植物石的形成及其对内蒙古草原土壤有机碳封存的贡献,在长期沉积下
Shuo Li1, Liangchao Jiang2, Guojiao Yang3
1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Journal of environmental management
|May 3, 2025
概括
沉积通过提高生产率来增加植物的碳捕获,但从N添加的土壤酸化是保留这种碳的关键. 长期的受精有利于富含的植物,增强植物体遮的碳储存.
科学领域:
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
- 植物科学 植物科学
背景情况:
- (N) 沉积会影响植物生长和土壤营养平衡,可能会影响 (Si) 的吸收.
- 对于植物的形成和植物遮蔽碳 (PhytOC) 封存至关重要.
- 了解N沉积对PhytOC的影响对于碳捕获和生态系统功能至关重要.
研究的目的:
- 调查长期 (N) 添加对内蒙古草原中植物石遮蔽碳 (PhytOC) 生产和土壤PhytOC-SOC比率的影响.
- 确定植物群落生产力,物种组成和土壤酸化在调节N沉积下的PhytOC动态中的作用.
主要方法:
- 从2014年至2020年进行了一项长期N添加实验,使用6个N速率 (0-50gN m−2 yr−1) 进行.
- 2015年,2019年和2020年收集了植物和土壤样本,以分析植物石含量,ANPP和PhytOC与SOC的比率.
- 使用统计分析来评估N添加率和持续时间对测量参数的影响.
主要成果:
- 添加N降低了植物植物质含量,但增加了地面净初级生产率 (ANPP),提高了植物PhytOC产量.
- 由于长期添加,土壤中植物性碳化合物与SOC的比率增加,这主要是由于土壤酸化造成的.
- 长期的N暴露有利于Si丰富的物种 (例如,中国),增加了它们的统治地位并促进了PhytOC的生产.
结论:
- 植物群落的生产力和富含Si的物种是N沉积下的植物PhytOC生产的关键驱动力.
- 土壤pH受到N添加的影响,通过影响土壤植物溶性来调节PhytOC封存.
- 对于评估碳池稳定性来说,PhytOC非常重要,尤其是在正在进行的沉积和化肥实践中.
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