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南京信息工程大学丨npj Clim. Atmos. Sci.丨北半球植被“闪速繁盛”现象及其驱动机制

  • 2026-04-27 17:21:30
南京信息工程大学丨npj Clim. Atmos. Sci.丨北半球植被“闪速繁盛”现象及其驱动机制

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1.文章背景

在全球气候变暖和大气CO₂浓度持续升高的背景下,陆地生态系统正呈现出更加剧烈和复杂的动态响应,传统以物候节点(SOS、POS、EOS)为核心的研究框架虽然揭示了生长季长度和峰值变化趋势,却难以捕捉生长季内部短时间尺度上的剧烈波动与快速转折。越来越多观测表明,植被在适宜气候条件下可能出现持续数周的快速生长跃升,这类突发式的冠层增强过程不仅显著提高短期碳吸收和生物量累积,也可能加速水分与养分消耗,进而影响后期生长稳定性与生态系统韧性。然而,这种短时高强度的快速“繁盛”现象在大尺度上的空间分布格局、长期变化趋势及其驱动机制仍缺乏系统认知。特别是在北半球中高纬度地区,气候变暖、辐射变化与CO₂施肥效应叠加,可能重塑植被生长节律与碳循环节奏。如果忽略这些快速跃迁过程,将难以准确评估生态系统对气候变化的响应敏感性,也可能低估其对未来碳汇稳定性和物候可预测性的影响。因此,有必要从生长速率和阶段动态出发,构建新的分析框架,系统揭示植被快速生长事件的时空特征及其环境驱动机制

2.创新之处

本研究突破了传统基于季节节点的物候分析范式,从生长速率和百分位跃迁角度界定“flash flourishing”这一快速冠层增强过程,构建了以速率阈值与持续时间为核心的识别框架,将植被动态由“时间节点描述”拓展为“阶段强度与加速度刻画”。通过整合五套卫星植被产品、TRENDY模型集合模拟以及FLUXNET通量观测数据,建立了观测—模型融合的多源交叉验证体系,实现了对北半球中高纬度地区快速生长事件的系统刻画。同时,在归因分析中区分CO₂施肥效应、大气变化与土地利用变化的贡献,揭示CO₂在长期增强趋势中的主导作用,以及温度与辐射在不同阶段的差异化调控机制。此外,将快速生长起始阶段特征引入物候预测模型,证明其对峰值绿度、POS与EOS具有较高前瞻预测能力,构建了从早期快速响应到整季物候演化的因果链条,为改进生态系统模型结构和提升生长季预测能力提供了新的思路。

3.重要结论

快速且短暂的植被生长跃升——以生长速率和持续时间阈值界定——是生态系统响应环境变化的重要但尚未充分研究的指标。本研究分析了2003—2022年北半球中高纬度地区(NEL)植被“闪速繁盛”事件的时空格局。结果表明,高纬度地区(≥45°N)的事件发生频率比中纬度地区高1.6倍,且过去二十年中频率、持续时间和强度均呈显著上升趋势,同时起始阶段、后期阶段及整个事件期间的植被指数均持续增强。模型模拟表明,多年尺度的增强趋势主要由大气CO₂浓度升高驱动,而温度和辐射则主导不同阶段的变率特征,其中起始阶段特征对后续物候响应具有较强预测能力。研究揭示了北半球植被闪速繁盛的空间格局及其驱动机制,强调了其对生态系统动态的广泛影响,并为改进生态系统模型和评估生态系统变化提供了重要依据

4.重要图表

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  1. CONNECT:[ UseTime:0.000356s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000520s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
  8. SELECT * FROM `article` WHERE `id` = 494864 LIMIT 1 [ RunTime:0.000443s ]
  9. UPDATE `article` SET `lasttime` = 1777286043 WHERE `id` = 494864 [ RunTime:0.001095s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000233s ]
  11. SELECT * FROM `article` WHERE `id` < 494864 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002400s ]
  12. SELECT * FROM `article` WHERE `id` > 494864 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000522s ]
  13. SELECT * FROM `article` WHERE `id` < 494864 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001029s ]
  14. SELECT * FROM `article` WHERE `id` < 494864 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000941s ]
  15. SELECT * FROM `article` WHERE `id` < 494864 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003336s ]
0.080027s