在草原和沙漠土壤中的无机碳池及其驱动因素
Longwei Dong1, Jinzhi Ran1, Jiali Luo1
1State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems (SKLHIGA), College of Ecology, Lanzhou University, Lanzhou, People's Republic of China.
Global change biology
|October 19, 2024
概括
土壤无机碳 (SIC) 对干旱地区至关重要. 沙漠储存的SIC比草原更多,在沙漠中占主导地位的石化碳酸盐和草原中占主导地位的石化碳酸盐,受到不同的环境因素的影响.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- 土壤无机碳 (SIC) 是土壤碳库存的重要组成部分,影响气候变化和生态系统功能.
- 干旱地区约占全球土壤无机碳池的80%.
- SIC的组成和环境驱动因素,特别是在沙漠和草原,仍未得到充分研究.
研究的目的:
- 调查中国西北部旱地生态系统中的土壤无机碳 (SIC) 的分布和组成.
- 要区分石化碳酸盐 (LIC) 和石化碳酸盐 (PIC) 以及它们对SIC的贡献.
- 确定控制SIC库存的环境因素及其对气候和生态系统过程的反应.
主要方法:
- 利用了来自中国西北部2.24亿公土地的173个地点的6011个土壤样本的综合数据集.
- 分析了土壤无机碳 (SIC) 的丰度和分布,区分了石化碳酸盐 (LIC) 和小物质碳酸盐 (PIC).
- 相关的SIC库存和构成与土壤母材料,海拔和自然酸化过程.
主要成果:
- 中国西北部的沙漠和草原含有大量的SIC种群 (顶部100厘米分别为20±2.5和5±1.3 petagram).
- 石质碳酸盐 (LIC) 在沙漠中占主导地位 (55%),而小物碳酸盐 (PIC) 在草原中普遍存在 (60%).
- 沙漠中的土壤母体材料和海拔控制LIC;自然酸化在草原中显著减少PIC.
结论:
- 干旱地区巨大的土壤无机碳 (SIC) 池在全球碳循环中发挥着至关重要的作用.
- 石化碳酸盐 (LIC) 和石化碳酸盐 (PIC) 在沙漠和草原生态系统中具有不同的分布和形成/损失机制.
- 了解自然酸化对于预测土壤无机碳 (SIC) 动态和草原中的潜在碳损失至关重要.
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