热量和干旱事件改变了平衡CO2预算的生物能力在西南欧洲
R Segura-Barrero1, T Lauvaux2, J Lian3,4
1Sostenipra Research Group Institute of Environmental Sciences and Technology Universitat Autònoma de Barcelona (UAB) Barcelona Spain.
概括
气候变化影响生态系统净二氧化碳交换 (NEE). 虽然更长的生长季节增加了碳吸收,但增加的呼吸和热浪等极端事件对碳汇构成风险,特别是在潮湿的地区.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 生物地质化学生物地质化学
背景情况:
- 越来越多的高温和干旱事件的频率和强度威胁着生态系统.
- 在这些不断变化的气候条件下,生态系统净二氧化碳交换 (NEE) 存在不确定性.
- 土壤湿度在生态系统碳流中的作用需要进一步研究.
研究的目的:
- 调整植被光合作用和呼吸模型 (VPRM),以纳入土壤湿度对碳流的影响.
- 评估2001年至2022年西南欧洲NEE的时间变化.
- 了解极端高温和干旱对生态系统碳平衡的影响.
主要方法:
- 修改了VPRM,包括土壤湿度对生态系统总交换 (GEE) 和生态系统呼吸 (RECO) 的影响.
- 分析了使用调整模型在西南欧洲的NEE的时间变化.
- 量化了2022年热浪对碳净吸收的影响.
主要成果:
- 温度升温增加了GEE,但这在很大程度上被增加的RECO所抵消,导致碳汇净增长适度 (0.69 gC m-2 yr-1) 具有很高的变化.
- 2022年热浪显著降低了碳净吸收量91.7TgC (26.4%的下降).
- 干旱影响了温带湿地区的NEE年间变化,而不是地中海半干旱地区.
结论:
- 净碳汇很容易受到干燥趋势的影响,这可能会扭转积极的NEE趋势.
- 生态系统,特别是法国中央山脉等地区的耕地,显示出因气候变化而导致的碳汇回归的迹象.
- 持续监测和建模对于了解生态系统对气候极端反应至关重要.
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