Distribution of chemical compounds in different soil layers of rhododendron forest

Li, C.C.; Quan, Wenxuan; Qian, C.Y.; Wu, Y.Y.

doi:10.26651/allelo.j/2019-48-2-1254

Cited by 3 publications

(5 citation statements)

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“…Litter decomposition is a significant source of phenolic acids (de Las Heras et al, 2020). A previous study found that the phenolic acid content was significantly higher in the litter layer than in the humus and soil layers (Li et al, 2019). The results of this study are basically consistent with these findings.…”

Section: Discussionsupporting

confidence: 90%

Distribution of six phenolic acids and soil nutrient relationships during litter decomposition in Rhododendron forests

Zhao

Lin

Quan

et al. 2023

Front. For. Glob. Change

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Litter decomposition is an essential process in nutrient cycling in terrestrial ecosystems. Phenolic acids have an allelopathic effect on the natural regeneration of rhododendron forests, which was recently observed in rhododendron forests in Southwest China. We investigated the distribution of phenolic acids and their relationship with soil nutrients during litter decomposition to provide a reference for the subsequent artificial management of rhododendron forests. High-performance liquid chromatography (HPLC) was used to analyze the contents of six phenolic acids in the litter layer, humus layer, and soil layer during litter decomposition. During the first 3 three months, the rapid decomposition of the litter from two early flowering rhododendron species released large amounts of phenolic acids, and the lower litter layer decomposed rapidly. In addition, the total phenolic acid content in the litter decreased by 257.60 μg/g (Rhododendron siderophyllum) and 53.12 μg/g (Rhododendron annae) in the first three 3 months. During subsequent litter decomposition, the protocatechuic acid content in the litters of Rhododendron siderophyllum ranged from 20.15 μg/g to 39.12 μg/g, and the ferulic acid content was 10.70 μg/g to –33.79 μg/g. The protocatechuic acid and ferulic acid contents in the litter of Rhododendron annae were in the ranges of 10.88—19.68 μg/g and 10.75—18.00 μg/g, respectively. The contents of these two phenolic acids and the trend of decomposition were different from those of gallic acid, chlorogenic acid, caffeic acid and syringic acid. The distribution of phenolic acids was influenced by soil organic matter (SOM), soil ammonium nitrogen (NH4+), soil nitrate nitrogen (NO3–) and soil available phosphorus (AP). The results indicate seasonal variations in phenolic acid release during litter decomposition. The amount of phenolic acid in the litter decreased after 18 months of decomposition, but it returned to the previous level in the soil and the humus after different trends. More research into the metabolism of phenolic acids is needed.

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Section: Discussionsupporting

confidence: 90%

Distribution of six phenolic acids and soil nutrient relationships during litter decomposition in Rhododendron forests

Zhao

Lin

Quan

et al. 2023

Front. For. Glob. Change

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“…LMWOAs are widespread in various parts of the forest. Oxalic, citric, lactic, formic, malonic, and succinic acid, as well as other LMWOAs have been identified in the roots, stems, leaves, litter, and humus of Acer rubrum L., Cryptomeria japonica , Pinus koraiensis, and other forest plants [ 16 , 27 ]. Our study showed that oxalic, tartaric, formic, malic, lactic, acetic, citric, and succinic acid were detected in the fresh leaves, litter, humus, and soils of the three species of rhododendron forests (RD, RA, and RI).…”

Section: Discussionmentioning

confidence: 99%

“…Earlier research results showed that the plants and soil microorganisms in the rhododendron forest community and some chemicals extracted from the litter inhibited seed germination and seedling growth [ 36 , 37 ]. Previous studies concluded that phenolic acids and alcohols were the main chemical substances in the litter layer [ 16 ]. Previous research reported that plants and their ectomycorrhizas affect the content of chemicals (oxalic, citric, malonic, succinic, acetic, formic, and lactic acid) in forest soil [ 38 ].…”

Section: Discussionmentioning

confidence: 99%

“…The annual mean rainfall is 1000–1100 mm, with a wet season from May to October and a dry season from November to April [ 20 ]. Baili Rhododendron National Forest Park contains more than 40 species of wild rhododendrons, and it has the largest native wild rhododendron forests in China and the world [ 16 ].…”

