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Molecular-level insight into the effect of fertilization regimes on the chemodiversity of dissolved organic matter in tropical cropland

文献类型： 外文期刊

作者： Liu, Yuqin 1 ; Chen, Xin 1 ; Leng, Youfeng 1 ; Wang, Shuchang 1 ; Liu, Huiran 1 ; Zhang, Wen 1 ; Li, Wei 1 ; Li, Ning 1 ; Ning, Ziyu 1 ; Gao, Wenlong 1 ; Fan, Changhua 1 ; Wu, Xiaolong 1 ; Zhang, Meng 5 ; Li, Qinfen 1 ; Chen, Miao 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Low Carbon Green Agr Trop Reg China, Minist Agr & Rural Affairs, Haikou 571101, Peoples R China

2.Hainan Danzhou Trop Agroecosyst Natl Observat & Re, Danzhou 571737, Peoples R China

3.Hainan Key Lab Trop Ecocircular Agr, Haikou 571101, Peoples R China

4.Natl Longterm Expt Stn Agr Green Dev, Natl Agr Expt Stn Agr Environm, Danzhou 571737, Hainan, Peoples R China

5.Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China

6.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

关键词： Fertilization regimes; Latosol; Dissolved organic matter; Fluorescence properties; Molecular chemodiversity

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：7.7； 五年影响因子：7.7 ）

ISSN： 0013-9351

年卷期： 2024 年 262 卷

页码：

收录情况： SCI

摘要： Fertilization is a critical agronomic measure for croplands in tropical regions, owing to their low fertility. However, the effects of fertilization on the quantity and chemodiversity of latosolic dissolved organic matter (DOM) in tropical regions remain largely unknown. Therefore, in this study, the variations in latosol DOM concentrations and chemodiversity induced by inorganic fertilization and the co-application of inorganic fertilization with straw return, sheep manure, biochar, and vermicompost fertilizers at a molecular level were systematically investigated using multispectral techniques and ultrahigh-resolution mass spectrometry. In line with our expectations, the results showed that combined inorganic-organic fertilization improved soil quality by increasing soil organic carbon content compared to that under inorganic fertilization. However, as the most active and bioavailable organic carbon pool, dissolved organic carbonconcentrations between the fertilization treatments were not significantly different (p = 0.07). However, the dissolved organic carbon concentrations under combined inorganic-organic fertilization treatment (NPK plus straw return, 263.45 +/- 37.51 mg/kg) were lower than those under inorganic fertilization treatment (282.10 +/- 18.57 mg/kg). Spectral analysis showed that the DOM in the combined inorganic-organic fertilization treatments had a higher degree of humification and lower autogenetic contributions. Furthermore, Fourier transform ion cyclotron resonance mass spectrometry analysis indicated that the combined inorganic-organic fertilization increased the chemodiversity of latosolic DOM and promoted the production of large, oxidized, and stable molecules, including lignin, aromatic, and tannin compounds, which potentially benefits soil carbon sequestration in tropical regions. This study could provide a theoretical basis for elucidating on the potentially relevant ecological functions and environmental effects of DOM under fertilization regimes.

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