土壤有机碳对城市化的动态反应:全球视角
Fangjin Xu1,2, Shuqing Zhao3, Shuangcheng Li1,2
1College of Urban and Environmental Sciences, Peking University, Beijing, China.
Global change biology
|November 13, 2024
概括
城市化显著影响土壤有机碳 (SOC) 库存,低和高的城市化强度导致减少. 人类活动是这些变化的主要驱动因素,特别是在干旱的气候中,需要有针对性的土壤管理策略.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 城市生态城市生态学
背景情况:
- 全球城市化正在迅速改变景观,影响土壤的特性.
- 土壤有机碳 (SOC) 库存对于土壤健康和气候调节至关重要.
- 城市化对SOC库存的确切全球影响仍然不完全理解.
研究的目的:
- 评估城市化对土壤有机碳库存的全球和国家影响.
- 区分自然因素和人类活动在SOC库存变化中的作用在城市化过程中.
- 分析土地利用变化和气候区对SOC动态的影响.
主要方法:
- 利用城市-农村梯度方法,在全球1公里范围内分析城市化强度 (UI).
- 将UI分为低 (025),中 (2575),高 (75100) 的阶段.
- 研究了不同气候区的八个代表城市的土地利用变化和SOC库存变化.
主要成果:
- 随着UI在低强度 (6.8%在30厘米,6.4%在100厘米) 和高强度 (5.4%在30厘米,3.2%在100厘米) 的增加,SOC库存下降.
- 人类活动是SOC库存变化的主要驱动因素 (98%的低UI,89%的中等UI).
- 土地利用转变与SOC变化有很强的相关性,特别是在城市核心附近和各种气候中.
结论:
- 城市化,特别是低强度和高强度的城市化,导致土壤有机碳储量减少.
- 人类活动和相关的土地利用变化是这些SOC减少的主要驱动因素.
- 有针对性的土壤管理策略对于加强城市土壤的碳捕获至关重要,特别是在干旱地区.
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