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辽东山区不同森林类型生态化学计量特征

毕建华1,2,3,苏宝玲1,于大炮2,3,吴健2,3,曹琳琳1,2,3,代力民2,3,周莉2,3*#br#   

  1. (1沈阳大学, 生命科学与工程学院, 沈阳 110044; 2中国科学院森林生态与管理重点实验室, 沈阳 110161; 3中国科学院沈阳应用生态研究所, 沈阳 110016)
  • 出版日期:2017-11-10 发布日期:2017-11-10

Ecological stoichiometry of different forest types in mountainous region of eastern Liao-ning Province.

BI Jian-hua1,2,3, SU Bao-ling1, YU Da-pao2,3, WU Jian2,3, CAO Lin-lin1,2,3, DAI Li-min2,3, ZHOU Li2,3*#br#   

  1. (1College of Life Science and Bioengineering, Shenyang University, Shenyang 110044, China; 2 Key Laboratory of Forest Ecology and Management, Chinese Academy of Sciences, Shenyang 110161, China; 3Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China).
  • Online:2017-11-10 Published:2017-11-10

摘要: 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。

关键词: 经验统计分析法, 植被恢复, 临界值, 彭冲涧小流域, 降水变化

Abstract: Stoichiometry plays an important role in elucidating the supply status and relationship of nutrient elements in ecosystems and in revealing the limiting factors that affect forest structure and function. The present study selected natural broadleaved mixed forest, Quercus mongolica forest, Pinus tabuliformis forest, Larix gemelinii plantation, and Pinus koraiensis plantation and investigated ecological stoichiometry characteristics and their difference among different forest types, through measuring the contents of carbon (C), nitrogen (N) and phosphorus (P) in leaves, litter, and soil. Our results showed that (1) the contents of C, N and P differed significantly among the five forest types, and those in leaves and litter were consistently higher than in the soil. In particular, N content was the highest in the natural broadleaved mixed forest and lowest in the Q. mongolica forest. (2) The rank of the C∶N and C∶P in the five forest types was litter>leaf>soil, while N∶P was leaf>litter>soil. The mean of leaf N∶P was 12.16, indicating that the growth of plants in this area might be limited by N. (3) The correlations in N, P, C∶N and N∶P were positively associated between leaves and litter, while N and C∶N in both leaves and litter were negatively correlated with those in the soil. These results suggest that the understanding of stoichiometry characteristics of nutrients in “plantlittersoil” is essential to reveal the nutrient status and the biochemical cycle of forest ecosystems.

Key words: Pengchongjian small watershed, vegetation restoration, critical value, precipitation variation, empirical statistics analysis method