洛阳市农田土壤碳汇规律研究

doi:10.11720/wtyht.2025.2325

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Abstract

This study investigates the spatial distribution characteristics, temporal changes, and influencing factors of total carbon density, organic carbon density, and reserves in the farmland soils in Luoyang City based on repeated sampling data from multi-purpose regional geochemical survey points over different periods. The results indicate that in 2005, the topsoils in the multi-purpose survey area exhibited an average total carbon content of 1.57%, an average total carbon density of 44.74 t/hm², an average organic carbon content of 1.12%, and an average organic carbon density of 34.27 t/hm². With annual average increases in the total carbon density and organic carbon density of 0.709 t/hm² and 6.643 t/hm², respectively, this year witnessed increases in the total carbon and organic carbon of 41.73 kg/(hm²·a) and 390.75 kg/(hm²·a), respectively. The respective reserves of total carbon and organic carbon were 12.511 3 million tons and 8.879 59 million tons, with respective increases of 198.28 thousand tons and 1.857 8 million tons. In 2018, the topsoils in the multi-purpose survey area displayed an average total carbon content of 1.18%, an average total carbon density of 34.27 t/hm², an average organic carbon content of 1.07%, and an average organic carbon density of 30.94 t/hm². With annual average increases in the total carbon density and organic carbon density of 9.642 t/hm² and 4.727 t/hm², respectively, this year witnessed increases in the total carbon and organic carbon of -2,410.5 kg/(hm²·a) and 1,181.75 kg/(hm²·a), respectively. The respective reserves of total carbon and organic carbon were 1.963 5 million tons and 1.772 61 million tons. The total carbon reserves in topsoils in the whole study area were 14.474 81 million tons, including organic carbon reserves of 10.652 2 million tons. The total carbon reserves decreased by 552.41 thousand tons, while the organic carbon reserve increased by 270.82 thousand tons. Overall, the study area experienced a total carbon decrease of 354.13 thousand tons and an increase in the organic carbon reserves of 2.128 62 million tons. The total carbon showed significant positive correlations with the contents of organic carbon, CaO, MgO, N, and P, the organic carbon displayed significant positive correlations with the contents of total carbon, N, and P, and there was a significant positive correlation between pH and the CaO content. Fertilization led to an increase in the organic carbon and total carbon contents in farmland soils, with total carbon being significantly affected by the CaO content. In the carbonate areas, alkaline soil environments exhibited carbon sink characteristics. In the southern regions with acidified soil environments, the decomposition of carbonates in soils led to carbon loss and reduced calcium content. The results of this study provide important scientific evidence for research on peak carbon dioxide emissions and carbon neutrality of Luoyang City.

Key words： Luoyang City farmland soil carbon sink organic carbon total carbon

Received: 19 July 2023 Published: 26 February 2025

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	Articles by authors
	Yan XIA
	Run-Tao WANG
	Qian-Qian DU
	Xi-Kuan WANG
	Hong-Jie Lyu
	Jin-Kai HOU
	Bing-Hui LI

Cite this article:

Yan XIA,Run-Tao WANG,Qian-Qian DU, et al. Carbon sink in farmland soils in Luoyang City, China[J]. Geophysical and Geochemical Exploration, 2025, 49(1): 215-228.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.2325 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I1/215

The scope of 1∶250,000 multi-target regional geochemical surveys in 2005 and 2018 and the repeated sampling sites in 2022 in Luoyang City

Statistics of sample analysis quality at different times

Content characteristics of pH, total carbon, organic carbon and CaO in soil of Luoyang City

Isograms of total carbon and organic carbon in different periods of soil in Luoyang City
a—multi-objective survey full carbon contour; b—full carbon contour of this survey; c—multi-objective investigation of organic carbon contours; d—this survey of organic carbon contours

Statistical table of change rate of total carbon and organic carbon content in soil of Luoyang City %

Distribution of total carbon, organic carbon, pH and CaO change rates in soil of Luoyang City

Correlation of total carbon, organic carbon, pH, main elements and oxide content in soil of Luoyang City

Correlation of the change rate between total carbon, organic carbon, pH, major elements and oxide in soil of Luoyang City

Characteristic values of total carbon and organic carbon density in soil of Luoyang City

Comparison of soil carbon density between the study area and domestic and foreign farmland

Characteristics of soil carbon density change in Luoyang City

Scale of carbon density change in soil of Luoyang City

Total carbon and organic carbon reserves in soil of Luoyang City

Change table of total carbon and organic carbon sink in farmland soil of Luoyang City

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