地中海裸土橄榄林土壤呼吸的时空异质性

IF 5.8 2区 农林科学 Q1 SOIL SCIENCE
Soil Pub Date : 2025-02-11 DOI:10.5194/soil-11-213-2025
Sergio Aranda-Barranco, Penélope Serrano-Ortiz, Andrew S. Kowalski, Enrique P. Sánchez-Cañete
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引用次数: 0

摘要

摘要。土壤呼吸(Rs)是陆地生态系统中重要的碳通量,了解这一二氧化碳释放过程及其驱动因素是全球变化背景下的一个重要课题。然而,在橄榄林等半干旱系统中,时空变异尚未得到广泛研究。在这项研究中,我们展示了在地中海一个带裸土的肥沃橄榄林中,使用6个自动室对Rs进行了整整一年的连续测量,并伴随着通过分解使用涡动相关(EC)技术测量的净生态系统交换(NEE)估算的模拟生态系统呼吸(Reco)。为了研究空间变异性,自动室均匀分布在树冠下(Rs under - tree)和小巷中心(Rs alley),除了测量橄榄树的角度变化外,还在几个手动运动中测量了两个位置之间的Rs梯度。结果表明,在年度计算中,undertree比Alley高3倍。在巷道的南侧发现了较高的Rs,并且在到达巷道中心之前观察到Rs呈指数衰减。这些空间变化被用来衡量生态系统尺度上的Rs,其年平衡比使用ec衍生模型估计的reo高1.6-2.3倍。树下的Rs占橄榄树林Rs的39%。在暖期橄榄树附近发现Q10值<1。在干旱期和长时间无雨后,检测到与降水事件相关的CO2排放爆发,特别是在巷子中,但通过ec衍生的呼吸模型无法准确检测到它们。我们指出了几种随时间变化的效应之间的相互作用,这些效应在林冠下与在林道中是不同的,并且用于估计Q10和Reco的公认模型没有考虑到这一点。这些结果表明,土壤呼吸及其相关因子具有高度的时空异质性,这是今后半干旱农业生态系统研究中必须考虑的问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial and temporal heterogeneity of soil respiration in a bare-soil Mediterranean olive grove
Abstract. Soil respiration (Rs) is an important carbon flux in terrestrial ecosystems, and knowledge about this CO2 release process and the drivers involved is a key topic in the context of global change. However, temporal and spatial variability has not been studied extensively in semi-arid systems such as olive groves. In this study, we show a full year of continuous measurements of Rs with six automatic chambers in a fertigated olive grove with bare soil in the Mediterranean accompanied by modeled ecosystem respiration (Reco) estimated by decomposing net ecosystem exchange (NEE) measured using the eddy covariance (EC) technique. To study spatial variability, the automatic chambers were distributed equally under the canopy (Rs Under-Tree) and in the center of the alley (Rs Alley), and the gradient of Rs between both locations was measured in several manual campaigns in addition to angular changes about the olive trees. The results indicate that Rs Under-Tree was 3 times higher than Rs Alley in the annual computations. Higher Rs was found on the southern face, and an exponential decay of Rs was observed until the alley's center was reached. These spatial changes were used to weigh and project Rs onto the ecosystem scale, whose annual balance was 1.6–2.3 times higher than the Reco estimated using EC-derived models. Rs Under-Tree represented 39 % of the Rs of the olive grove. We found values of Q10<1 in the vicinity of the olive tree in the warm period. Outbursts of CO2 emissions associated with precipitation events were detected, especially in the alley, during dry periods and after extended periods without rain, but they were not accurately detected by EC-derived respiration models. We point out an interaction between several effects that vary in time, that are different under the canopy than in the alleys, and that the accepted models for estimating Q10 and Reco do not consider. These results show high spatial and temporal heterogeneity in soil respiration and the factors involved, which must be considered in future works in semi-arid agroecosystems.
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来源期刊
Soil
Soil Agricultural and Biological Sciences-Soil Science
CiteScore
10.80
自引率
2.90%
发文量
44
审稿时长
30 weeks
期刊介绍: SOIL is an international scientific journal dedicated to the publication and discussion of high-quality research in the field of soil system sciences. SOIL is at the interface between the atmosphere, lithosphere, hydrosphere, and biosphere. SOIL publishes scientific research that contributes to understanding the soil system and its interaction with humans and the entire Earth system. The scope of the journal includes all topics that fall within the study of soil science as a discipline, with an emphasis on studies that integrate soil science with other sciences (hydrology, agronomy, socio-economics, health sciences, atmospheric sciences, etc.).
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