由极端降雨引起的生产力分区变化增加了草原碳估计的不准确性
Jiamei Sun1,2, Yue Yan3, Bin Zhang4
1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
Global change biology
|July 5, 2024
概括
草原植物在降水量增加时,将较少的净初级生产率 (NPP) 分配给地下器官. 这一发现对于草原生态系统中精确的碳捕获建模至关重要.
科学领域:
- 生态生态学 生态生态学
- 全球变化生物学
- 生态系统科学 生态系统科学
背景情况:
- 净初级生产率 (NPP) 分配给地下器官 (BNPP) 是碳循环模型的关键.
- 了解降水对fBNPP的影响对于草原碳捕集估计至关重要.
- 缺乏长期数据和极端降水梯度,阻碍了对BNPP反应的理解.
研究的目的:
- 调查BNPP如何应对各种降水水平,从极度干旱到极度潮湿.
- 为了确定时间降水变化对草原碳捕获的影响.
- 为改善全球碳循环模型提供数据.
主要方法:
- 在内蒙古草原进行降水梯度实验 (100-500毫米).
- 在同一草原上利用了34年的长期观察研究.
- 进行了草原对降雨反应的全球元分析.
主要成果:
- fBNPP随着降水量增加,从干旱到潮湿的情况线性下降.
- 地上核电站对降水极端的反应比地下核电站更强烈.
- 全球元分析证实,随着降水量减少,BNPP的f增加,反之亦然.
结论:
- 草原植物调整分配策略,在干旱期间增加地下投资,在潮湿期间增加地面投资.
- 随着降水量增加,fBNPP的线性下降应纳入碳捕获模型.
- 准确的建模需要将这种BNPP反应纳入其中,以防止草原碳库的低估/高估.
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