Spectroscopy and Spectral Analysis, Volume. 41, Issue 11, 3518(2021)
Fluorescence Spectrum Characteristics of Fulvic Acid in Black Soil Under Different Ratios of Organic-Inorganic Fertilizers Combined Application
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 (Fmax) 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
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Yan LI, Yang BAI, Dan WEI, Wei WANG, Yu-mei LI, Hong XUE, Yu HU, Shan-shan CAI. Fluorescence Spectrum Characteristics of Fulvic Acid in Black Soil Under Different Ratios of Organic-Inorganic Fertilizers Combined Application[J]. Spectroscopy and Spectral Analysis, 2021, 41(11): 3518
Category: Orginal Article
Received: Dec. 7, 2020
Accepted: --
Published Online: Dec. 17, 2021
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