Long-term fertilization affects functional soil organic carbon protection mechanisms in a profile of Chinese loess plateau soil

文献类型： 外文期刊

第一作者： Shah, Syed Atizaz Ali

作者： Shah, Syed Atizaz Ali;Xu, Minggang;Abrar, Muhammad Mohsin;Mustafa, Adnan;Zhou, Wei;Nan, Sun;Fahad, Shah;Shah, Tufail;Shah, Syed Aizaz Ali;Yang, Xueyun;Zhang, Shulan;Shi, Weiqi

作者机构：

关键词： Manure fertilization; Loess plateau soil; Stabilization mechanisms; Subsoil; SOC fractionation

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2021 年 267 卷

页码：

收录情况： SCI

摘要： Crop productivity and soil health are limited by organic carbon (OC), however, the variations in the mechanisms of SOC preservation in a complete soil profile subjected to long-term fertilization remains unclear. The objective of the study was to examined the content and profile distribution of the distinctive SOC protection mechanisms on a complete profile (0-100 cm) of Eumorthic Anthrosols in Northwest China after 23 years of chemical and manure fertilization. The soil was fractionated by combined physical-chemical and density floatation techniques. Throughout the profile, significant variations were observed among fractions. In the topsoil (0-20 and 20-40 cm), mineral coupling with the fertilization of manure (MNPK) enhanced total SOC content and recorded for 29% of SOC in the 0-20 and 20-40 cm layers. Moreover, MNPK increased the SOC content of the unprotected cPOC fraction by 60.9% and 61.5% in the 0-20 and 20-40 cm layer, while SOC content was low in the subsoil layers (40-60, 60-80 and 80 -100 cm, respectively) compared with the control (C). The highest OC under MNPK in physically protected micro-aggregates (mu agg) (6.36 and 6.06 g C kg(-1)), and occluded particulate organic carbon (iPOC) (1.41 and 1.29 g C kg(-1)) was found in the topsoil layers. The unprotected cPOC fraction was the greatest C accumulating fraction in the topsoil layers, followed by mu agg and H-mu Silt fractions in the soil profile, implying that these fractions were the most sensitive to the fertilization treatments. Overall, the unprotected, physically protected, and physico-chemically protected fractions were the dominant fractions for the sequestration of carbon across fertilization treatments and soil layers. (C) 2020 Elsevier Ltd. All rights reserved.

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