Global change progressively increases foliar nitrogen–phosphorus ratios in China's subtropical forests

Foliar nitrogen (N) to phosphorus (P) ratios (N/P) indicate N versus P limitation in terrestrial ecosystems. Quantifying the long-term dynamics of foliar N/P and their potential drivers is crucial for predicting nutrient status in forest ecosystems under global change. Using 1811 herbarium specimens collected during 1920-2010 in subtropical forests of China, we detected significant increases in foliar N/P (21.2%) and decreases in foliar P concentrations (23.1%). Foliar N/P increased more in evergreen species (22.9%) than in deciduous species (16.9%). Changes in atmospheric CO2 concentrations (Pco2), N deposition and mean annual temperature (MAT) dominantly contributed to the increased foliar N/P of evergreen species, while Pco2, MAT, and vapor pressure deficit, to that of deciduous species. Under future Shared Socioeconomic Pathway scenarios, increasing MAT would continuously increase foliar N/P by more than 6.5-26.0%. The results suggest that global change progressively and non-uniform..., , , # Data for: \"Global change progressively increases foliar nitrogen-phosphorus ratios in China’s subtropical forests\" By Yuan Lai *et al.* NOTE: 1\. The description and unit of each column can be found in the Sheet named \"colname\". 2\. Missing values were replaced with \"n/a\". Within the \"colname\" sheet, the character \"/\" represents no units.叶片氮（N）磷（P）比（N/P）可指示陆地生态系统的氮、磷养分限制状况。量化叶片N/P的长期动态及其潜在驱动因子，对于预测全球变化背景下森林生态系统的养分状态至关重要。本研究使用1920年至2010年间采集自中国亚热带森林的1811份蜡叶标本，检测发现叶片N/P显著提升21.2%，叶片P浓度下降23.1%。常绿树种的叶片N/P增幅（22.9%）高于落叶树种（16.9%）。大气CO₂浓度（Pco₂）、氮沉降与年平均气温（mean annual temperature, MAT）是驱动常绿树种叶片N/P升高的主要因子，而落叶树种叶片N/P升高的主导驱动因子则为Pco₂、MAT与水汽压亏缺。在未来共享社会经济路径（Shared Socioeconomic Pathway, SSP）情景下，年平均气温的升高将持续推动叶片N/P提升6.5%至26.0%以上。研究结果表明，全球变化正逐步且非均匀地……, , , # 数据来源：《全球变化逐步提升中国亚热带森林叶片氮磷比》 作者：Yuan Lai 等 注： 1. 各列的描述与单位可在名为"colname"的工作表中查阅。 2. 缺失值已替换为"n/a"。在"colname"工作表中，字符"/"代表无单位。