深厚的雪地覆盖增加了草原土壤的碳库存,通过将碳投入到深层土壤层中来增加碳
Meifeng Deng1,2, Ping Li1,2, Weixing Liu1,3
1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
Global change biology
|May 28, 2023
概括
较深的雪地覆盖显著增加了植物和微生物生物质,增加了土壤有机碳 (SOC) 库存. 这种效应在地下更为明显,突显了土壤深度在碳储存动态中的重要性.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 气候变化研究 气候变化研究
背景情况:
- 雪地覆盖的气候变化会影响土壤的微气候和水的可用性.
- 这些变化影响生物活动和碳循环,影响土壤有机碳 (SOC) 的分布.
- 有限的研究存在于雪盖对SOC库存和垂直SOC动态的影响.
研究的目的:
- 调查雪地覆盖的变化对SOC库存和土壤配置分布的影响.
- 评估雪深如何影响植物和微生物群落以及它们在碳动态中的作用.
- 了解控制SOC积累在地表土壤和地下土壤在不同雪地条件下的机制.
主要方法:
- 在内蒙古的570公里的气候梯度上建立了11个雪.
- 覆盖干旱,温带和草原的草原生态系统.
- 测量植物和微生物生物质,社区组成,SOC含量和土壤参数到60厘米深.
主要成果:
- 深雪增加了地面和地下植物生物质和微生物生物质.
- 增加的植物和微生物碳输入与草原SOC库存正相关.
- SOC积累在地下 (40-60厘米;+74.7%) 与深雪下的地表 (0-5厘米;+19.0%) 相比,在地下显著增加.
- 表面土壤中C的积累是由微生物和根生物质驱动的,而地下土壤的积累则受到增加的浸的影响.
结论:
- 地下表现出高碳捕集能力,通过在雪深的条件下,由地表土壤衍生的漏.
- 土壤深度对于评估气候变化对SOC动态的影响至关重要,地下可能比以前认为的更有反应性.
- 垂直碳运输在地下碳储存中发挥着关键作用,受到改变的雪制的影响.
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