• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecological research >How does fertility of the substrate affect intraspecific competition? Evidence and synthesis from self-thinning
【24h】

How does fertility of the substrate affect intraspecific competition? Evidence and synthesis from self-thinning

机译：底物的繁殖力如何影响种内竞争？自我思考的证据与综合

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

When dense populations of even-aged plant monocultures are subject to intense competition, mortality can occur in a process known as self-thinning, in which changes in biomass are accompanied by decreases in density. On a plot of log biomass versus log density, self-thinning populations show a linear relationship called the self-thinning line. Variations in the fertility level of the substrate are known to affect self-thinning in a number of ways. Populations from substrates with different fertility levels have been observed to self-thin along the same line, or along different lines. A review of several experiments using the one species grown at different fertility levels was undertaken to look for any mechanisms that might account for the different patterns observed. It was postulated that the critical difference between whether populations followed a common or different line was the way in which competition developed in the stands as biomass accumulated. For the common-line pattern, data on the canopy volume required to support a give'n biomass showed that biomass packing did not differ between fertility levels, supporting the model of a common competitive mechanism operating at all fertility levels. When different lines were observed, the development of competition differed as plants increased in size and biomass accumulated at each fertility level. Over the upper range of fertility levels, biomass packing values per plant increased as fertility declined and the position of self-thinning lines followed predictions from biomass packing data. At the low end of the fertility scale, biomass packing values still decreased with fertility level, but the position of self-thinning lines was not linked to the biomass packing of individual plants: root interactions were presumed to dominate competition and the trajectory of self-thinning lines.
机译：当密集种群的均匀衰老的植物单一培养物遭受激烈竞争时，死亡率可能会在称为自变薄的过程中发生，这种过程中生物量的变化伴随着密度的降低。在对数生物量与对数密度的关系图上，自稀化种群显示线性关系，称为自稀化线。已知基质的生育力水平的变化会以多种方式影响自我变薄。已经观察到来自具有不同生育水平的底物的种群沿着同一条线或沿着不同条线自稀。对使用在不同生育力水平下生长的一个物种的几个实验进行了回顾，以寻找可能解释所观察到的不同模式的任何机制。据推测，种群是遵循一条共同的路线还是不同的路线之间的关键差异是，随着生物量的积累，林分中竞争的发展方式。对于共线模式，支持给定生物量所需的冠层体积数据表明，生育力水平之间的生物量包装没有差异，这支持了在所有生育力水平下运行的常见竞争机制的模型。当观察到不同的品系时，竞争的发展随植物的大小和在每个生育水平上积累的生物量的增加而不同。在肥力水平的上限范围内，随着肥力的下降，每株植物的生物量包装值增加，并且自稀化系的位置遵循生物量包装数据的预测。在肥力规模的低端，生物量的堆积值仍随肥力水平的降低而下降，但是自稀系的位置与单个植物的生物量堆积没有联系：根系相互作用被认为是竞争和自交轨迹的主导。细线。

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