近自然毛竹林空间结构动态变化研究

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 近自然毛竹林空间结构动态变化 DOI: 10.5846/stxb201307081859 作者: 作者单位: 浙江农林大学环境与资源学院 临安,浙江农林大学环境与资源学院 临安,浙江农林大学环境与资源学院 临安,浙江农林大学环境与资源学院 临安,天目山国家级自然保护区管理局 临安 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金（31170595）；国家十二五科技支撑计划（2012BAD22B0503）；浙江省重点科技创新团队（2010R50030）；教育部留学回国人员科研启动金项目（20101561） Dynamic analysis of spatial structure in a close-to-nature Phyllostachys edulis stands Author: Affiliation: 浙江农林大学,浙江农林大学,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:2009年7月在浙江省天目山国家级自然保护区，建立了1块100 m×100 m的近自然毛竹林固定标准地，采用相邻网格法进行每竹调查，利用全站仪测量毛竹的三维坐标（X，Y，Z），结合2010-2012年的3次毛竹复查数据，利用角尺度、大小比数和年龄隔离度3个结构指数，分析毛竹林空间结构的动态特征。结果表明：天目山近自然毛竹林大小年现象明显，平均胸径逐年增加；空间分布格局特征表现为2009、2012年毛竹林呈随机分布，2010、2011年毛竹林呈聚集分布；各年份毛竹林角尺度均服从左偏近似正态分布，且各年份的角尺度无显著性差异（P > 0.05）；各年份毛竹林的平均大小比数均接近0.5，林分处于中庸状态；各年份毛竹林大小比数分布频率出现均衡分布特征，林分较稳定，且各年份间的大小比数无显著性差异；各年份毛竹林的年龄多样性及年龄隔离程度均较高；年龄隔离度逐年增加，毛竹小年向大年过渡期毛竹林年龄隔离度有显著性差异（P < 0.05），大年向小年的过渡期则无显著性差异。 Abstract:Moso bamboo (Phyllostachys edulis) forests are one of the most economic forests in China, and they possess a lot of advantages over other forest types, such as rapid growth, wide distribution, and high production. Traditional moso bamboo stand management involves a predatory management approach which focuses on economic benefits, blind pursuit the production of bamboo and bamboo shoots, and a lack of emphasis regarding the relationship between structure and function. Due to these reasons, this management leads to a series of problems such as soil degradation, increases in plant diseases and insect problems, the inability to withstand natural disasters, and environmental degradation. Thus, this suggests that the relationship between stand structure and function is a key factor to the sustainable management of these bamboo forests. Traditional descriptions of moso bamboo stand structure have focused on stand-level collective attributes such as density, species composition, and basal area. However, given a general lack of spatial information, non-spatial attributes are difficult to use for accurately estimating whole stand characteristics. The spatial structure of a forest can reflect environmental processes, such as competition, regeneration, spatial distribution, and mortality. These factors can affect the stability,the development, and the management of a stand. Therefore, forest spatial structure approach would involve spatial pattern, mingling, and competition. Information regarding bamboo forest spatial structure is necessary for stand structure optimization. Many static spatial studies have been conducted in bamboo forests, including mingling, spatial pattern, and competition, and so on. Compared with other types of forests, bamboo grows faster, and this provides the possibility to study the dynamic change rule of stand spatial structure. Previous studies had not yet shown the dynamic change of moso bamboo stand spatial structure. Therefore, three spatial structure parameters, uniform angle index, neighborhood comparison, and age mingling degree were used to analyze the moso bamboo stand spatial structure dynamics (change) from 2009 to 2012, and thus provide theoretical basis for sustainable moso bamboo forest management.In July of 2009, one 100 m×100 m standard plot was established in a close-to-nature Phyllostachys edulis stand in Tianmu Mountain National Nature Reserve, Zhejiang Province. The plot was divided into 100 units by adjacent grid inventory, and has been annually surveyed four times. Results showed that the moso bamboo stand has a clear on-year and off-year cycle, and the average diameter at breast height (dbh) increased gradually over year. The spatial pattern of the stand presents a random distribution in 2009 and 2012, but the 2010 and 2011 years showed an aggregation distribution pattern. The frequency distribution of uniform angle index of each year was described by a left-skewed normal distribution trend, and had no significant difference during these years (P > 0.05). The average neighborhood comparison values of each year were close to 0.5, suggesting that the stand has kept an intermediate status. The frequency distribution of neighborhood comparison of each year appeared to have a balanced trend, suggesting that the stand was in a stable state. However, the neighborhood comparison showed no significant difference of each year. The stand showed high age diversity and age isolation levels, and the age mingling value increased as the years increased. The age mingling in the transition period from on-year to off-year was significantly different (P < 0.05), but in the transition from off-year to on-year there was no significant difference. 参考文献 相似文献 引证文献