The contribution of rise in atmospheric CO2, climate change and nitrogen fertilization (including nitrogen deposition) trends on trends in potential productivity.

Note: TE4, TE5, TE6 and TE7 are productivity trends from simulation E4, E5, E6 and E7 respectively.The contribution of rise in atmospheric CO2, climate change and nitrogen fertilization (including nitrogen deposition) trends on trends in potential productivity.

注：TE4、TE5、TE6及TE7分别对应模拟试验E4、E5、E6与E7得到的生产力趋势。本分析旨在探讨大气二氧化碳（atmospheric CO₂）浓度升高、气候变化及氮肥施用（nitrogen fertilization，含氮沉降nitrogen deposition）趋势对潜在生产力变化趋势的贡献。