Research is being conducted on global long-term patterns of plant nitrogen availability, with studies examining the effects of nitrogen enrichment on various ecosystems, including meadows, forests, and shrublands. The findings suggest that nitrogen availability can have divergent effects on different communities, such as plants and nematodes, and can be influenced by factors like climate change and nitrogen deposition. The outcomes of these studies indicate complex relationships between nitrogen availability and ecosystem functioning, with potential implications for vegetation structure and composition.