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森林生态系统化学计量对于阐明养分元素在生态系统中的供应状况及其耦合关系,揭示影响森林结构与功能恢复的限制性因子具有重要作用。本研究以辽东山区主要森林类型——次生阔叶混交林、柞树林、油松林和落叶松人工林、红松人工林为研究对象,通过测定叶片、凋落物和土壤的C、N、P含量,分析了不同林型的化学计量特征及差异。结果表明:1)不同林型的C、N、P含量差异显著,且各林型叶片和凋落物C、N、P含量均大于土壤;其中阔叶混交林土壤N含量最高,而柞树林土壤N含量最低。2)5种林型C∶N和C∶P变化趋势均为凋落物>叶片>土壤,N∶P为叶片>凋落物>土壤;其中叶片N∶P平均值为12.16,表明该地区植物生长可能存在N限制。阔叶混交林和柞树林与油松林、落叶松林和红松林N∶P差异显著,前者受N、P共同限制,后者受N限制。3)辽东山区森林植被叶片与凋落物的N、P、C∶N和N∶P均表现为正相关关系,土壤与叶片和凋落物N、C∶N均呈负相关关系。本研究表明,理解养分元素在“植物-凋落物-土壤”之间的生态化学计量特征,对于揭示整个森林生态系统的养分状况和生物化学循环过程极为重要。
The stoichiometry of forest ecosystem plays an important role in elucidating the status of supply and coupling of nutrients in ecosystems and revealing the limiting factors that affect the restoration of forest structure and function. In this study, the main forest types - the secondary broadleaved mixed forest, the oak forest, the Pinus tabulaeformis forest, the Larix gmelinii plantation and the Pinus koraiensis plantation in the eastern Liaoning mountainous area were selected as the research objects. The contents of C, N and P in leaves, litter and soil Content, analysis of different forest types of stoichiometry and differences. The results showed that: 1) The contents of C, N and P in different forest types were significantly different, and the contents of C, N and P in leaves and litter were higher than those in soil. The content of N in the broad-leaved mixed forest was the highest, N content is the lowest. 2) The trend of C: N and C:P in five forest types was litter> leaf> soil and N:P was leaf> litter> soil. The average value of N:P in leaf was 12.16, indicating that the plant growth There may be N limits. Broadleaved mixed forest and oak forest and Pinus tabulaeformis forest, Larix gmelinii and Pinus koraiensis N:P significant difference, the former by the N, P common limit, the latter by the N limit. 3) N, P, C: N and N:P of forest vegetation in littoral zone showed a positive correlation with leaf litter and N, C:N in litter. This study shows that understanding the ecological stoichiometry of nutrient elements between “plant-litter-soil ” is extremely important for revealing the nutrient status and biochemical cycles of the entire forest ecosystem.