文献类型： 外文期刊

第一作者： Li Yan

作者： Li Yan;Bai Yang;Wei Dan;Hu Yu;Wei Dan;Wang Wei;Li Yu-mei;Xue Hong;Cai Shan-shan

作者机构：

关键词： Black soil; Organic-inorganic fertilizer combined application; Fulvic acid; Three-dimensional fluorescence spectrum

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： 2021 年 41 卷 11 期

页码：

收录情况： SCI

摘要： Fulvic acid (FA) is an important component of soil humus. As an intermediate substance in soil humification, the structural characteristics of FA play an important role in indicating the improvement of soil organic matter. The combined organic and inorganic fertilizers are an effective measure for soil fertility improvement, straw resource utilization and inorganic fertilizer reduction. In order to explore the effect of straw organic fertilizer instead of inorganic fertilizer (nitrogenous fertilizer) on soil FA in the black soil region of Heilongjiang Province, six treatments were set up, including no fertilization (CK), a single application of inorganic fertilizer (NPK) 25% of organic nitrogen fertilizer (NPKM1) , 50% (NPKM2) , 75% (NPKM3), and 100% (NPKM4). The contents of soil organic carbon (SOC) and FA were determined. The source of soil FA was characterized by fluorescence index (FI) and biological index (BIX) , and the degree of soil humification was analyzed by humification index (HIX). Three-dimensional fluorescence spectrum parallel factor analysis method was used to analyze the fluorescence components and maximum fluorescence intensity (F-max) of soil FA, and redundancy analysis (RDA) was used to explore the response relationships among fluorescence intensity, soil organic carbon and different treatments. The results showed that compared with NPK treatment, the contents of SOC and soil FA increased significantly in the treatments of combined application of organic and inorganic fertilizers, the greatest impact on NPKM2 treatment, SOC and soil FA content increased by 8. 06% and 13. 84%. Soil FA was affected by both autochthonous and terrestrial sources (FI > 1. 4, 0. 8 < BIX < 1. 0) , showing vital hummus and important neo-autochthonous sources characteristics (1. 5 < HIX < 3. 0) , and NPKM2 treatment had the highest degree of soil humification. Soil FA contained three fluorescent components ; fulvic-acid-like (fulvic-acid-like in ultraviolet region and fulvic-acid-like in visible light region, Ex/Em = 275 nm, 325 nm/410 nm) , humic-acid-like (Ex/Em = 250 nm, 350 nm/460 nm) and protein-like (short wave tryptophan and long wave tryptophan, Ex/Em = 275 nm, 225 nm/340 nm). With the increase of organic fertilizer ratio, the F-max values of fulvic-acid-like and humic-acid-like first increased and then decreased, and the F-max value of protein-like gradually decreased. The F-max values of fulvic-acid-like and humic-acid-like were the highest, and the relative percentage of humic-acid-like was the highest. The results of RDA showed that NPKM2 treatment had the greatest effect on the content of SOC and soil FA. Therefore, based on the analysis of soil FA fluorescence spectrum characteristics, in order to improve the content of soil organic matter, increase straw utilization rate and reduce the application of inorganic fertilizer, the treatment of straw organic fertilizer replacing inorganic nitrogen fertilizer by 50% was the best organic-inorganic fertilizer ratio.

分类号：