Trend analysis of methane uptake in 13 forest soils based on up to 24 years of field measurements in south-west Germany

IF 5.7 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 2025-09-10 DOI:10.1016/j.agrformet.2025.110823

Verena Lang , Valentin Gartiser , Peter Hartmann , Martin Maier

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Abstract

Methane (CH₄) plays a crucial role in global climate dynamics as a potent greenhouse gas. Forest soils are the most important terrestrial CH₄-sinks, yet long-term trends in CH₄-uptake remain underexplored, due to the lack of long-term field measurements on the same site. This study presents findings from a soil gas monitoring programme in 13 forest soils in south-west Germany of up to 24 years, which represents currently the worldwide largest dataset of continuous CH₄-fluxes. CH₄-uptake was calculated from soil gas profiles and validated through chamber measurements. CH₄-uptake ranged from 0.55 to 3.31 nmol m⁻s⁻¹ with significant site-specific variability, and was on average 1.40 ± 1.29 nmol m⁻² s⁻¹. Our analysis shows an increase in CH₄-uptake of 3% per year on average. During the observation period annual precipitation decreased and soil moisture as well, while soil temperatures increased, what we identified as the most probable explanation of the observed trend. The observed long-term trends in CH₄-uptake are in contrast to the latest studies. However, they perfectly agree in the explanation of the observed trend, which is the trend in local precipitation patterns, just that the local precipitation patterns followed different directions. Thus, this study demonstrates the value of long-term data sets as well as the importance climate projections that also include reliable precipitation predictions.

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基于德国西南部长达24年野外测量的13种森林土壤甲烷吸收趋势分析

甲烷（CH₄）作为一种强效温室气体在全球气候动力学中起着至关重要的作用。森林土壤是最重要的陆地ch4汇，但由于缺乏对同一地点的长期野外测量，对ch4吸收的长期趋势仍未充分探索。本研究介绍了德国西南部13个森林土壤长达24年的土壤气体监测计划的结果，这是目前世界上最大的连续ch4通量数据集。根据土壤气体剖面计算ch4吸收量，并通过室内测量进行验证。吸收ch4的范围从0.55到3.31 nmol m（⁻- 1），并有显著的地点差异，平均为1.40±1.29 nmol m（⁻- 2）。我们的分析表明，甲烷的吸收平均每年增加3%。在观测期内，年降水量减少，土壤湿度下降，土壤温度升高，这是观测趋势的最可能解释。观察到的ch4吸收的长期趋势与最近的研究相反。然而，对于观测到的趋势，即局部降水模式的趋势，他们的解释是完全一致的，只是局部降水模式遵循不同的方向。因此，本研究证明了长期数据集的价值以及包括可靠降水预测在内的气候预测的重要性。

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来源期刊

Agricultural and Forest Meteorology 农林科学-林学

CiteScore

10.30

自引率

9.70%

发文量

415

审稿时长

69 days

期刊介绍： Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.