• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecological research >Self-thinning lines of organs and aboveground parts based on allometric relationships in overcrowded Pinus densiflora stands
【24h】

Self-thinning lines of organs and aboveground parts based on allometric relationships in overcrowded Pinus densiflora stands

机译：过度拥挤的松果林基于异位关系的器官和地上部分的自稀疏线

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The allometric relationships of mean tree height H(∝w_x~θ) and of organ mass density d_x(∝ w_x~δ) to mean organ mass w_x were studied in self-thinning Pinus densiflora Sieb. et Zucc. stands. Tree height increased significantly with increasing mean mass of organs and aboveground parts on log-log coordinates. The value of the allometric constant θ ranged from 0.2878 to 0.3349. On the other hand, the constant value δ was not significantly different from zero, except for leaves. The value of the allometric constant δ ranged from -0.2926 to 0.0120. According to Weller's allometric model, the slope of the self-thinning line was calculated from the allometric constants θ and δ. The thinning slope was estimated to be -1.51 in stem, -1.39 in branches, -1.00 in leaf and -1.41 in aboveground parts, respectively. Mass density was high in stem, medium in branches and low in leaves. Mean leaf mass density decreased significantly with decreasing stand density on log-log coordinates, which could be interpreted as indicating the importance of the constant final leaf biomass in overcrowded P. densiflora stands. The self-thinning exponents of branch, stem and aboveground parts were not significantly different from 3/2, which indicated that the 3/2 power law of self-thinning holds for stem mass, branch mass and aboveground mass in overcrowded P. densiflora stands.
机译：在自稀疏松柏中研究了平均树高H（∝w_x〜θ）和器官质量密度d_x（∝w_x〜δ）与平均器官质量w_x的异形关系。 et Zucc。站立。在对数对数坐标上，树高随着器官和地上部分平均质量的增加而显着增加。异形常数θ的值在0.2878至0.3349的范围内。另一方面，除了叶片以外，常数值δ与零没有显着差异。异形常数δ的值在-0.2926至0.0120的范围内。根据Weller的异形模型，根据异形常数θ和δ计算出自细线的斜率。细化坡度估计在茎上为-1.51，在树枝上为-1.39，在树叶上为-1.00，在地上部分为-1.41。茎的质量密度高，枝中等，叶低。在对数-对数坐标上，平均叶片质量密度随着林分密度的降低而显着降低，这可以解释为表明在过度拥挤的P. densiflora林分中恒定的最终叶片生物量的重要性。树枝，茎和地上部分的自稀疏指数与3/2没有显着差异，这表明过度拥挤的P. densiflora林分的茎质量，分支质量和地上质量的3/2自稀疏幂律成立。 。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号