Current Earth System Models Overestimate Ecosystem Respiration in Mid-To-High Latitude Dryland Regions

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Dongxing Wu, Shaomin Liu, Bin He, Ziwei Xu, Xiuchen Wu, Tongren Xu, Xiaofan Yang, Jiaxing Wei, Zhixing Peng, Xiaona Wang
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Abstract

The inhibition of foliar respiration by light is a crucial yet often overlooked component in estimating ecosystem respiration. However, current estimations of the light inhibition of ecosystem respiration are biased by ignoring the effects of moisture factors. We developed a novel physics-constrained machine learning method to quantify the extent of light inhibition (Reli) driven by multiple factors in global ecosystems. Our findings revealed significant seasonal variations in light inhibition rate aligned with vegetation growth. Temperature predominantly influenced variations in Reli, and the temperature-Reli relationship was regulated by vapor pressure deficit rather than soil water content. A reassessment of global ecosystem respiration revealed that current Earth system models (ESMs) overestimate ecosystem respiration in mid-to-high latitude dryland regions, with a global average light inhibition strength of 0.51 (±0.16). Knowledge from this study provides an accurate understanding of light inhibition driven by temperature and moisture coupling in simulating carbon cycle.

Abstract Image

当前的地球系统模型高估了中高纬度干旱地区的生态系统呼吸作用
在估算生态系统呼吸作用时,光对叶面呼吸作用的抑制是一个至关重要但却经常被忽视的因素。然而,目前对光抑制生态系统呼吸作用的估算由于忽略了水分因素的影响而存在偏差。我们开发了一种新颖的物理约束机器学习方法,以量化全球生态系统中由多种因素驱动的光抑制(Reli)程度。我们的研究结果表明,光抑制率与植被生长的季节性变化密切相关。温度是影响光抑制率变化的主要因素,温度与光抑制率的关系受水汽压差而非土壤含水量的调节。对全球生态系统呼吸作用的重新评估表明,目前的地球系统模型高估了中高纬度干旱地区的生态系统呼吸作用,全球平均光抑制强度为 0.51 (±0.16)。这项研究的知识有助于准确理解在模拟碳循环过程中由温度和湿度耦合驱动的光抑制作用。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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