Sequestration of Organic Carbon in Sod-Podzolic Sandy Loam Soil

• Published in: Russian agricultural sciences Vol. 49; no. 2; pp. 184 - 188
• Main Authors: Boitsova, L. V., Neprimerova, S. V., Zinchuk, E. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2023; Springer Nature B.V
• Subjects: Agricultural Soil Science and Agroecology; Agriculture; Biomedical and Life Sciences; Carbon; Centrifugation; Clay; Clay minerals; Clay soils; Cultivation; Feldspars; Growing season; Life Sciences; Loam; Loam soils; Moisture effects; Organic carbon; Organic compounds; Organic matter; Organic soils; Plant Biochemistry; Podzolic soils; Sandy loam; Sandy soils; Sod; Soil analysis; Soil moisture; Soil temperature; Total organic carbon; X ray analysis; X-ray analysis; degree of a cultivation state; clay fraction; enrichment coefficient
• ISSN: 1068-3674; 1934-8037
• DOI: 10.3103/S1068367423020039

This study was conducted to investigate sequestration of organic matter in the clay fraction of sod-podzolic sandy loam soil of various degrees of cultivation. The research focuses on sod-podzolic sandy loam soil of medium (MDC) and high (HDC) degrees of the cultivation state (Leningrad oblast) The organic matter was determined using the Tyurin method. The clay fraction of the soil (<1 μm) was separated by sedimentation and centrifugation. X-ray analysis of soil minerals in the clay fraction was performed using a DRON-ZM X-ray diffractometer, Cu K α tube, mode 30 mA, 30 kV, from 3.5 to 75 degrees, and goniometer rotation speed of 1° per min. A significantly larger ( p < 0.0001) amount of total organic carbon in the plough horizon of HDC soil of approximately 28 g/kg of the soil was recorded in May and August, which twice exceeded the content of total organic carbon in MDC soil. Significantly larger content of the carbon associated with the clay fraction (C cl ) during the growing season ( p < 0.01) was recorded from HDC soil, specifically, 82.33–97.51 g/kg of the fraction. The excess was 1.2–1.4-fold compared with the MDC variant. The highest coefficient of enrichment with organic matter of the clay fraction was observed in MDC soil, 4.08–4.79, whereas its value in HDC soil varied in the range of 2.95–3.69. The investigation demonstrated that dioctahedral micas and chlorite were largely involved in sequestration of organic compounds in MDC soil; significant positive correlational relations were established between their content and C cl ( r = 0.83). In HDC soil, a similar situation was observed for potassium feldspars ( r = 0.99). A significant relationship of a content of C cl with soil temperature r = (–0.84) and soil moisture r = (–0.91) was found for MDC soil. The MDC soil exhibited higher sequestration capacity compared to HDC soil overall.