We conducted a Meta-analysis with 264 datasets from 55 publications to investigate the effects of warming duration and intensity on plant carbon, nitrogen and phosphorus contents. The results showed that warming significantly reduced shoot carbon (effect value of -1.7%), root carbon (-4.0%), litter carbon (-3.7%), shoot nitrogen (-7.0%) and litter nitrogen contents (-6.4%). For different ecosystem types, warming significantly decreased shoot carbon (-0.8%), shoot nitrogen (-5.9%), root carbon (-7.4%), litter carbon (-2.1%), and litter nitrogen content (-13.4%) in grasslands, while significantly increased shoot carbon (2.7%) in scrublands and litter phosphorus content (42.4%) in forests. Short-term warming (<5 years) decreased shoot carbon (-0.4%), shoot phosphorus (-0.4%) and litter nitrogen (-13.4%) contents, while medium- to long-term warming (5-10 years) increased shoot carbon (0.6%), shoot phosphorus (20.2%) and litter nitrogen (6.2%) contents. The 0-2 ℃ warming intensity increased shoot phosphorus (10.1%) and root phosphorus (27.4%) contents of plants, while the >2 ℃ warming intensity decreased shoot phosphorus (-3.7%) and root phosphorus (-6.5%) content. The effect values of plant shoot carbon and shoot nitrogen were significantly and positively correlated with humidity index. Warming showed negative effects on plant carbon, nitrogen and phosphorus contents in terrestrial ecosystems, and such effects were moderated by the duration and intensity of warming.
本研究采用Meta分析方法,整合发表在全球的55篇文章的264组数据,研究增温时间和增温强度对植物碳、氮、磷含量的影响。结果表明: 增温显著降低植物地上碳(效应值为-1.7%)、地下碳(-4.0%)、枯落物碳(-3.7%)、地上氮(-7.0%)和枯落物氮(-6.4%)含量。在生态系统类型水平上,增温显著降低草地植物地上碳(-0.8%)、地上氮(-5.9%)、地下碳(-7.4%)、枯落物碳(-2.1%)和枯落物氮(-13.4%)含量,而显著增加灌丛植物地上碳(2.7%)和森林的枯落物磷(42.4%)含量。短期增温(<5年)降低植物地上碳(-0.4%)、地上磷(-0.4%)和枯落物氮(-13.4%)含量,而中长期增温(5～10年)增加植物地上碳(0.6%)、地上磷(20.2%)和枯落物氮(6.2%)含量。0～2 ℃增温强度增加植物地上磷(10.1%)和地下磷(27.4%)含量,而>2 ℃增温强度降低植物地上磷(-3.7%)和地下磷(-6.5%)含量。植物地上碳和地上氮的效应值与湿度指数呈显著正相关。增温对陆地生态系统植物碳、氮和磷含量均表现为负效应,且这种影响受增温时间和增温强度的调节。.
Keywords: Meta-analysis; ecosystem function; nutrient use efficiency; plant nutrient content; warming.