植物生态学报 ›› 2013, Vol. 37 ›› Issue (9): 811-819.DOI: 10.3724/SP.J.1258.2013.00085

• 研究论文 • 上一篇    下一篇

不同营林模式下毛竹枝叶的生物量分配: 异速生长分析

朱强根1, 金爱武1*, 王意锟1, 邱永华2, 李雪涛3, 张四海1   

  1. 1丽水学院, 浙江丽水 323000;
    2遂昌县林业局, 浙江遂昌 323300;
    3安吉县林业局, 浙江安吉 313300
  • 收稿日期:2013-05-28 修回日期:2013-07-12 出版日期:2013-09-01 发布日期:2013-09-02
  • 通讯作者: 金爱武
  • 基金资助:

    毛竹笋竹林测土推荐施肥技术推广与示范,中央财政林业科技推广项目

Biomass allocation of branches and leaves in Phyllostachys heterocycla ‘Pubescens’ under different management modes: allometric scaling analysis

ZHU Qiang-Gen1, JIN Ai-Wu1*, WANG Yi-Kun1, QIU Yong-Hua2, LI Xue-Tao3, and ZHANG Si-Hai1   

  1. 1Lishui College, Lishui, Zhejiang 323000, China;

    2Suichang County Forestry Bureau, Suichang, Zhejiang 323300, China;

    3Anji County Forestry Bureau, Anji, Zhejiang 313300, China
  • Received:2013-05-28 Revised:2013-07-12 Online:2013-09-01 Published:2013-09-02
  • Contact: JIN Ai-Wu

摘要:

植物枝、叶的异速生长关系受个体发育的限制, 同时还受到环境因素的影响。该研究应用异速生长分析方法探讨毛竹(Phyllostachys heterocycla ‘Pubescens’)枝、叶关系及其生物量分配策略对不同营林模式(钩梢和施肥)的响应。结果表明: 与不钩梢相比, 钩梢(相当于60%的修枝水平)后毛竹枝叶生物量均有显著的下降(枝40.23%、叶41.01%); 施肥显著增加了钩梢和不钩梢毛竹枝、叶生物量(不钩梢枝20.67%、叶46.53%; 钩梢枝19.71%、叶13.95%)。施肥显著改变了毛竹枝、叶异速生长的标准主轴(standardized major axis, SMA)斜率(施肥0.75 vs不施肥0.82; p < 0.05), 表现为与不施肥相比, 叶片的光合产物在施肥处理上相对更多地转移到枝上。钩梢后, 毛竹枝、叶异速生长的SMA斜率显著增加(钩梢1.09–1.10 vs不钩梢0.74–0.83; p < 0.000 1), 表现出钩梢引起更多的资源向叶片分配, 且在不施肥处理下, 这种效应更为强烈。光照因素导致了毛竹冠层枝、叶异速生长关系的差异, 并与施肥之间存在显著的交互效应。钩梢作为直接影响因素对毛竹枝、叶异速生长关系具有强烈的影响(p < 0.001), 导致枝、叶异速生长关系斜率变异接近50%, 而施肥或光照条件<10%, 表明枝、叶关系对不同环境或干扰因素的响应存在差异, 且间接因素(如施肥)的影响更多受到自身生长发育的限制。

Abstract:

Aims Allometric relationship between branch and leaf is limited by plant ontogeny and affected by environmental conditions, which is not well investigated in giant clone species such as Phyllostachys heterocycla ‘Pubescens’. Our objectives were to study the effects of different management modes (obtruncation and fertilization) on branch and leaf biomass allocations of P. heterocycla ‘Pubescens’ and to discuss the effects within canopy.
Methods Obtruncation is a particular pruning operation cutting off the top (about 40%–70% canopy) of P. heterocycla ‘Pubescens’. This management methods used in north Zhejiang of China to reduce trees falling from strong wind or heavy snow. A replicated 2 × 2 factorial experiment (obtruncation and fertilization) was established in Zhejiang Province in 2004. In 2010 and 2011, a total of 50 plants were cut down to investigate branch and leaf biomass, as well as leaf area of selected leaves within the canopy. Allometric scaling was applied to analyze the relation of branch and leaf biomass.
Important findings Averaged branch and leaf biomass for individual plant were decreased 40.23% and 41.01%, respectively, following obtruncation and increased 20.18% and 30.23%, respectively, following fertilization. Obtruncation severely changed the growth trajectory and resulted in a greater standardized major axis (SMA) slope, which indicated relatively more biomass was allocated to leaves. This was more significant under non-fertilization treatments. When compared to non-fertilization, fertilization significantly decreased SMA slope in unobtruncated trees, which was attributed to relatively larger leaf photosynthetic products partitioning to branches after fertilization. In addition, allocation patterns of branch and leaf biomass at different canopy parts were affected by light availability that was different in different fertilization treatments. Obtruncation changed SMA slope by nearly 50% and <10% for fertilization, which indicated that direct interference (obtruncation) easily changed the grown trajectory and indirect effects (fertilization) were more limited by plant ontogeny.