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气候变暖引起的植被变绿可能会加剧全球土壤水平
Wenzhe Guo1, Maodian Liu1,2, Qianru Zhang1,3
1Ministry of Education Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Environmental science & technology
|August 14, 2024
概括
气候变暖可能会增加土壤中的含量,特别是在温带地区,这可能会影响食物网和人类健康. 单独的排放控制可能不足以抵消这种反循环.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 气候科学 气候科学
背景情况:
- 是一种全球性神经毒素,主要通过大气沉积和植物衰变储存在土壤中.
- 土壤中的可以被重新调动,重新进入大气和水,从而影响其全球循环.
- 气候变暖可能会加速的重新调动,可能会增加它在食物网中的存在.
研究的目的:
- 为了量化全球土壤储存.
- 为了研究土壤含量对气候变暖的反应的地理空间反.
- 评估排放控制在缓解全球变暖引起的反方面是否足够.
主要方法:
- 利用最新的土壤测量和基于观察的模型来估计全球土壤.
- 采用基于过程的生物地球化学建模来分析循环模式.
- 在预计的变暖情景下,分析了在特定温带地区的潜在增加.
主要成果:
- 在0-100厘米土壤中储存的全球估计为4.3 Tg (IQR:2.5-6.3 Tg).
- 预计由于植被变绿,气候变暖将增加土壤中的含量,特别是在东亚,北欧和北美 (到2100年,高于20 ng g-1),由于植被变绿.
- 基于观察的模型表明,单独的排放控制可能不足以抵消土壤的积极反.
结论:
- 气候变暖可能会加剧全球土壤水平,从而产生积极的反循环.
- 这种反可能会增强陆地海洋系统中的重新调动,增加人类暴露的风险.
- 持续减少温室气体和排放对于减轻这些风险至关重要.
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