Section: Methodsmentioning

confidence: 99%

“…Plant allelopathy refers to plants that affect neighboring plants or themselves by releasing chemical substances into the environment, resulting in beneficial or harmful mutual effects [ 15 ]. Additionally, studies have shown that long-chain fatty acids and organic acids are the main chemical species in the humus and soil surface of wild rhododendron forests and may be one of the most important factors for the natural regeneration of the forest, single plant species, and reverse succession [ 16 ]. The interaction between organic acids and soil microorganisms enhances the absorption of nutrients by plants [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Variations of Low-Molecular-Weight Organic Acids in Three Evergreen Broadleaf Rhododendron Forests

Hao

Zhao

et al. 2023

Metabolites

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Low-molecular-weight organic acids (LMWOAs) are widely distributed in forests. Fresh leaves, litter, humus, and the topsoil layer of representative Rhododendron delavayi (RD), Rhododendron agastum (RA), and Rhododendron irroratum (RI) in the Baili Rhododendron National Forest Park were sampled to explore their seasonal changes. The contents of oxalic, tartaric, malic, citric, acetic, lactic, succinic, and formic acids in samples from different seasons were determined by high-performance liquid chromatography. The results showed that the composition and content of the LMWOAs in the fresh leaves, litter, humus, and topsoil layer of the rhododendrons were affected by the tree species, samples, and season. The main LMWOA was oxalic acid (the average content in the samples was 195.31 µg/g), followed by malic acid (the average content in the samples was 68.55 µg/g) and tartaric acid (the average content in the samples was 59.82 µg/g). Succinic acid had the lowest content; the average content in the samples was 18.40 µg/g. The LMWOAs of the RD were the highest (the average content in the samples was 517.42 µg/g), and the LMWOAs of the RI were the lowest (the average content in the samples was 445.18 µg/g). The LMWOAs in the three rhododendron forests were in the order of fresh leaves > litter > humus > soil layers. This study showed the seasonal distribution characteristics of LMWOAs in three evergreen broadleaf rhododendron forests, and the results provide a reference for ecosystem management and the protection of wild rhododendron forests.

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Allelopathic potential and allelochemical composition in different soil layers of Rhododendron delavayi forest, southwest China

Quan

Wang²,

Li³

et al. 2022

Front. Ecol. Evol.

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Forests habituated by Rhododendron delavayi often lack understory vegetation, which could possibly be a consequence of allelopathy. It is a phenomenon by virtue of which certain plant species produce allelochemicals that affect the growth and behavior of surrounding plants. To elucidate the allelopathic potential and allelochemicals present in the different layers of a R. delavayi forest, extracts obtained from three layers of the forest were used for seed germination bioassays and gas chromatography-mass spectrometry (GC–MS) analysis. Aqueous extracts of the litter and humus layers significantly inhibited the seed germination of R. delavayi, Festuca arundinacea, and Lolium perenne, with the litter layer causing the strongest inhibitory effect. A total of 26 allelochemicals were identified in the litter, humus, and soil layers by GC–MS analysis. The primary allelochemicals in the soil and humus layer were organic acids, while the main allelochemicals in the litter layer were phenolic acids. The redundancy analysis revealed the significance of total nitrogen (TN) and relative water content (RWC) in explaining the distribution of the allelochemicals. The results indicated that the litter layer exerted the maximum allelopathic effect due to presence of maximum amount of allelochemical especially the phenolic acids.

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Distribution of chemical compounds in different soil layers of rhododendron forest

Cited by 3 publications

References 0 publications

Distribution of six phenolic acids and soil nutrient relationships during litter decomposition in Rhododendron forests

Distribution of six phenolic acids and soil nutrient relationships during litter decomposition in Rhododendron forests

Seasonal Variations of Low-Molecular-Weight Organic Acids in Three Evergreen Broadleaf Rhododendron Forests

Allelopathic potential and allelochemical composition in different soil layers of Rhododendron delavayi forest, southwest China

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