Effects of organic fertilizer addition on dissolved organic carbon in coastal saline soils

FAN Zhixin, WANG Genmei, ZHANG Huanchao, CHEN Jie

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1) : 15-24.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1) : 15-24. DOI: 10.12302/j.issn.1000-2006.202012010

Effects of organic fertilizer addition on dissolved organic carbon in coastal saline soils

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Abstract

【Objective】 To establish a theoretical basis to improve coastal saline soil and its carbon sink function, this study investigated the effects of organic fertilizer on the dissolved organic carbon (DOC) content and component sources in coastal saline soil, alongside the stability of the soil carbon pool. 【Method】 Two types of saline soil with differing salinities (i.e., high and low salt content) in the Jiangsu coastal area, China, were selected to explore changes in soil DOC content and its ultraviolet-visible (UV-Vis) spectrum and three-dimensional (3D) fluorescence spectrum by UV-Vis spectroscopy and 3D fluorescence spectroscopy. This was carried out alongside parallel factor analysis following the addition of organic cow manure fertilizer.【Result】 The results showed that the DOC content and degree of DOC humification for soils treated with organic cow manure fertilizer increased significantly(P<0.05), compared with the control treated with no organic cow manure fertilizer. The extent of DOC humification in the soil samples collected on days 15 and 60 following the addition of cow manure from the high-salt soil was obvious higher than its low-salt counterpart. The DOC in soil was mainly sourced from the addition of organic cow manure fertilizer; following this, the 3D fluorescence spectrum showed that the DOC fulvic acid peak was clearer. The parallel factor analysis identified four fluorescence components in the soil DOC: (1) C1 was the exogenous short-wave humic-like component (including UV region fulvic-like acid and marine fulvic-like acid); (2) C2 was the exogenous humic-like component (including UV region fulvic-like acid and visible region fulvic-like acid); (3) C3 was the endogenous protein-like component (including tryosine-like acid and tryptophan-like acid); (4) C4 was the endogenous protein-like component (only tryptophan-like acid). The proportion of each component in the soil DOC varied with time. 【Conclusion】 This study demonstrated that the addition of organic cow manure fertilizer to coastal saline soil increased the degree of DOC humification and the proportion of humic-like components in soil, while it significantly reduced the proportion of ammonia-like components (P<0.05). This indicates that the organic cow manure fertilizer is conducive to the stability of the active carbon pool in saline soil. However, as many factors affect soil DOC, the effects of organic cow manure fertilizer on soil DOC may different in other areas.

Key words

organic fertilizer / coastal saline soil / dissolved organic carbon / ultraviolet-visible (UV-Vis) spectrum / three-dimensional (3D) fluorescence spectrum / parallel factor analysis

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FAN Zhixin , WANG Genmei , ZHANG Huanchao , et al. Effects of organic fertilizer addition on dissolved organic carbon in coastal saline soils[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2022, 46(1): 15-24 https://doi.org/10.12302/j.issn.1000-2006.202012010

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