Changes in Organic Carbon in Mineral Topsoil of a Formerly Cultivated Arenosol under Different Land Uses in Lithuania

Liudmila Tripolskaja, Asta Kazlauskaite-Jadzevice, Eugenija Baksiene and Almantas Razukas
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Liudmila Tripolskaja: Lithuanian Research Centre for Agriculture and Forestry, Vokė Branch, Žalioji 2, LT-02232 Vilnius, Lithuania
Asta Kazlauskaite-Jadzevice: Lithuanian Research Centre for Agriculture and Forestry, Vokė Branch, Žalioji 2, LT-02232 Vilnius, Lithuania
Eugenija Baksiene: Lithuanian Research Centre for Agriculture and Forestry, Vokė Branch, Žalioji 2, LT-02232 Vilnius, Lithuania
Almantas Razukas: Lithuanian Research Centre for Agriculture and Forestry, Vokė Branch, Žalioji 2, LT-02232 Vilnius, Lithuania

Agriculture, 2022, vol. 12, issue 4, 1-19

Abstract: This study aims to determine the differences in the organic carbon, humic acid (HA), and fulvic acid (FA) concentrations in the A and AB horizons, depending on land use, in order to determine the influence of the land use on the soil organic carbon (SOC) sequestration rate in the A horizon, and to assess the impact of the land use on the quality of the humic substances (HS) (the humification rate (HR) and the HA/FA ratio). On the basis of the data of 1995–2018, it would be expedient to convert cropland (CL) areas to fertilized managed grassland (MGfert) in order to increase the SOC accumulation (28%) in the Arenosol . In the unfertilized managed grassland (MGunfer) areas, the SOC accumulation in the A horizon was similar to that in the MGfert ( p > 0.05); however, significantly less (−45.0%) HAs were formed, the HR decreased 2.8%, and the HA/FA ratio was 1.12%. This means that less stable humic substances were formed in the MGunfer soil. In the Arenosol , the fastest SOC sequestration took place in the AL and PP areas, the annual SOC stocks increased by 393 and 504 kg ha −1 year −1 , respectively, and the HR increased to 19.1–21.3% (CLfert: 11.9%). However, these types of land use produce more FAs (14.5 and 32.5% more, respectively, compared to the MGfert, and 36.3 and 57.7% more, respectively, compared to the CLfert), which can lead to soil acidification and can accelerate eluvial processes. Because of the faster leaching of the FAs from the upper layers of the A horizon to the AB horizon, the humus type changes from humate–fulvate in the A horizon, to fulvate–humate in the AB horizon.

Keywords: humic acids; fulvic acids; humification rate; soil horizon (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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