TAILIEUCHUNG - Springer Old Growth Forests - Chapter 10

Chapter 10 Rooting Patterns of Old-Growth Forests: is Aboveground Structural and Functional Diversity Mirrored Belowground? When we think of old-growth forests, we generally imagine old forests with large trees and possibly a highly diverse forest structure resulting from the death of individual trees and the resulting | Chapter 10 Rooting Patterns of Old-Growth Forests is Aboveground Structural and Functional Diversity Mirrored Belowground Jurgen Bauhus Introduction When we think of old-growth forests we generally imagine old forests with large trees and possibly a highly diverse forest structure resulting from the death of individual trees and the resulting gap-phase dynamics Oliver and Larson 1996 Franklin et al. 2002 . This is also reflected in the definitions of old-growth forests see Chap. 2 by Wirth et al. this volume which normally do not refer to belowground structures and processes. This neglect of belowground aspects although intriguing is understandable since so little information is available. It is well known that the species richness and often also the biomass of invertebrates fungi and bacteria is much higher belowground than aboveground . Torsvik et al. 1990 yet we know very little about how their diversity and abundance belowground is related to forest age or forest structure. Carbon storage is an important value of old-growth forests and the carbon stored in soils forest floor and belowground biomass often approximates the quantities stored in aboveground biomass . Trofymow and Blackwell 1998 see Chap. 11 by Gleixner et al. this volume . The turnover of fine roots is believed to be an important driver of soil carbon accumulation yet little is know about how this process changes with forest age or forest developmental stages found in old-growth forests. Many of the attributes and values of old-growth forests are related to their aboveground structural diversity McElhinny et al. 2005 . It is therefore interesting to ask whether this structural diversity in old-growth forests is mirrored belowground and to what extent belowground structural diversity may contribute to functional diversity. To approach these questions I will ask firstly which attributes may comprise belowground structural diversity whereby the term belowground encompasses the substrates .

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