• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global change biology >Decomposition of secondary compounds from needle litter of Scots pine grown under elevated CO2 and O-3
【24h】

Decomposition of secondary compounds from needle litter of Scots pine grown under elevated CO2 and O-3

机译：在CO2和O-3升高下生长的苏格兰松针垫中次生化合物的分解

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

Elevated atmospheric carbon dioxide (CO2 ) and ozone (O-3 ) concentrations have both been shown to affect plant tissue quality, which in turn could affect litter decomposition and carbon (C) and nutrient cycling. In order to evaluate effects of climate change on litter chemistry, needle litter was collected from Scots pine (Pinus sylvestris L.) saplings exposed to elevated CO2 or O-3 concentration and their combination over three growing seasons in open-top chambers. The decomposition of needle litter was followed for 19 months in a pine forest. During decomposition, needle samples for secondary compound analysis were collected and the mass loss of needles was followed. Main nutrients and total phenolics were analysed from litter in the beginning and at the end of the experiment. After 19-month decomposition, the accumulated mass loss was about 34%; however, no significant differences were found in decomposition rates of needle litter between various treatments. Concentrations of total monoterpenes were about 4%, total resin acids 21% and total phenolics 14% of the initial concentrations in litter after 19-month decomposition. In the beginning of litter decomposition, concentrations of individual monoterpenes -alpha-pinene and beta-pinene - were significantly higher in needle litter grown under elevated CO2 . However, concentrations of total monoterpenes during the whole decomposition period were not significantly affected by CO2 or O-3 treatments. Concentrations of some individual and total resin acids were higher in needle litter grown under elevated CO2 or O-3 than under ambient air. There were no significant differences in concentrations of total phenolics as well as nitrogen (N) and the main nutrient concentrations between treatments during decomposition. High concentrations of monoterpenes and resin acids in needles might slightly delay C recycling in forest soils. It is concluded that elevated CO2 and O-3 concentrations do not have remarkable impacts on litter decomposition processes in Scots pine forests. [References: 55]
机译：大气中二氧化碳（CO2）和臭氧（O-3）的浓度升高均会影响植物组织质量，进而影响凋落物分解以及碳（C）和养分循环。为了评估气候变化对垫料化学的影响，针叶垫料从暴露在高浓度CO2或O-3浓度下的苏格兰松树（Pinus sylvestris L.）幼树中收集，并在三个生长季节的开放式密闭室中组合。在松树林中，针刺的分解进行了19个月。在分解过程中，收集用于次要化合物分析的针头样品，并跟踪针头的质量损失。在实验开始和结束时从垫料中分析主要养分和总酚。经过19个月的分解，累积质量损失约为34％。然而，在不同处理之间，针刺的分解率没有显着差异。分解19个月后，垃圾中总单萜的浓度约为初始浓度的4％，树脂酸总含量为21％，酚醛总含量为14％。在凋落物分解开始时，在二氧化碳浓度升高的情况下生长的针状凋落物中，单萜类化合物-α-pine烯和β-pine烯的浓度显着升高。但是，在整个分解过程中总单萜的浓度不受CO2或O-3处理的影响。在升高的CO2或O-3下生长的针刺凋落物中某些个别和全部树脂酸的浓度高于在环境空气中。分解过程中各处理之间的总酚，氮（N）和主要营养素浓度没有显着差异。针叶中的高浓度单萜和树脂酸可能会稍微延迟森林土壤中的碳循环。结论是，升高的CO2和O-3浓度对苏格兰松林凋落物分解过程没有显着影响。 [参考：55]

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