地中海灌木林管理对土壤碳捕获的影响
María González-Morales1, Mª Ángeles Rodríguez-González1, Daniel Paredes1
1Environmental Resources Analysis (ARAM) Research Group, University of Extremadura, 06006 Badajoz, Spain.
iScience
|July 30, 2025
概括
在伊比利亚半岛,森林灌木区的土壤有机碳 (SOC) 比没有树木的地区要多得多. 保持混合树木和灌木覆盖对于促进碳储存和缓解气候变化至关重要.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生态生态学 生态生态学
背景情况:
- 土壤有机碳 (SOC) 捕获对于减缓气候变化和土壤健康至关重要.
- 地中海生态系统面临着碳储存的独特挑战和机会.
- 了解土地管理对SOC的影响对于可持续实践至关重要.
研究的目的:
- 评估不同的管理系统,特别是有树木的灌木地 (WS) 与没有树木的灌木地 (S),如何影响SOC封存.
- 确定地中海生态系统中SOC水平的关键环境预测因素.
- 通过可持续的土地管理,为增强碳捕获提供见解.
主要方法:
- 在伊比利亚半岛WS和S生态系统的108个土壤样本中量化SOC.
- 利用通用添加混合模型 (GAMMs) 来分析 SOC 和环境变量之间的关系.
- 评估了植被覆盖面 (如Quercus rotundifolia,Retama sphaerocarpa) 和土壤特性的影响.
主要成果:
- 与S (37.4 g/kg) 相比,WS (67.9 g/kg) 的SOC水平显著更高.
- 规范差异植被指数 (NDVI) 和阴离子交换能力 (CEC) 是SOC的显著预测因素 (p=0.015和p<0.001).
- SOC在NDVI梯度上增加了36.7%,在CEC范围上增加了178.4%,这表明与植被生物质和土壤肥力有正相关性.
结论:
- 混合的树木和灌木覆盖显著提高了地中海景观中的SOC封存.
- 森林再生和有机修正等可持续实践可以进一步提高碳储存潜力.
- 保持多样化的植被结构对于最大限度地提高土壤碳捕获和支持减缓气候变化努力至关重要.
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