长期土地利用的变化改变了深层土壤微生物死体和有机碳稳定性的变化
Yuxin Yan1, Jia Shi1, Zhongmin Fan1
1Key Laboratory of Arable Land Conservation (North China), College of Land Science and Technology, China Agricultural University, Beijing, 100193, PR China.
Journal of environmental management
|May 1, 2025
概括
将天然草原转化为耕地显著减少了深层土壤有机碳 (OC). 然而,剩余的OC转向更稳定的形式,影响气候调节和可持续农业.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 气候变化研究 气候变化研究
背景情况:
- 草原生态系统对于土壤有机碳 (OC) 封存和气候变化缓解至关重要.
- 自然草原转化为农业用地影响深层土壤的碳稳定性和矿物化.
- 了解土地利用转换后OC池的变化对于气候调节至关重要.
研究的目的:
- 研究土壤有机碳 (OC) 池在地表土壤和深层土壤中的分布和稳定.
- 评估自然草原的长期农业转型对深层土壤碳稳定性和矿物化的影响.
- 为了解决围绕深层土壤OC矿化在不同土地用途下的不确定性.
主要方法:
- 在上层土壤 (0-20厘米) 和深层土壤 (80-100厘米) 中土壤有机碳 (OC) 池的比较.
- 经过11年和40年的农业耕地从自然草原转换后的分析.
- 研究与矿物相关的OC (MAOC),微生物死体C和溶解有机碳 (DOC) 的回性.
主要成果:
- 在转换后,深层土壤中的散装OC大幅减少 (从44.70gkg−1降至8.76-6.22gkg−1).
- 矿物相关OC (MAOC) 和微生物死体C的贡献增加,表明转向更稳定的OC形式.
- 表面土壤中溶解有机碳 (DOC) 的回性增加,深土MAOC中形碳的增加.
- 与草原相比,农业土壤的OC矿化率较低,但温度敏感性 (Q10) 较高.
结论:
- 农业转型显著改变深层土壤的OC含量和稳定性.
- 农业土壤中发生了转向更稳定的OC形式的转变,尽管整体OC损失.
- 调查结果强调了评估土地使用对深层土壤碳的长期影响对于气候调节和可持续农业的重要性.
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