...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Forest Planning >Does the Relationship between Quadratic Mean Diameter and Stem Density in Old Thinned and Unthinned Cryptomeria japonica Forests Deviate from a Power Function?
【24h】

Does the Relationship between Quadratic Mean Diameter and Stem Density in Old Thinned and Unthinned Cryptomeria japonica Forests Deviate from a Power Function?

机译：古老的稀疏和未稀疏柳杉粳稻林的二次平均直径与茎密度之间的关系是否偏离幂函数？

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

In approximately 100-year-old forest stands, we investigated whether the relationship between quadratic mean diameter (D_q) and stem density in thinned and unthinned stands (TV, and N_u) deviates from a power function. We also examined the effects ofchanges in stand leaf mass during stand development on the form of these two relationships. To answer these questions, we used data from 29 long-term experimental monitoring plots established in Japanese cedar (Cryptomeria japonica D. Don) plantations innortheastern Japan. In old thinned stands, the D_q~-N_1 relationship deviated from the power function, whereas the D_q~-N_u relationship in unthinned stands did not deviate from this function during the self-thinning period. These results were stronglyaffected by changes in total leaf mass with stand development. Comparison of stand development in unthinned and thinned forests indicated that thinning delayed forests from entering the self-thinning period, leading to an apparent rejuvenation effect.
机译：在大约有100年历史的林分中，我们调查了稀疏和未稀疏林分（TV和N_u）的二次平均直径（D_q）与茎密度之间的关系是否偏离幂函数。我们还研究了林分发育过程中林分叶片质量变化对这两种关系形式的影响。为了回答这些问题，我们使用了在日本东北部日本雪松（Cryptomeria japonica D. Don）人工林中建立的29个长期实验监测区的数据。在旧的稀疏林分中，D_q〜-N_1关系与幂函数偏离，而未稀疏林分中的D_q〜-N_u关系在自稀疏期间并未偏离此函数。这些结果受到随着林分发育的总叶片质量变化的强烈影响。比较未稀疏林和稀疏林的林分发育，表明稀疏延缓了森林进入自我稀疏期，从而产生了明显的复兴效果。

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