...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Near-neutral carbon dioxide balance at a seminatural, temperate bog ecosystem
【24h】

Near-neutral carbon dioxide balance at a seminatural, temperate bog ecosystem

机译：半天然温带沼泽生态系统中的二氧化碳平衡接近中性

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 majority of peatlands in the temperate zone is subjected to drainage and agricultural land use and have been found to be anthropogenic emission hot spots for greenhouse gases. At the same time, many peatlands receive increased atmospheric nitrogen (N) deposition by intensive agricultural practices. Here we provide eddy covariance measurements determining net ecosystem carbon dioxide (CO_2) exchange at a protected but moderately drained ombrotrophic bog in Northwestern Germany over three consecutive years. The region is dominated by intensive agricultural land use with total (wet and dry) atmospheric N deposition being about 25 kg Nha~(-1) yr~(-1). The investigated peat bog was a small net CO_2 sink during all three years ranging from -9 to -73 g Cm~(-2) yr~(-1). We found temperature- and light-dependent ecosystem respiration (Reco) and gross primary production, respectively, but only weak correlations to water table depths despite large interannual and seasonal variability. Significant short-term effects of atmospheric N deposition on CO_2 flux components could not be observed, as the primary controlling factors for N deposition and C sequestration, i.e., fertilization of adjacent fields as well as temperature and light availability, respectively, exceeded potential interactions between the two.
机译：温带地区的大部分泥炭地都经过排水和农业用地，被发现是人为排放温室气体的热点。同时，许多泥炭地通过集约化农业实践获得了增加的大气氮（N）沉积。在这里，我们提供了涡动协方差测量，用于确定连续三年在德国西北部受保护但排水适中的营养养护沼泽中的净生态系统二氧化碳（CO_2）交换。该地区以密集的农业用地为主，大气中的总氮（湿和干）沉积量约为25 kg Nha〜（-1）yr〜（-1）。所研究的泥炭沼泽在过去三年中的净净CO_2量在-9至-73 g Cm〜（-2）yr〜（-1）之间。我们发现温度和光照分别依赖于生态系统的呼吸（Reco）和初级总产值，但尽管年际和季节之间存在较大的变化，但与地下水位深度的相关性很小。不能观察到大气氮沉积对CO_2通量成分的重大短期影响，因为氮沉积和碳固存的主要控制因素（即相邻场的施肥以及温度和光的可利用性）超过了氮之间的潜在相互作用。他们俩。

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