植物学报

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华北落叶松根茎叶碳氮磷含量及其化学计量学特征的季节变化

赵亚芳1,2, 徐福利1,3*, 王渭玲3, 王玲玲3, 王国兴3, 孙鹏跃3, 白小芳1,2   

  1. 1中国科学院水利部水土保持研究所, 杨凌 712100;
    2中国科学院大学, 北京 100049
    3西北农林科技大学, 杨凌 712100
  • 收稿日期:2014-04-24 修回日期:2014-06-29 出版日期:2014-09-01 发布日期:2014-07-02
  • 通讯作者: 徐福利

Seasonal Variation in Contents of C, N and P and Stoichiometry Characteristics in Fine Roots, Stems and Needles of Larix principis-rupprechtii

Yafang Zhao1,2, Fuli Xu1,3*, Weiling Wang3, Lingling Wang3, Guoxing Wang3, Pengyue Sun3, Xiaofang Bai1,2   

  1. 1Institute of Soil and Water Conservation, Ministry of Water Resources, Chinese Academy of Sciences, Yangling 712100, China

    2University of Chinese Academy of Sciences, Beijing 100049, China; 3Northwest A&F University, Yangling 712100, China
  • Received:2014-04-24 Revised:2014-06-29 Online:2014-09-01 Published:2014-07-02
  • Contact: Fuli Xu

摘要: 以秦岭20年生华北落叶松(Larix principis-rupprechtii)人工林为研究对象, 对其不同季节细根、茎(干)和针叶中的碳(C)、氮(N)、磷(P)含量以及生态化学计量学特征进行了分析。结果表明, 根、茎和叶中C含量在生长季节内呈先升高再降低而后又升高的变化趋势, 3种器官C含量从大到小依次为茎>针叶>细根; N含量呈波动式变化; 针叶和细根中P含量均呈“降低→升高→降低→相对稳定”的变化趋势, 茎中P含量则呈先降低后升高又逐渐降低的变化趋势, N和P含量均依次为针叶>细根>茎。在华北落叶松整个生长季(5–10月), 细根和针叶中均为全N含量变异性最大, 茎中则为P含量的变异系数最大, 3种器官中C含量的变异性均最小。华北落叶松3种器官中C:N和C:P的季节变化趋势与各器官N、P含量的变化规律相反。N:P值在茎中最高, 在细根中最低。整个生长季中C:N的变异系数从小到大依次为细根<茎<针叶, 而C:P和N:P的变异系数从小到大的排序均为细根<针叶<茎。生长季节与不同器官对华北落叶松C、N、P含量及其计量比影响的交叉分析显示, C、N和P含量及C:N的变异主要受不同器官的影响, C:P和N:P的变异则主要受不同器官和生长季节的交互作用影响。细根C:N:P质量比(369:7:1)与针叶(309:10:1)相近。细根C、N和P的生态化学计量特征相对稳定, 不受生长季节的影响, 可用于生态系统问题的分析。

Abstract: We collected 20-year-old Larix principis-rupprechtii from a plantation in Qinling to explore the contents of C, N and P and their ecological stoichiometry characteristics in fine roots, stems and needles in different seasons. The content of C increased first, then decreased and increased again throughout the growing season (May to October). The order of the mean content of C in organs was stems > needles > fine roots. The content of N in fine roots, stems and needles tended to fluctuate during the growing season. The content of P in both needles and fine roots decreased first, then increased and decreased again, then remained stable. The content of P in stems decreased first and then increased, then decreased gradually. The order of the mean content of both N and P in organs was needles > fine roots > stems. The content of N had the greatest variability in fine roots and needles throughout the growing season. The coefficient of variation (cv%) of P was greatest for stems. The variability of C in the 3 organs was the smallest. The changes in C:N and C:P ratios were opposite to that of corresponding N, P content in fine roots, stems and needles. The ratio of N:P peaked in stems and was minimal in fine roots. The order of the cv% for C:N throughout the growing season was fine roots < stems < needles and for both C:P and N:P was fine roots < needles < stems. Factorial analysis of variation for each parameter, with sampling season and organs as independent variables, showed that the content of C, N and P and C:N mass ratio mainly depended on the organ. C:P and N:P mass ratios were mainly determined by the interaction of organs and season. The mass ratio of C:N:P was similar in fine roots (369:7:1) and needles (309:10:1). The characteristics of C, N and P stoichiometry were relatively stable in fine roots. Quantitative characteristics in fine roots were affected less in different seasons in L. principis-rupprechtii in Qinling, which helps in analysis of the ecological system.

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