Soil organic matter interactions along the elevation gradient of the James Ross Island (Antarctica)

IF 5.8 2区 农林科学 Q1 SOIL SCIENCE Soil Pub Date : 2024-03-12 DOI:10.5194/egusphere-2024-607
Vitezslav Vlcek, David Juřička, Martin Valtera, Helena Dvořáčková, Vojtěch Štulc, Michaela Bednaříková, Jana Šimečková, Peter Váczi, Miroslav Pohanka, Pavel Kapler, Miloš Barták, Vojtěch Enev
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Abstract

Abstract. Around half of the Earth’s soil organic carbon (SOC) is presently stored in the Northern permafrost region. In polar permafrost regions, low temperatures particularly inhibit both the production and biodegradation of organic matter. In such conditions, abiotic factors such as mesoclimate, pedogenic substrate or altitude are thought to be more important for soil development than biological factors. In Antarctica, biological factors are generally underestimated in soil development due to the rare occurrence of higher plants and the short time since deglaciation. In this study, we aim to assess the relationship between SOC and other soil properties related to the pedogenic factors or properties. Nine plots were investigated along the altitudinal gradient from 10 to 320 m at the deglaciated area of James Ross Island (Ulu Peninsula) with a parallel tea-bag soil proteins (EE-GRSP; Spearman r = 0.733, P=0.031) and the soil buffer capacity (expressed as a ΔpH; Spearman r = 0.817, P=0.011). The soil available P was negatively correlated with altitude (Spearman r = -0.711, P=0.032) and the exchangeable Mg was negatively correlated to the content of rock fragments (Spearman r = -0.683, P=0.050)No correlation was found between the available mineral nutrients (P, K, Ca, Mg) and SOC nor GRSP. This may be a consequence of the inhibition of biologically mediated nutrient cycling in the soil. Therefore, the main factor influencing nutrient availability in these soils decomposition experiment. SOC contents showed a positive correlation with the contents of easily extractable glomalin-related seems to be not the biotic, but rather the abiotic environment influencing the mesoclimate (altitude) or the level of weathering (rock content). Incubation in tea bags for 45 days resulted in the consumption and/or translocation of more labile polyphenolic and water-extractable organic matter, along with changes in C content (increase of up to +0.53 % or decrease of up to -1.31 % C) and a decrease in the C:N ratio (from 12.5 to 7.1–10.2), probably due to microbial respiration and an increase in the abundance of nitrogen binding microorganisms. Our findings suggest that one of the main variables influencing SOC/GRSP content is not altitude or coarse fraction content (whose correlation with SOC/GRSP were not found) but probably other factors that are difficult to quantify, such as the availability of liquid water.
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詹姆斯罗斯岛(南极洲)海拔梯度上土壤有机物的相互作用
摘要目前,地球上大约一半的土壤有机碳(SOC)储存在北部永久冻土地区。在极地永久冻土地区,低温尤其会抑制有机物的产生和生物降解。在这种条件下,非生物因素(如中温带气候、成土基质或海拔高度)被认为比生物因素对土壤发育更为重要。在南极洲,由于高等植物极少出现,且降解时间较短,生物因素在土壤发育中的作用通常被低估。在这项研究中,我们旨在评估 SOC 与其他与成土因子或特性相关的土壤特性之间的关系。在詹姆斯罗斯岛(乌鲁半岛)的冰川退化地区,沿海拔从 10 米到 320 米的海拔梯度调查了九个地块,采用平行茶袋土壤蛋白质(EE-GRSP;Spearman r = 0.733,P=0.031)和土壤缓冲能力(以 ΔpH 表示;Spearman r = 0.817,P=0.011)。土壤可利用钾与海拔呈负相关(Spearman r = -0.711,P=0.032),可交换镁与岩石碎片含量呈负相关(Spearman r = -0.683,P=0.050)。这可能是土壤中生物介导的养分循环受到抑制的结果。因此,影响这些土壤养分供应的主要因素是分解实验。SOC 含量与易提取的谷胱甘肽含量呈正相关,这似乎不是生物因素,而是影响中间气候(海拔高度)或风化程度(岩石含量)的非生物环境因素。在茶包中培养 45 天后,更多易变的多酚类和水提取有机物被消耗和/或转移,同时 C 含量也发生了变化(C 含量最多增加 +0.53 % 或减少 -1.31 %),C:N 比值下降(从 12.5 降至 7.1-10.2),这可能是由于微生物呼吸作用和氮结合微生物数量的增加。我们的研究结果表明,影响 SOC/GRSP 含量的主要变量之一不是海拔或粗粒含量(未发现其与 SOC/GRSP 的相关性),而可能是其他难以量化的因素,如液态水的可用性。
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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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