Soil Organic Carbon Fractions in Cultivated Calcareous Soils

IF 1.4 4区农林科学 Q4 SOIL SCIENCE Eurasian Soil Science Pub Date : 2024-02-20 DOI:10.1134/s1064229323603220

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Abstract

Soils play an important role in the balance of carbon on the global scale. The study of the carbon cycle in Calcareous soils has received less attention, while Calcareous soils cover a third of the world’s soils and most croplands of Iran. The aim of this study was to investigate soil organic carbon fractions and the relationship of soil organic carbon (SOC) with soil properties in 30 wheat farms of Calcisols of Alborz, Iran. To study the effects of soil geochemical properties, the data were subjected to cluster analysis to select samples with similar texture and low salinity. We applied a densimetric method using sodium iodide (NaI) to isolate light fraction (LF < 1.6 g/cm³), occluded fraction (OF < 1.8 g/cm³), and mineral-associated organic matter (MAOM > 1.8 g/cm³) of selected soils. Results showed that SOC decreased up to 61% throughout the soil profile. Mineral-associated organic matter had the highest proportion (more than 75%) of SOC in agricultural soils. The mean value of C/N reduced in mineral-associated organic matter compared to that of bulk soil, which indicates nitrogen concentration in this fraction. The study of soil properties suggested that calcium carbonate equivalent (CCE) could explain SOC content in calcareous soils, while extracted metals (iron, magnesium, and calcium) had a significant relationship with the organic carbon content of heavy fraction.

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种植的石灰性土壤中的土壤有机碳组分

摘要土壤在全球碳平衡中发挥着重要作用。虽然全球三分之一的土壤和伊朗的大部分耕地都是石灰性土壤，但对石灰性土壤碳循环的研究却很少受到关注。本研究旨在调查伊朗阿尔伯兹地区 30 个钙质土壤小麦农场的土壤有机碳组分以及土壤有机碳（SOC）与土壤特性的关系。为了研究土壤地球化学性质的影响，我们对数据进行了聚类分析，以选出质地相似且盐度较低的样本。我们使用碘化钠（NaI）密度测定法分离出所选土壤中的轻组分（LF < 1.6 g/cm3）、闭锁组分（OF < 1.8 g/cm3）和矿物相关有机质（MAOM > 1.8 g/cm3）。结果表明，在整个土壤剖面中，SOC 的降幅高达 61%。在农业土壤中，矿物相关有机质占 SOC 的比例最高（超过 75%）。与块状土壤相比，与矿物相关的有机质的 C/N 平均值有所降低，这表明这部分土壤中的氮浓度较高。对土壤特性的研究表明，碳酸钙当量（CCE）可以解释石灰性土壤中的 SOC 含量，而提取的金属（铁、镁和钙）与重质土壤中的有机碳含量有显著关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Eurasian Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

35.70%

发文量

137

审稿时长

12-24 weeks

期刊介绍： Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences. Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.