相关的和碳动力学揭示了深层,经过气候变化的岩石基层树脂层中独特的池和模式
Kelsey L Crutchfield-Peters1,2, Daniella M Rempe3, Alison K Tune3
1Department of Integrative Biology, University of California, Berkeley, CA 94720.
概括
森林依赖于,这是一个关键的营养素. 这项研究揭示,循环延伸到经过气候变化的岩基深处,由植物根系驱动,影响森林生产力.
科学领域:
- 森林生态 森林生态
- 生物地质化学生物地质化学
- 土壤科学 土壤科学
背景情况:
- 是全球森林生产力的关键限制营养素.
- 最近的发现表明,生态系统利用了经过气候变化的岩石基层的水.
- 这引发了有关循环延伸到这些深层区域的问题.
研究的目的:
- 为了研究一个16米的化基岩瓦多斯区 (WBVZ) 中的动力学,在一个老生长森林下面.
- 为了确定根源驱动的循环在土壤层以下的程度.
- 分析深度,季节和降水对度的影响.
主要方法:
- 使用专用仪器监测两年内1.5米间隔至16米深度的总溶解 (TDN),溶解有机碳 (DOC),无机和气体 (CO2,O2).
- 收集了16米高的风化基岩瓦多斯区 (WBVZ) 的数据.
- 分析了DOC的碳同位素组成.
主要成果:
- 总溶解 (TDN) 度随着深度的增加而显著增加,在15米处比表面高出一个数量级.
- 在WBVZ内,大多数TDN是有机的,来自植物来源,而不是基岩.
- TDN度受到深度,季节和年间降水模式的影响.
结论:
- 气候变化的岩基瓦多斯区 (WBVZ) 中的动力学可以受到土壤下方数米的活跃根系球的显著影响.
- 经过气候变化的基岩地平线在生态系统中的碳- (C-N) 循环中发挥着至关重要的作用,这些生态系统具有根深蒂固的植物.
- 这些发现强调了在森林营养循环中考虑深层地下环境的重要性.
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