在和限制的竞争假设下,植物对高CO2的反应2
Qing Zhu1, William J Riley1, Jinyun Tang1
1Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
概括
植物营养的策略显著影响未来的碳循环. 多元限制方法比利比格的最小定律更好地预测生态系统对营养变化和二氧化碳增加的反应.
科学领域:
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
- 气候科学 气候科学
背景情况:
- 未来的生态系统碳循环对于生物圈气候反至关重要.
- 在 (N) 和 (P) 限制下的植物营养吸收策略影响碳积累.
- 两个理论,利比格的最小定律 (LLM) 和多元限制 (MEL),模型N和P的限制.
研究的目的:
- 在E3SM模型中实施和比较LLM和MEL方法.
- 通过实地受精实验,评估陆地生态系统对N和P限制的反应.
- 评估不同营养限制理论对未来碳循环预测的影响.
主要方法:
- 在E3SM地球系统模型中实施LLM和MEL理论.
- 全球98个现场森林N或P受精实验的汇编和分析.
- 模型预测与观察到的植物对营养干扰的反应进行比较.
主要成果:
- 与LLM相比,MEL方法在捕捉观察到的植物对营养干扰的反应方面表现出更好的能力.
- 在预测对二氧化碳度升高的反应方面,LLM和MEL显示出显著的差异.
- 据MEL预测,到21世纪末,二氧化碳肥对净初级生产率的影响将增加两倍.
结论:
- 与LLM相比,MEL提供了对陆地生态系统对营养限制的反应的更准确的表示.
- 在MEL下,植物间接的营养获取 (N2固定,酸酶活性) 显著增强了CO2受精效应.
- 不同的营养限制策略对未来的碳和营养动态有着深刻而多样化的影响.
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