...
  • 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 >Microscale soil structures foster organic matter stabilization in permafrost soils
【24h】

Microscale soil structures foster organic matter stabilization in permafrost soils

机译：微观土壤结构培养多年冻土土壤中的有机物质稳定性

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

Organic carbon (OC) stored in permafrost affected soils of the higher northern latitudes is known to be highly vulnerable to ongoing climatic change. Although the ways to quantify soil OC and to study connected C dynamics from ecosystem to global scale in the Arctic has improved substantially over the last years, the basic mechanisms of OC sequestration are still not well understood. Here we demonstrate a first approach to directly study micro scale soil structures mainly responsible for soil OC (SOC) stabilization using nano scale secondary ion mass spectrometry (NanoSIMS). A cross section from a permafrost layer of a Cryosol from Northern Alaska was analysed using a cascade of imaging techniques from reflectance light microscopy (RLM) to scanning electron microscopy (SEM) to NanoSIMS. This allowed for the direct evaluation of micro scale soil structures known to be hot spots for microbial activity and SOC stabilization in temperate soils. The imaging techniques were supported by classical soil analyses. Using this unique set of techniques we are able to evidence the formation of micro-aggregate structures in the vicinity of plant residues in permafrost soils. This clearly indicates biogeochemical interfaces at plant surfaces as important spheres for the formation of more complex soil structures in permafrost soils. Organo-mineral associations from these hot spots of microbial activity were recovered from plant residues (freeparticulate organic matter, fPOM) as fine grained mineral fraction with a typically low C/N ratio. This nicely illustrates the link between classical bulk analysis and state of the art spectromicroscopic techniques. (C) 2017 Elsevier B.V. All rights reserved.
机译：储存在多年冻土影响的有机碳（OC）较高北纬的土壤，众所周知，对持续的气候变化感到高度脆弱。虽然量化土壤oc和从生态系统研究与北极地区的全球规模的途径的方法已经大幅改善了，但在过去几年的基本上，OC封存的基本机制仍然无法清楚地理解。在这里，我们证明了一种直接研究微尺度土结构的方法，主要负责使用纳米级二次离子质谱（纳米粒子）的土壤OC（SOC）稳定。使用从反射光显微镜（RLM）的级联从反射光显微镜（RLM）级联的成像技术分析来自阿拉斯加北部的多年冻土层的横截面。这允许允许直接评估已知的微量尺度土壤结构，其热斑是微生物活性和温带土壤中的SoC稳定化。经典土壤分析支持成像技术。使用这一独特的技术，我们能够证明在多年冻土土壤中的植物残留物附近形成微聚集结构。这清楚地表明了植物表面的生物地质化学界面，作为形成更复杂的土壤中的形成更复杂的土壤结构的重要球体。从植物残基（自由颗粒有机物，FPOM）中回收来自这些热斑的有机矿物关联，用通常低C / N比的细粒矿物馏分回收。这很好地说明了经典散装分析与现有技术的谱系统的链路。 （c）2017 Elsevier B.v.保留所有权利。

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