长期放弃农田显著增加了土壤中的植物石碳封存
Linjiao Wang1, Xiang Gao2, Maoyin Sheng3,4
1Institute of Karst Research, Guizhou Normal University, Guiyang, 550001, China.
Carbon balance and management
|July 4, 2025
概括
放弃农田增加了土壤的PhytOC积累,增强了碳汇. 这项在中国南部的研究表明,较长的放弃期导致了由植被变化驱动的显著PhytOC储存.
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:
- 植物石遮蔽的有机碳 (PhytOC) 对于陆地生态系统中稳定的碳封存至关重要.
- 由于城市化的结果,农田被遗弃,对土壤碳循环产生重大影响.
- 了解PhytOC放弃后的动态对于碳管理至关重要.
研究的目的:
- 调查土壤PhytOC积累在废弃的玉米田中的趋势和驱动因素.
- 量化放弃时间对PhytOC储存的影响.
- 为了阐明影响PhytOC变化的机制,以应对土地使用变化.
主要方法:
- 在中国南部山区,选定的玉米田被遗弃了0-30年.
- 分析了土壤的PhytOC含量和储存在0-15厘米的档案.
- 评估了土壤营养素 (C,N,P,Si) 和酶活动的变化.
主要成果:
- 土壤中PhytOC含量在0.39-1.49g·kg-1之间,储存时间在0.27-0.83t·hm-2.2之间.
- 随着放弃时间的延长,PhytOC的积累显著增加,特别是在30年后.
- 放弃改变了土壤的营养和酶活动,植被覆盖的变化主要推动了PhytOC的增加.
结论:
- 农田被遗弃增加了土壤的PhytOC积累,有助于碳捕获.
- 调查结果有助于评估碳捕获潜力和制定区域碳管理战略.
- 放弃后的植被恢复是PhytOC储存的一个关键因素.
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