文献类型： 外文期刊

作者： Li Hui ² ; Gao Qiang ¹ ; Wang Shuai ³ ; Zhu Ping ⁴ ; Zhang Jin-jing ¹ ; Zhao Yi-dong ⁵ ;

作者机构： 1.Jilin Agr Univ, Coll Resource & Environm Sci, Changchun 130118, Peoples R China

2.Dayun Biol Co Ltd, Baotou 014000, Inner Mongalia, Peoples R China

3.Jilin Agr Sci & Technol Coll, Coll Plant Sci, Changchun 132101, Jilin, Peoples R China

4.Jilin Acad Agr Sci, Inst Agr Resources & Environm, Changchun 130124, Peoples R China

5.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

关键词： XANES;Long-term fertilization;Black soil;Organic nitrogen functional group

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.589； 五年影响因子：0.504 ）

ISSN： 1000-0593

年卷期： 2015 年 35 卷 7 期

页码：

收录情况： SCI

摘要： Nitrogen (N) is a common limiting nutrient in crop production. The N content of soil has been used as an important soil fertility index. Organic N is the major form of N in soil. In most agricultural surface soils, more than 90% of total N occurs in organic forms. Therefore, understanding the compositional characteristics of soil organic N functional groups can provide the scientific basis for formulating the reasonable farmland management strategies. Synchrotron radiation soft X-ray absorption near-edge structure (N K-edge XANES) spectroscopy is the most powerful tool to characterize in situ organic N functional groups compositions in soil. However, to our most knowledge, no studies have been conducted to examine the organic N functional groups compositions of soil Using N K-edge XANES spectroscopy under long-term fertilization practices. Based on a long-term field experiment (started in 1990) in a black soil (Gongzhuling, Northeast China), we investigated the differences in organic N functional groups compositions in bulk soil and clay-size soil fraction among fertilization patterns using synchrotron-based N Kedge XANES spectroscopy. Composite soil samples (0 similar to 20 cm) were collected in 2008. The present study included six treatments: farmland fallow (FALL), no-fertilization control (CK), chemical nitrogen, phosphorus, and potassium fertilization (NPK), NPK in combination with organic manure (NPKM), 1. 5 times of NPKM (1. 5 NPKM), and NPK in combination with maize straw (NPKS). The results showed that N K-edge XANES spectra of all the treatments under study exhibited characteristic absorption peaks in the ranges of 401. 2 similar to 401. 6 and 402. 7 similar to 403. 1 eV, which were assigned as amides/amine-N and pyrrole-N, respectively. These characteristic absorption peaks were more obvious in clay-size soil fraction than in bulk soil. The results obtained from the semi-quantitative analysis of N K-edge XANES spectra indicated that the relative proportion of amides/amine-N was the highest in both bulk soil and clay-size soil fraction, and it was the most major forms in soil organic nitrogen functional groups. Compared with the FALL treatment, the relative proportion of amide/amine-N was lower whereas that of Pyrrole-N was higher in the CK treatment. In the treatments with Combined chemical fertilizers and organic manure, the relative proportion of amide/amine-N decreased with increasing application rates of organic manure, while that of Pyrrole-N had an opposite trend. In bulk soil, the relative proportion of amide/amine-N was the highest for the NPKS treatment than for the other treatments. On the other hand, the relative proportion of nitrile/aromatic-N was the highest for the Fallow treatment than for the other treatments in clay-size soil fraction. It is feasible to use N K-edge XANES spectroscopy for characterizing in situ the changes of organic N functional groups in soil under different fertilization practices.