No depth-dependence of fine root litter decomposition in temperate beech forest soils

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• 作者：Emily F. Solly ; Ingo Sch?ning ; Nadine Herold ; Susan E. Trumbore…
• 关键词：Fagus sylvatica L ; Root litter ; Decomposition ; Soil depth ; Beech forests
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：393
• 期：1-2
• 页码：273-282
• 全文大小：454 KB
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• 作者单位：Emily F. Solly (1) (2)
  Ingo Sch?ning (1)
  Nadine Herold (1)
  Susan E. Trumbore (1)
  Marion Schrumpf (1)
  
  1. Max Planck Institute for Biogeochemistry, Hans-Kn?ll-Str. 10, 07745, Jena, Germany
  2. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Aims Subsoil organic carbon (OC) tends to be older and is presumed to be more stable than topsoil OC, but the reasons for this are not yet resolved. One hypothesis is that decomposition rates decrease with increasing soil depth. We tested whether decomposition rates of beech fine root litter varied with depth for a range of soils using a litterbag experiment in German beech forest plots. Methods In three study regions (Schorfheide-Chorin, Hainich-Dün and Schw?bische-Alb), we buried 432 litterbags containing 0.5?g of standardized beech root material (fine roots with a similar chemical composition collected from 2?year old Fagus sylvatica L. saplings, root diameter-lt;-?mm) at three different soil depths (5, 20 and 35?cm). The decomposition rates as well as the changes in the carbon (C) and nitrogen (N) concentrations of the decomposing fine root litter were determined at a 6?months interval during a 2?years field experiment. Results The amount of root litter remaining after 2?years of field incubation differed between the study regions (76?±-?% in Schorfheide-Chorin, 85?±-?% in Schw?bische-Alb, and 88?±-?% in Hainich-Dün) but did not vary with soil depth. Conclusions Our results indicate that the initial fine root decomposition rates are more influenced by regional scale differences in environmental conditions including climate and soil parent material, than by changes in microbial activities with soil depth. Moreover, they suggest that a similar potential to decompose new resources in the form of root litter exists in both surface and deep soils.