Rhododendron thickets alter N cycling and soil extracellular enzyme activities in southern Appalachian hardwood forests

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Hemlock woolly adelgid in the southern Appalachians: Control strategies, ecological impacts, and potential management responses (2013, background): “In areas where Rhododendron cover is substantial, regeneration of trees or other shrubs to fill-in the gaps created by hemlock mortality will be limited (Clinton and Vose, 1996; Hilles Ris Lambers and Clark, 2003; Wurzburger and Hendrick, 2007).”
Plant litter chemistry and mycorrhizal roots promote a nitrogen feedback in a temperate forest (2009, methodology): “In our previous work, tannin extracts from rhododendron foliage, leaf litter and roots were more astringent than those from hardwood species ( Wurzburger & Hendrick 2007 ).”
Hemlock Declines Rapidly with Hemlock Woolly Adelgid Infestation: Impacts on the Carbon Cycle of Southern Appalachian Forests (2009, background): “Replacement by R. maximum is also likely to enhance soil carbon due to the high tannin content of leaf and root litter, and reduce soil N availability to hardwood species ( Wurzburger and Hendrick 2007 ).”
Forest dynamics following eastern hemlock mortality in the southern Appalachians (2012, background): “Rhododendron inhibits growth and germination of other species by also reducing soil resources (Wurzburger and Hendrick 2007, 2009).”