Seasonal and interannual variations of soil heterotrophic respiration and autotrophic respiration in subtropical forests of southeast China: independent process-based models.

IF 4 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geoscience Letters Pub Date : 2025-01-01 Epub Date: 2025-06-21 DOI:10.1186/s40562-025-00399-1

Yibo Yan, Xiujun Wang, Georg Wohlfahrt, Ni Huang

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引用次数: 0

Abstract

Soil respiration consists of two distinctive components: heterotrophic respiration (decomposition of soil organic matter) and autotrophic respiration (CO₂ production from root system), which are driven by different factors. However, the absence of process-based independent models for the two components hampers our ability to accurately quantify and understand the key carbon sources on land. Here, we used observational data to develop independent models for both soil heterotrophic and autotrophic respiration in the subtropical forests of southeast China, and validated the models using independent field data. Applying the validated models, we estimated both soil heterotrophic respiration and autotrophic respiration at three forest sites over 2002-2022. Our results showed higher annual rates of heterotrophic respiration (0.8-1.6 g C m^-2 day^-1) than autotrophic respiration (0.5-0.8 g C m^-2 day^-1). There was significant seasonality and inter-annual variability in both components, with larger variations in autotrophic respiration. The inter-annual variation was strongest in the winter season for both two respiration components. We found a significant (p < 0.01) increasing trend in autotrophic respiration (with a slope of 2.0-6.0 g C m^-2 year^-2) but not in heterotrophic respiration over 2002-2022. There was also a significant increasing trend in total soil respiration (3.4-6.2 g C m^-2 year^-2 for slopes), indicating an increasing role of autotrophic respiration. Our results reveal the dynamic nature of soil heterotrophic respiration and autotrophic respiration and their differing responses to environmental changes, emphasizing the need for independent models to improve the understanding of soil CO₂ sources in a changing climate.

Supplementary information: The online version contains supplementary material available at 10.1186/s40562-025-00399-1.

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中国东南部亚热带森林土壤异养呼吸和自养呼吸的季节和年际变化：基于独立过程的模型

土壤呼吸由异养呼吸（土壤有机质分解）和自养呼吸（根系产生二氧化碳）两部分组成，它们受不同因素的驱动。然而，缺乏基于过程的两个组成部分的独立模型阻碍了我们准确量化和理解陆地上关键碳源的能力。本文利用观测资料建立了中国东南部亚热带森林土壤异养和自养呼吸的独立模型，并利用独立的野外数据对模型进行了验证。应用验证过的模型，我们估算了2002-2022年三个森林样地的土壤异养呼吸和自养呼吸。我们的研究结果显示异养呼吸（0.8-1.6 g C - m-2 day-1）的年速率高于自养呼吸（0.5-0.8 g C - m-2 day-1）。两组分均存在显著的季节性和年际变化，其中自养呼吸变化较大。两组分的年际变化均以冬季最强。在2002-2022年期间，我们发现异养呼吸显著（p -2年），但没有。土壤总呼吸也有显著增加的趋势（坡地为3.4 ~ 6.2 g C m-2），表明自养呼吸的作用日益增强。我们的研究结果揭示了土壤异养呼吸和自养呼吸的动态性质及其对环境变化的不同响应，强调了在气候变化中需要建立独立的模型来提高对土壤CO2源的认识。补充资料：在线版本包含补充资料，下载地址：10.1186/s40562-025-00399-1。

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来源期刊

Geoscience Letters Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

4.90

自引率

2.50%

发文量

审稿时长

25 weeks

期刊介绍： Geoscience Letters is the official journal of the Asia Oceania Geosciences Society, and a fully open access journal published under the SpringerOpen brand. The journal publishes original, innovative and timely research letter articles and concise reviews on studies of the Earth and its environment, the planetary and space sciences. Contributions reflect the eight scientific sections of the AOGS: Atmospheric Sciences, Biogeosciences, Hydrological Sciences, Interdisciplinary Geosciences, Ocean Sciences, Planetary Sciences, Solar and Terrestrial Sciences, and Solid Earth Sciences. Geoscience Letters focuses on cutting-edge fundamental and applied research in the broad field of the geosciences, including the applications of geoscience research to societal problems. This journal is Open Access, providing rapid electronic publication of high-quality, peer-reviewed scientific contributions.