Influence of Irrigation on Vertical Migration of Soil Organic Carbon in Arid Area of Inland River

Wenhao Zhang, Guofeng Zhu (), Qiaozhuo Wan, Siyu Lu, Ling Zhao, Dongdong Qiu and Xinrui Lin
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Wenhao Zhang: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
Guofeng Zhu: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
Qiaozhuo Wan: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
Siyu Lu: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
Ling Zhao: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
Dongdong Qiu: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
Xinrui Lin: College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China

Land, 2023, vol. 12, issue 8, 1-14

Abstract: Soil organic carbon is very important to increase crop yield. Understanding the composition changes and migration characteristics of SOC under different irrigation conditions in arid oasis areas is of great significance for the sustainable development of agro-ecosystem and the estimation of carbon balance of farmland ecosystem in arid areas. In this paper, classical statistics and geostatistics were used to study the leaching characteristics and migration laws of soil organic carbon under different irrigation conditions in Minqin Oasis, and the leaching amount and loss process and mechanism of SOC under different irrigation conditions were quantified. The research results showed that: (1) Irrigation increased the average 0–100 cm SOC content. After irrigation, SOC content decreased first and then increased with the increase in soil depth, with the maximum value of 8.56 g/kg and the minimum value of 1.82 g/kg. Compared with that before irrigation, SOC content in 0–30 cm surface layer was in leaching state, SOC content in 30–70 cm surface layer was accumulated, and SOC content in 70–100 cm surface layer had no obvious change. (2) Water was an important factor affecting soil carbon. The greater the irrigation amount, the higher the carbon leaching rate and the greater the migration amount. The SOC content in 0–30 cm soil layer was most significantly affected by irrigation, and the migration amount of SOC gradually decreased with the increase in soil depth. The maximum leaching rate of SOC was 36.8%, the minimum leaching rate was 13.5%, and its average leaching rate was 23.4%. (3) Due to the influence of soil infiltration rate under water, SOC content in different irrigation periods showed that the greatest SOC occurred in the 0–70 cm layer, and SOC content in soil was basically the same as that in non-irrigated areas on the fifth day after irrigation. (4) Precipitation, plastic film mulching, soil physical and chemical properties and other environmental factors were important factors affecting the migration and change in SOC content.

Keywords: soil organic carbon; irrigation amount; migration amount; arid area (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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