添加能增强了中国农田的土壤碳和营养动态:一个机器学习和全国性的合成
1Quality Foundation Development Institute of Xinjiang Uygur Autonomous Region, Urumqi, 831399, China.
Carbon balance and management
|June 19, 2025
概括
在中国,添加能增加了土壤有机碳和营养素.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 环境科学 环境科学
背景情况:
- (N) 的添加显著影响土壤有机碳 (SOC) 封存和农田的营养循环.
- 了解添加在各种环境条件下的空间变化和长期影响至关重要.
研究的目的:
- 评估添加对中国农田SOC和土壤关键营养素的影响.
- 评估气候区,肥料类型和受精持续时间对这些影响的影响.
- 开发一个高分辨率的国家数据集,预测土壤碳和营养素对N添加的空间反应.
主要方法:
- 综合了来自中国479个农田的数据.
- 应用机器学习模型来分析N添加对SOC,总 (TN),酸盐 (NO3−-N), (NH4+-N),C/N比率和可用的 (AP) 的影响.
- 评估了气候区,肥料类型和受精持续时间的影响.
主要成果:
- 添加N显著增加了SOC,TN,NO3-N,NH4+-N和AP,但没有影响C/N比率.
- 干旱地区的SOC捕获量更高;湿地区的营养积累量更大.
- 有机和综合肥料比化学肥料更有效.
- 长期的N输入 (>10年) 加剧了SOC储存和营养积累.
- 开发了一个高分辨率 (5公里) 的国家数据集,预测空间反应.
结论:
- 添加增强了中国农田的土壤碳和营养动态,具有显著的空间异质性.
- 肥料类型和气候区域极大地减轻了N添加的影响.
- 长期的应用是最大限度地提高土壤碳封存和营养效益的关键.
- 人工智能衍生数据集为优化N管理和中国精准农业提供了有价值的工具.
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