Global associations between alien abundance and nonlinear native–alien richness patterns across space and time

''All_data.RData'' – Raw input dataset containing final_dt with temporal records at study–plot level.''Time_hierarchical_cleaning.R'' – Run this script to check temporal consistency and filter records at study and plot levels, generating `cleaned_dataset_final.RData `.''Plot_level_temporal_resampling.R'' – Run this script to perform plot-level stratified temporal resampling and generate `Data.RData ` for subsequent analysis and calculations.