Influence of Liming Intensity on Fractions of Humified Organic Carbon in Acid Soil: A Case Study

Ieva Mockeviciene, Danute Karcauskiene, Alvyra Slepetiene, Monika Vilkiene, Regina Repsiene, Zita Braziene and Olga Anne
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Ieva Mockeviciene: Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Akademija, 58344 Kedainiai, Lithuania
Danute Karcauskiene: Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Akademija, 58344 Kedainiai, Lithuania
Alvyra Slepetiene: Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Akademija, 58344 Kedainiai, Lithuania
Monika Vilkiene: Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Akademija, 58344 Kedainiai, Lithuania
Regina Repsiene: Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Akademija, 58344 Kedainiai, Lithuania
Zita Braziene: Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry, Akademija, 58344 Kedainiai, Lithuania
Olga Anne: Engineering Department, Marine Technology and Natural Sciences Faculty, Klaipeda University, 92295 Klaipeda, Lithuania

Sustainability, 2022, vol. 14, issue 9, 1-13

Abstract: Soil pH influences the composition and activities of microbial communities, which are driving the transformations of soil organic carbon (SOC). However, the effect of liming on SOC sequestration remains controversial. Evaluation of the effect of liming on SOC and humified carbon fractions was one of the most important tasks of this work. Studies were carried out in the long-term field experiment using slaked-lime rates of 0.5 or 2.0, depending on the soil hydrolytic acidity. It was determined that liming did not increase SOC content, but led to redistribution of SOC. The amount of mobile humic acids in the soil decreased while the intensity of liming increased. When liming at the 2.0 rate, the lowest HA1 level (0.251 g kg −1 C) and highest amount of HA2 (0.21 g kg −1 C) were found. It could be stated that soil liming, as a measure, allows the stabilization of HA and FA by the cation bridging mechanism. Liming resulted in slower mineralization of SOC and at the same time it also resulted in carbon sequestration in the form of valuable humic acids. An important consistent pattern of carbon transformation was identified in this study and can be applied in selecting of the most suitable combination of agricultural practices, promoting carbon sequestration and soil fertility.

Keywords: carbon sequestration; humic substances; qualitative characteristics of SOC; lime; acidification (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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