Abstract
The vegetation mosaic of the Alaskan taiga is produced by patterns of disturbance coupled to well-defined successional patterns. In primary succession on river floodplains, one of the critical transitions in succession is that from thinleaf alder (Alnus tenuifolia) to balsam poplar (Populus balsamifera). This is the shift from a N2-fixing shrub to a deciduous tree. Through this transition there are major changes in N cycling including a decrease in N2-fixation, mineralization, and nitrification. Most models of plant effects on soil processes assume that these changes are caused by shifts in litter quality and C/N ratio. This paper reviews several studies examining the effects of balsam poplar secondary chemicals on soil nutrient cycling. Balsam poplar tannins inhibited both N2-fixation in alder, and decomposition and N-mineralization in alder soils. Other poplar compounds, including low-molecular-weight phenolics, were microbial substrates and increased microbial growth and immobilization, thereby reducing net soil N availability. Thus, substantial changes in soil N cycling through succession appear to have been mediated by balsam poplar secondary chemicals.
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Schimel, J.P., Cates, R.G. & Ruess, R. The Role of Balsam Poplar Secondary Chemicals in Controlling Soil Nutrient Dynamics through Succession in the Alaskan Taiga. Biogeochemistry 42, 221–234 (1998). https://doi.org/10.1023/A:1005911118982
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DOI: https://doi.org/10.1023/A:1005911118982