研究天山云杉林不同更新方式对土壤碳氮的影响,了解碳、氮的生物地球化学循环。【方法】采用典型样方法,研究新疆天山云杉林不同更新方式对土壤碳氮含量的影响。【结果】不同更新方式下林地土壤有机碳、全氮含量均随着土层加深呈逐渐下降的趋势。不同更新方式间土壤有机碳含量的差异主要在0～25 cm土层。与老龄云杉林相比,更新后,天然更新林、人促更新林和人工更新林0～10 cm土层土壤有机碳含量分别下降21.08、27.83和53.2 g/kg, 10～25 cm土层分别比老龄云杉林下降9.09、13.88和13.83 g/kg,且与老龄云杉林差异均达到显著水平(P<0.05);而不同更新方式间全氮含量的差异主要在0～10 cm土层,分别比老龄云杉林下降0.44、0.71和0.98 g/kg,且与老龄云杉林差异均达到显著水平(P<0.05)。不同更新方式对林地土壤有机碳及全氮储量的影响不同,75 cm深土壤有机碳及全氮储量的大小顺序依次为,天然更新林>人促更新林>人工更新林。【结论】不同更新方式对林地土壤碳氮影响程度不同,人工更新林土壤碳氮含量比天然更新林土壤下降的更为明显,其中表层土壤反映最为敏感,下降最快。更多还原

【Abstract】 【Objective】 To explore the effects of different regeneration patterns on soil carbon and nitrogen in Picea schrenkiana in the hope of understanding the biogeochemical cycle of carbon and nitrogen.【Method】The effects of different regeneration patterns on soil carbon and nitrogen contents in Picea schrenkiana of Xinjiang were studied by using the survey methods of typical samples. 【Result】The results showed that the soil organic carbon and total nitrogen content decreased gradually with the increase of soil layer under different regeneration patterns. The difference of soil organic carbon content between different regeneration patterns was mainly in the 0-25 cm soil layer. Compared with the aged Picea schrenkiana forest, the soil organic carbon content in the 0-10 cm soil layer of natural renewal forest, man-led and artificial regeneration forest decreased by 21.08, 27.83 and 53.2 g/kg, respectively; the content of 10-25 cm soil layer decreased by 9.09, 13.88 and 13.83 g/kg, respectively, and all of them were significantly different with the aged Picea schrenkiana forest(P< 0.05). But the difference of the total nitrogen content under different regeneration patterns was mainly in the 0-10 cm soil layer, which was decreased by 0.44, 0.71 and 0.98 g/kg, respectively, compared with the aged Picea schrenkiana forest, and the differences were significant(P< 0.05). Different regeneration patterns affected the storage of soil organic carbon and total nitrogen. The order of soil organic carbon and total nitrogen storage in 0-75 cm layer was natural renewal forest man-led forest artificial regeneration forest. 【Conclusion】Different regeneration patterns have different effects on soil carbon and nitrogen. The decline of soil carbon and nitrogen contents was significant in artificial regeneration forest and the topsoil was the most sensitive and the fastest decline, whereas the drop of them was slowly in natural renewal forests.更多还原