Organic carbon preservation promoted by aromatic compound-iron complexes through manure fertilization in red soil

文献类型： 外文期刊

第一作者： Wen, Yunjie

作者： Wen, Yunjie;Bai, Lingyu;Wang, Yanan;Su, Shiming;Wu, Cuixia;Zeng, Xibai;Wen, Yunjie;Wang, Qi;Bai, Lingyu;Wen, Jiong;Wang, Yanan;Su, Shiming;Wu, Cuixia;Zeng, Xibai

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关键词： Hydrofluoric acid; Sequential density fractionation; Poorly crystalline mineral oxides; Stabilizing mechanism

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

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收录情况： SCI

摘要： Purpose This study was aimed at evaluating the effect of manure fertilization on organo-mineral complexes based on unfertilized (CK) and 5-year manure fertilization (M) in red soils (ultisols). Materials and methods Sequential density fractionation was adopted to obtain particular organic matter (POM, < 1.8 g cm(-3)) and mineral-associated organic matter (1.8-2.2 g cm(-3)(MOM1.8-2.2); 2.2-2.6 (MOM2.2-2.6); > 2.6 (MOM> 2.6)), which were demineralized by hydrofluoric acid (HF). The HF-dissolved organic carbon (OC) was identified as mineral bound OC, and was characterized by comparing the band area of Fourier transform infrared spectroscopy before and after 10% HF demineralization. Results and discussion Manure fertilization significantly increased the OC and nitrogen contents of bulk soil, POM, MOM1.8-2.2, and MOM2.2-2.6, but did not affect MOM> 2.6. About 82.9-86.1% soil OC was retained by MOM(1.8-2.2)and MOM(2.2-2.6)dominated with iron (Fe) and aluminum oxides and phyllosilicates, in which HF-dissolved OC was significantly positively correlated with poorly crystalline (Fe-o) (R-2= 0.61,P< 0.01) and organically complexed (Fe-p) Fe contents (R-2= 0.45,P< 0.05). Moreover, the Fe(o)and Fe(p)contents were higher in M than in CK (P< 0.05), and significantly negatively correlated with the reduction of aromatic C (M had more reduction than CK) following HF demineralization in MOM(1.8-2.2)and MOM2.2-2.6(P< 0.05), indicating Fe bound OC was mainly aromatic C. The quartz and feldspar-dominated MOM(> 2.6)was composed of aromatic C, amide N, and polysaccharides, not being affected by fertilization. Conclusions Our results suggested that manure fertilization promotes organo-mineral association, particularly for aromatic compound-Fe complexes, contributing to OC preservation in red soils.

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