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使用集成流域水文碳建模方法估计有机碳来源组成和河流流出

Yongyong Zhang¹, Jian Wu¹, Yang Gao¹

¹Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, PR China.

|March 28, 2025

概括

流域碳模型显示,大气沉积是有机碳的主要来源,大多数耐性碳在河流中转化为溶解和不稳定的形式. 这有助于控制水和碳损失的战略.

科学领域:

环境科学环境科学
生物地质化学生物地质化学
水文学的水文学

背景情况:

减少流域碳排放到海洋需要了解碳来源和运输.
土壤碳损失和通过水文循环运输的机制仍然不太清楚.
准确的碳分配和流出估计对于生态系统管理至关重要.

研究的目的:

开发和验证基于过程的流域有机碳模型.
估计碳来源,排放和它们的空间分布.
研究流域水文和碳循环的整合.

主要方法:

开发了一个基于过程的模型,整合了土壤生物地质化学,陆地损失和河流过程.
嵌入的水文过程驱动碳运输和新陈代谢.
利用长期现场观测流和有机碳负载在溪流域验证了该模型.

主要成果:

模型验证显示,排水和碳负载模拟的偏差最小 (偏差±0.25,R2>0.60).
大气沉积是主要的总有机碳 (TOC) 来源 (87.9%),其次是土壤损失.
耐性颗粒有机碳 (ROC) 主导着河流TOC负载 (88.7%),但河流外流主要包括不稳定的有机碳 (LOC) 和溶解的有机碳 (DOC) (97.5%).

结论:

相当一部分ROC通过河流代谢和沉积分解为LOC和DOC.
该模型为流域水文和碳循环整合提供了关键的见解.
这些发现有助于减轻水和碳损失的战略,增强陆地碳捕获.

关键词:

碳源组成碳源组成综合水文和碳模型.多种形式的多重形式.河流运输是河流运输.空间分布的空间分布溪流域的水分流是什么

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