Characteristics of soil organic carbon fractions under different land use patterns in a tropical area
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SOILS, SEC 1 • SOIL ORGANIC MATTER DYNAMICS AND NUTRIENT CYCLING • RESEARCH ARTICLE
Characteristics of soil organic carbon fractions under different land use patterns in a tropical area Zhizhong Zhao 1
&
Zeyang Zhao 1
&
Bo Fu 2
&
Junguang Wang 1 & Wei Tang 1
Received: 18 December 2019 / Accepted: 18 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose To explore the effects of land use patterns on the accumulation of soil organic carbon (SOC) fractions in tropical areas, soil samples from paddy fields, abandoned croplands and vegetable-growing lands were collected at depths of 0–10, 10–20 and 20–30 cm in Hainan province, China. Methods The particulate organic carbon (POC) and mineral-associated organic carbon (MOC) concentrations in soil samples were determined, and their distribution characteristics were analysed. Results The results showed that MOC is the main component of SOC, with an average MOC/SOC ratio of 0.65. The POC and MOC concentrations showed a trend of paddy field > abandoned cropland > vegetable-growing land and gradually decreased with an increase in soil depth. The POC concentrations in the 0–10-cm soil of the paddy field and abandoned cropland were significantly higher than those of the 20–30-cm layers, and the MOC concentration in the 0–10-cm soil layer of the paddy field was significantly higher than that of the 10–20 and 20–30 cm layers. Correlation analysis showed that POC and MOC had a significant positive correlation with SOC, a significant negative correlation with soil particulate diameter and a weak correlation with pH and Eh. Conclusions Therefore, soil tillage and fertilisation under different land use patterns have a great influence on organic carbon fractions, and paddy fields have high carbon sequestration potential. Keywords Land use pattern . Mineral-associated organic carbon . Particulate organic carbon . Physicochemical properties . Tropical soil
1 Introduction The soil carbon cycle is a hot topic in the fields of terrestrial ecosystem carbon cycles and global change (Tu et al. 2018). Soil carbon is an important component of the terrestrial carbon pool (Sepahvand and Feizian 2016; Bai and Zhou 2020), including soil organic carbon (SOC) and soil inorganic carbon (SIC). The change in SIC is not obvious and has little Responsible editor: Heike Knicke * Zeyang Zhao [email protected] 1
College of Geography and Environmental Science, Hainan Normal University, Haikou, Hainan, China
2
Center for Clean Environment and Energy, Gold Coast Campus, Griffith University, Gold Coast, Queensland 4222, Australia
influence on the carbon cycle, while the proportion of SOC in the global carbon cycle is relatively large; its decomposition, transformation and accumulation have a great influence on plant growth and the global carbon balance (Zhou et al. 2019a). SOC is the core of soil nutrient transformation and the material basis of soil fertility. The SOC concentration has an impact on soil fertility, thus affecting the yield and quality of crops (Z
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