Joshua Michael Shields

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Ecological filters and nutrient heterogeneity are important in the function of ecosystems. Herbaceous layers alter forest ecosystems by filtering tree species during early stages of tree reproduction and influencing nutrient cycling. Important aspects about how tree species successfully establish below and extend above this ecological filter are unanswered(More)
Intensive plantation management of high-value hardwoods, such as black walnut (Juglans nigra L.), is focused on maximizing both stem form and growth at the stand and tree level. While significant research has focused on genetic improvement in black walnut, little is known about the production ecology of this species in plantation settings. The aim of this(More)
Shields, Joshua M. Ph.D., Purdue University, December 2013. Effects of Amur honeysuckle (Lonicera maackii [Rupr.] Herder) invasion and removal on native vegetation and white-footed mice (Peromyscus leucopus) in mixed-hardwood forests of Indiana. Major Professor: Dr. Michael A. Jenkins. The threat of non-native invasive species continues to compromise the(More)
Underplanting tree seedlings in areas where natural regeneration is limited may offer a tool by which desired overstory composition can be maintained or restored in forests. However, invasive plant species and ungulate browsing may limit the effectiveness of underplanting, and in-turn, the successful restoration of forest ecosystems. Individually, the(More)
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