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• W4361010362 abstract "Soil organic carbon (SOC) and its stable isotope composition reflect key information about the carbon cycle in ecosystems. Studies of carbon fractions in oasis continuous cotton-cropped fields can elucidate the SOC stability mechanism under the action of the human-land relationship during the oasification of arid land, which is critical for understanding the carbon dynamics of terrestrial ecosystems in arid lands under global climate change. In this study, we investigated the Alar Reclamation Area on the northern edge of the Tarim Basin, Xinjiang Uygur Autonomous Region of China, in 2020. In original desert and oasis farmlands with different reclamation years, including 6, 10, 18, and 30 a, and different soil depths (0–20, 20–40, 40–60 cm), we analyzed the variations in SOC, very liable carbon (CVL), liable carbon (CL), less liable carbon (CLL), and non-liable carbon (CNL) using the method of spatial series. The differences in the stable carbon isotope ratio (δ13C) and beta (β) values reflecting the organic carbon decomposition rate were also determined during oasification. Through redundancy analysis, we derived and discussed the relationships among SOC, carbon fractions, δ13C, and other soil physicochemical properties, such as the soil water content (SWC), bulk density (BD), pH, total salt (TS), total nitrogen (TN), available phosphorus (AP), and available potassium (AK). The results showed that there were significant differences in SOC and carbon fractions of oasis farmlands with different reclamation years, and the highest SOC was observed at the oasis farmland with 30-a reclamation year. CVL, CL, CLL, and CNL showed significant changes among oasis farmlands with different reclamation years, and CVL had the largest variation range (0.40–4.92 g/kg) and accounted for the largest proportion in the organic carbon pool. The proportion of CNL in the organic carbon pool of the topsoil (0–20 cm) gradually increased. δ13C varied from –25.61‰ to –22.58‰, with the topsoil showing the most positive value at the oasis farmland with 10-a reclamation year; while the β value was the lowest at the oasis farmland with 6-a reclamation year and then increased significantly. Based on the redundancy analysis results, the soil physicochemical properties, such as TN, AP, AK, and pH, were significantly correlated with CL, and TN and AP were positively correlated with CVL. However, δ13C was not significantly influenced by soil physicochemical properties. Our analysis advances the understanding of SOC dynamics during oasification, revealing the risk of soil carbon loss and its contribution to terrestrial carbon accumulation in arid lands, which could be useful for the sustainable development of regional carbon resources and ecological protection in arid ecosystem." @default.
• W4361010362 created "2023-03-30" @default.
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• W4361010362 date "2023-03-01" @default.
• W4361010362 modified "2023-09-27" @default.
• W4361010362 title "Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land" @default.
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• W4361010362 doi "https://doi.org/10.1007/s40333-023-0093-5" @default.
• W4361010362 hasPublicationYear "2023" @default.
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