AUTHORS’ CONTRIBUTIONS
Morrison and Roche formulated and designed the study, planned the statistical analyses, interpreted the results, outlined the introduction and discussion, edited all drafts, and responded to review comments. Morrison was responsible for plot installation and treatments, collection of leaf samples and field data, leading the statistical analysis, and writing most sections of the paper. Roche participated in statistical analysis and interpretation and wrote sections of the paper. Veatch-Blohm conducted the chemical analyses and wrote the methods for that part. All authors gave final approval for publication.