...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geoderma: An International Journal of Soil Science >Spatial and temporal effects of nitrogen addition on root morphology and growth in a boreal forest
【24h】

Spatial and temporal effects of nitrogen addition on root morphology and growth in a boreal forest

机译：氮气添加对北方林根形态和生长的空间和颞效应

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

The production and turnover of fine roots play a critical role in regulating underground carbon (C) cycling of terrestrial ecosystems, which are a biological feature in regulating the capacity of plant to capture soil nutrients. Although the importance of fine root production (FRP) and turnover (FRT) to whole-plant and ecosystem C cycling is increasingly recognized, their response to nitrogen (N) deposition remains unclear. To understand how N addition affects the FRP and FRT of fine roots, a field experiment was conducted with four N treatment levels (0, 2.5, 5.0, and 7.5 g N m(-2) yr(-1)) to quantify the effects of N deposition on fine root dynamics and vertical allocation in a boreal forest using the minirhizotron technique. Our results showed that N deposition significantly decreased total number of live and dead fine roots and total surface area of live fine roots in topsoil layers (0-20 cm soil depth), while increased in subsoil layers (20-40 cm soil depth) during 2015-2016. Average diameter of fine root was increased by N addition particularly in subsoil layers. The FRP rate was reduced by N addition in the topsoil, but increased in the subsoil layers, whereas patterns of their seasonal changes were not affected in both soil layers. The FRT rate tended to decrease under N addition compared with control in both soil layers during the observation years, potentially indicating a slower underground C cycle with N addition. Moreover, fine roots distributed more deeply in the soil due to N addition, indicating fine roots may through self-regulation and change of growth strategy to face environment stressor.
机译：细根的生产和营业额在调节陆地生态系统的地下碳（C）循环方面发挥着关键作用，这是调节植物能力捕获土壤营养的生物学特征。尽管细根生产（FRP）和营业额（FRT）对全植物和生态系统C循环的重要性越来越识别，但它们对氮气（n）沉积的反应仍不清楚。要了解N个添加如何影响FRP和FRT的细根，用四个治疗水平（0,2.5,5.0和7.5g N m（-2）Yr（-1））进行现场实验，以量化效果用MILHIZOTRON技术在北方森林中对细根动力学和垂直分配的沉积。我们的研究结果表明，沉积显着降低了表土层（0-20厘米的土壤深度）的活细根总数和活良细根的总面积，同时在底层层（20-40厘米的土壤深度）中增加2015-2016。特别是在底土层中增加细根的平均直径。在表土中的N添加降低了FRP率，但在底层层中增加，而两种土壤层的季节性变化的模式不受影响。与在观察年内的土壤层中的控制相比，FRT速率趋于降低，与两种土壤层中的控制相比，可能表明较慢的地下C循环循环。此外，由于N添加，细根在土壤中更深地分布，表明细根可以通过自我调节和生长策略变化来面对环境压力源。

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