干旱影响土壤有机碳度和化学稳定性,由中国自然森林中不同的森林类型和土壤过程影响
Shan Xu1, Yuanxi Yang1, Guodong Sun1
1State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China; Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
The Science of the total environment
|June 15, 2024
概括
干旱影响土壤有机碳 (SOC) 度和顶层森林土壤的稳定性. 增加的干旱性增强了SOC在0-5厘米顶层的化学稳定性,影响了中国森林中的碳捕获.
科学领域:
- 林业林业 林业 林业 林业
- 土壤科学 土壤科学
- 环境科学 环境科学
背景情况:
- 森林土壤是重要的全球碳 (C) 储存库,对减缓气候变化至关重要.
- 了解土壤有机碳 (SOC) 度和稳定性驱动因素是评估森林C封存潜力的关键.
研究的目的:
- 调查中国森林土壤中的SOC度和化学稳定性.
- 探索不同森林类型和土壤深度的SOC度和稳定性的驱动因素.
- 阐明干旱度在调解SOC动态中的作用.
主要方法:
- 使用固态13C核磁共振光谱学量化SOC度和化学稳定性 (-O-和疏水性-疏水性比).
- 分析了来自中国65个自然森林遗址的顶部0-5厘米和5-10厘米的土壤层.
- 采用结构方程建模来确定驱动因素,包括土壤pH值,细菌多样性和干旱度.
主要成果:
- 在混合森林 (0-5厘米) 中,SOC度最高,而在针叶树林 (0-5厘米) 中,化学稳定性最高.
- 在森林类型之间的5-10厘米层中,没有发现SOC度或稳定性的显著差异.
- SOC度 (0-5厘米) 与土壤pH值和细菌多样性正相关;干旱性通过土壤pH间接影响了SOC度.
- 随着干旱,SOC的化学稳定性 (0-5厘米) 增加,这可能是由于森林类型组成,C组成,矿物质含量和细菌多样性.
结论:
- 干旱性显著影响中国森林土壤顶部0-5厘米的SOC度和化学稳定性.
- 结果突出了控制森林SOC度和稳定的独特机制,这对于预测森林SOC对气候变化的反至关重要.
- 这项大规模调查提供了对森林土壤C封存和气候调节的见解.
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