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确定潮沉积物中有机碳捕集的全球空间变异性的驱动因素

Mona Huyzentruyt¹, Jean-Philippe Belliard¹, Neil Saintilan²

¹University of Antwerp, ECOSPHERE, Universiteitsplein 1C, 2610 Antwerp, Belgium.

The Science of the total environment

|December 3, 2024

概括

潮会吸收大量的碳,但全球范围内的碳排放量各不相同. 诸如潮洪水,植被生产力和海平面上升等环境因素相互作用,控制这种重要的碳捕获过程.

科学领域:

环境科学环境科学
生态生态学生态生态学
地质科学是地球科学.

背景情况:

潮是高效的碳汇,全球平均沉积物有机碳积累率为210g C m-2 y-1.1.
沼泽碳捕集率存在显著的空间变化,在全球范围内范围为20至1700g C m−2 y−1.
以前的研究发现了一些环境驱动因素,但考虑了有限数量的变量.

研究的目的:

研究12个环境变量对沉积物有机碳含量,密度和潮积累率的影响.
为了分析全球477个潮沼泽地的大量数据集.
了解环境因素的复杂相互作用驱动碳捕集变异性的环境因素.

主要方法:

使用一个随机森林回归算法.
分析了来自全球477个潮沼泽地的数据.
检查了12个不同的环境变量的影响.

主要成果:

有机碳含量主要受到潮洪水变量 (潮范围和模式) 的影响;较高的潮范围与较低的碳含量相关.
有机碳密度随着沼泽植被的生产力和覆盖率的增加而增加,增强了碳输入和沉积物捕获.
有机碳的积累率主要受到海平面上升的控制,这对沉积物的积累产生了积极的影响.

结论:

潮沼泽碳封存的空间变化是由多个环境变量的复杂相互作用驱动的,而不是一个或几个.
潮洪水,植被动态和海平面上升是关键的相互作用因素.
了解这些相互作用对于预测和管理这些重要生态系统中的碳捕获至关重要.

关键词:

蓝色碳的封存方式沿海有植被的湿地.全球分析全球分析随机森林回归随机森林回归

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