轻度至中度的长期牧场在北方温带草原的广泛气候梯度中增强了生态系统的碳
Edward W Bork1, Daniel B Hewins2, Eric G Lamb3
1Department of Agricultural, Food and Nutritional Science, University of Alberta, 4-10 Agriculture and Forestry Center, Edmonton, Alberta T6G 2P5, Canada.
The Science of the total environment
|June 19, 2023
概括
牧草草地可以增加生态系统的总碳储存,主要是土壤有机碳 (SOC) 和根. 这一发现支持可持续的放牧实践,在这些重要生态系统中增强碳捕获.
科学领域:
- 生态与环境科学 生态与环境科学
- 土壤科学 土壤科学
- 碳封存是一种碳封存技术.
背景情况:
- 草原是全球重要的生态系统,提供基本服务,包括碳储存.
- 畜牧放牧对草原碳动态的影响尚未完全理解.
- 了解这些动态对于有效的土地管理和气候变化缓解至关重要.
研究的目的:
- 研究畜牧放牧对各种草原生态系统组件中碳密度的长期影响.
- 分析北方温带草原在广泛的农业气候梯度上的放牧的影响.
- 在一个大区域范围内量化放牧的潜在碳储存效益.
主要方法:
- 在加拿大阿尔伯塔省的110个北方温带草原进行了一项研究,涵盖了广泛的农业气候梯度.
- 在活植物和死植物,垃圾,杂草和土壤有机碳 (SOC) 中测量碳密度,深度为30厘米.
- 利用结构方程模型来阐明将牧场与SOC增加联系起来的间接途径.
主要成果:
- 在放牧期间,生态系统的总碳含量比非放牧草地 (117.8 公) 高出 8.5% (127.8 公),主要是由于 SOC 和根的增加.
- 放牧减少了垃圾质量碳,但在所有气候中在顶部0-15厘米层增强了土壤有机碳 (SOC).
- 放牧的SOC增加间接与较高的尤迪科特生物质和改善的花粉状动物质量 (较低的C:N比率) 有关.
结论:
- 长期放牧可以增强草原的整体碳储存,特别是土壤有机碳.
- 可持续的牧场管理,包括轻到中等水平,对于最大限度地提高草原的碳捕集量是很重要的.
- 预计将在该地区约380万公的牧草草地上储存额外的1710万公碳.
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