...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant and Soil >Growth and physiological responses of trembling aspen (Populus tremuloides), white spruce (Picea glauca) and tamarack (Larix laricina) seedlings to root zone pH
【24h】

Growth and physiological responses of trembling aspen (Populus tremuloides), white spruce (Picea glauca) and tamarack (Larix laricina) seedlings to root zone pH

机译：颤抖的白杨（Populus tremuloides），白云杉（Picea glauca）和tamarack（Larix laricina）幼苗对根区pH的生长和生理响应

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

Soil pH is among the major environmental factors affecting plant growth. Although the optimum range of soil pH for growth and the tolerance of pH extremes widely vary among plant species, the pH tolerance mechanisms in plants are still poorly understood. In this study, possible mechanisms were examined to explain the differences in tolerance of boreal plants to root zone pH. In the controlled-environment solution culture experiments, we compared growth, physiological parameters and tissue nutrient concentrations in aspen, white spruce and tamarack seedlings that were subjected to 8 weeks of root zone pH treatments ranging from 5.0 to 9.0. The pH treatments had little effect on dry weights and net photosynthesis in white spruce seedlings despite reductions in transpiration rates at higher pH levels. In aspen and tamarack, both the growth and physiological parameters significantly decreased at pH higher than 6.0. The chlorosis of young tissues in aspen and tamarack was associated with the reductions in foliar concentrations of several of the examined essential nutrients including Fe and Mn. Although the plants varied in their ability to deliver essential nutrients to growing leaves, there was no direct correlation between tissue nutrient concentrations, chlorophyll concentrations and plant growth. The results also demonstrated strong inhibition of transpiration rates by high pH. The results suggest that high root zone pH can upset water balance in pH sensitive species including aspen. Although the uptake and assimilation of essential elements such as Fe and Mn contribute to plant tolerance of high soil pH, we did not observe a direct relationship between growth and foliar nutrient concentrations to account for the observed differences in growth.
机译：土壤pH值是影响植物生长的主要环境因素之一。尽管植物的最佳土壤pH范围和对极端pH的耐受性在植物物种之间差异很大，但对植物的pH耐受机制仍然知之甚少。在这项研究中，研究了可能的机制来解释北方植物对根区pH的耐受性差异。在受控环境溶液培养实验中，我们比较了白杨，白云杉和柳幼苗的生长，生理参数和组织养分浓度，这些幼苗接受了从5.0到9.0的根区pH处理8周。 pH处理对白云杉幼苗的干重和净光合作用几乎没有影响，尽管在较高pH值下蒸腾速率降低了。在白杨和塔玛拉克中，pH高于6.0时，生长和生理参数均显着下降。白杨和塔玛拉克年轻组织的萎黄症与某些被检查的必需营养素包括铁和锰的叶面浓度降低有关。尽管植物向生长中的叶片提供必需养分的能力各不相同，但组织养分浓度，叶绿素浓度与植物生长之间没有直接关系。结果还证明了高pH对蒸腾速率的强烈抑制。结果表明，高根区pH可以破坏包括白杨在内的pH敏感物种的水分平衡。尽管对诸如Fe和Mn等基本元素的吸收和吸收有助于植物对高土壤pH的耐受性，但我们并未观察到生长与叶面养分浓度之间存在直接关系，无法解释观察到的生长差异。

著录项

相似文献

  • 外文文献
  • 中文文献
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