文献类型： 外文期刊

第一作者： Xin Hong-juan

作者： Xin Hong-juan;Yang Dong-ling;Han Chao-qun;Gu Xue-qi;Liu Jin;Chen Yuan-quan;Sui Peng;Yang Jian-jun

作者机构：

关键词： Phosphorus; Molecular speciation; Solution P-31 NMR; Crop residues

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.609； 五年影响因子：0.516 ）

ISSN： 1000-0593

年卷期： 2022 年 42 卷 7 期

页码：

收录情况： SCI

摘要： The returning of crop residues to agricultural soils are of great significance to the development of Green Agriculture and soil fertility improvement. In China, there are various types of crop residues with high abundance. It is essential to characterize phosphorus (P) speciation in typical crop residues to predict the crop availability after returning them to the agricultural fields. To date, liquid-phase phosphorus-31 nuclear magnetic resonance (P-31-NMR) spectroscopy is a state-of-the-art technique for characterizing P species at the molecular level. However, there were limited investigations on the characterization of P speciation in crop residuals by P-31-NMR spectroscopy. Moreover, spectral peaks of different P forms, generally assigned based on the published literature, were significantly affected by sample properties (i. e pH) which resulted in large uncertainty and limited P forms to be identified. Therefore, with spiking experiments, this study used P-31-NMR spectroscopy to characterize molecular P species in different parts (straw, chaff and seed) of the typical crops, including corn, wheat, rice, cotton, soybean and peanut. The results showed that the total P content in all investigated crop residues was seed > chaff > straw. NaOH-EDTA extractable P ranged from 73% to 139% of total P, with an average value of 105%. Based on the spiking experiments, inorganic P forms (orthophosphate, pyrophosphate, tripolyphosphate) and organic P forms (phytate, alpha and beta-glycerophosphate, adenosine monophosphate) were detected in the investigated samples. Additionally, as one type of orthophosphate diesters, deoxyribonucleic acid was first detected in this study. In all investigated straw and chaff samples, the major P species were orthophosphates, comprising 49. 3%similar to 71. 6% of the NaOH-EDTA extracted P, while P in the seeds was mainly phytate (48. 5% 82. 9%). With correction for diester degradation, orthophosphate diester (17. 1%similar to 33. 5%) was more than orthophosphate monoester (9% similar to 13. 5%) in crop straw samples. In contrast, the orthophosphate monoester and orthophosphate diester percentages in chaff samples were 8. 8%similar to 23. 2% and 8. 8%similar to 24. 6% respectively, and orthophosphate monoester was the main component in seed samples (57. 6%similar to 82. 9%). It showed that the investigated crop residues, especially straw, probably release orthophosphate and orthophosphate diesters as labile P forms for subsequent crop uptake after returning to the soil. These results provide a significant scientific basis for crop residue returning and P fertilization management in agricultural lands.

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