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长期变暖增加了潮湿的亚热带森林中的碳捕集能力
Xujun Liu1,2, Zhiyang Lie1,2, Peter B Reich3
1Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Global change biology
|January 26, 2024
概括
在亚热带森林进行了为期六年的变暖实验,发现生态系统的碳 (C) 储量最初减少,但随后显著增加. 这表明潮湿的亚热带森林在长期变暖下可能不会持续失去碳.
科学领域:
- 生态生态学 生态生态学
- 气候变化生物学 气候变化生物学
- 森林科学 森林科学 森林科学
背景情况:
- 热带和亚热带森林是关键的全球碳 (C) 池.
- 地球系统模型预测变暖对陆地C储量的不同影响,特别是在热带地区.
- 了解气候变暖下的森林C动态对于气候反预测至关重要.
研究的目的:
- 研究亚热带森林生态系统C动态对温和变暖 (2.1°C) 的长期 (6年) 反应.
- 在实验性变暖下,探索生态系统C种群变化背后的机制.
主要方法:
- 在中国南部的一个亚热带森林中使用中宇宙进行了生态系统级别的现场变暖实验.
- 跨越海拔梯度的转位中宇宙创造了2.1°C的温度差异.
- 在6年内监测生态系统C种群,植物生长,土壤呼吸,酶活性和微生物群落.
主要成果:
- 生态系统C库存最初在变暖的第一年减少了3.8%,但在第六年增加了13.4%.
- 增加的C库存是由持续的植物C积累 (高生长率) 和稳定的土壤C库存驱动的.
- 土壤C库存由于微生物的热适应,植物C输入增加和土壤干燥导致的C损失减少,保持稳定.
结论:
- 潮湿的亚热带森林C池在未来的长期变暖下可能不会持续减少.
- 随着时间的推移,植物和土壤C过程的差异和异步反应对于预测变暖影响至关重要.
- 目前的模型可能需要改进,以考虑这些复杂的,长期的生态系统反应.
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