温暖,而不是干旱,仍然是限制碳封存的主要因素
Haoyu Xia1, Xia Xu1, Jiayu Xu1
1State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China; Faculty of Geographical Science, Beijing Normal University, Beijing, China.
The Science of the total environment
|October 13, 2023
概括
内蒙古的草原是碳汇,适应气候变化. 温暖化比干旱更多地限制了碳封存,这是由毛初级生产率 (GPP) 推动的.
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:
- 干旱/半干旱地区的草原生态系统对全球碳平衡至关重要,但对气候变化敏感.
- 控制季节性碳流应对气候变化的机制尚不清楚.
研究的目的:
- 在内蒙古草原 (2006-2021) 量化碳流.
- 调查气候因素对碳流的限制.
- 探索对温度和湿度变化的反应.
- 评估草原生态系统适应温度和干旱的情况.
主要方法:
- 用了旋共变量塔数据进行碳流量测量.
- 分析了气候因素 (温度,蒸汽压力不足,土壤含水量) 和碳流 (生态系统净生产率,毛初级生产率,生态系统呼吸) 之间的关系.
- 评估生态系统适应气候变化的战略.
主要成果:
- 草原生态系统作为一个碳汇 (73.55 g C m−2 yr−1),具有N形的年度积累模式.
- 温度和蒸汽压力缺陷 (VPD) 对净生态系统生产率 (NEP) 和总初级生产率 (GPP) 具有抛物线限制,具有最佳范围.
- 土壤水含量 (SWC) 减轻温度对碳捕获的负面影响.
- 总初级生产率 (GPP) 驱动生态系统适应温度和干旱,而不是生态系统呼吸 (RECO).
结论:
- 内蒙古的草原表现出适应变暖和干旱的能力.
- 气候变暖比干旱更显著地限制了碳捕获.
- 生态系统的适应主要由GPP驱动.
- 尽管适应,但在变暖的边界,草原仍然很脆弱,需要持续监测和研究.
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