【摘要】 以长白山温带阔叶红松林为研究对象,通过野外采集土壤样品,综合研究老龄树及倒木对周边表层土壤性质的影响。研究结果显示,在本研究样地条件下,不同树种周边的表层土壤性质存在显著性差异,红松(Pinus koraiensis)周边土壤中水溶性有机碳WSOC的质量分数和特征吸光系数SUVA254值都高于紫椴(Tilia amurensis)和水曲柳(Fraxinus mandshurica),但是土壤水溶性总氮WSTN和交换性无机氮的质量分数却是红松低于紫椴和水曲柳。对倒木影响的森林表层土壤性质的研究结果显示,倒木下方森林表层土壤中WSOC、WSTN以及交换性矿质氮的质量分数都明显地高于林间土壤,说明在小尺度空间区域内,倒木可能是森林表层土壤活性碳、氮库的重要输入源。此外,本研究还利用主成分分析探讨了受树种影响的森林表层土壤不同性质之间的关联性,并对树种和倒木影响周边土壤性质的可能性机制进行分析。更多还原

【Abstract】 This paper focused on the temperate Korean pine and broad-leaved mixed forest of Changbai mountain,and investigated on the soil properties of forest floor influenced by old-growth trees or fallen trees in the direct vicinity.The results indicated that different tree species have significant effects on the soil properties of forest floor in current experimental plot.The water-soluble organic carbon(WSOC) and the specific ultra-violet absorbance(SUVA254) of forest soil in the vicinity of Pinus koraiensis were higher than that of Tilia amurensis and Fraxinus mandshurica;but as to water-soluble total nitrogen(WSTN) and exchangeable inorganic nitrogen,it was higher in Tilia amurensis and Fraxinus mandshurica,and lower in Pinus koraiensis.The study of soil properties of forest floor influenced by fallen trees indicated that forest soil under fallen tree had greater content of WSOC,WSTN and exchangeable inorganic nitrogen than that of forest soil in interstem-areas.The results suggested that the fallen trees would be important sources of active carbon and nitrogen of forest soil,at least in the small-scale space.Moreover,the relevance among soil properties influenced by different tree species was investigated by using principal component analysis,and the possible mechanism involved in soil properties affected by tree species and fallen trees in the direct vicinity was also discussed.更多还原